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Patel BK, Ye F, Liyanage WLNC, Buchanan CC, Gilbert DA, Kolis JW, Sanjeewa LD. Large magnetic anisotropy of a decorated spin-chain system K 2Co 3(MoO 4) 3(OH) 2. Dalton Trans 2024; 53:6592-6600. [PMID: 38375683 DOI: 10.1039/d4dt00203b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2024]
Abstract
The magnetic structure of K2Co3(MoO4)3(OH)2 is studied in detail. The material has a half-sawtooth one-dimensional (1-D) structure containing two unique Co2+ ions, one in the chain backbone and one on the apex of the sawtooth creating a series of isosceles triangles along the b-axis. These triangles can be a source of magnetic frustration. The ability to grow large single crystals enables detailed magnetic measurements with the crystals oriented in a magnetic field along the respective axes. It has a Curie-Weiss temperature θCW of 5.3(2) K with an effective magnetic moment of 4.8(3)μB/Co. The material is highly anisotropic with a sharp antiferromagnetic ordering transition at 7 K with a metamagnetic transition at 2 kOe. Neutron diffraction was used to determine the magnetic structure and revealed a magnetic structure with canted spins along the backbone of the chain while spins along the sawtooth caps maintained a colinear orientation, arranging antiferromagnetically relative to the backbone spins. The parallel chains arrange antiferromagnetically relative to each other along the c-axis and ferromagnetically along the a-axis.
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Affiliation(s)
- Bhakti K Patel
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
| | - Feng Ye
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - W L N C Liyanage
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - C Charlotte Buchanan
- Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Dustin A Gilbert
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
- Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
| | - Liurukara D Sanjeewa
- University of Missouri Research Reactor (MURR), University of Missouri, Columbia, MO 65211, USA.
- Department of Chemistry, University of Missouri, Columbia, MO 65211, USA
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Sanjeewa LD, Ovidiu Garlea V, Taddei KM, Yin L, Xing J, Fishman RS, Parker DS, Sefat AS. NaCo 2(SeO 3) 2(OH): competing magnetic ground states of a new sawtooth structure with 3d 7 Co 2+ ions. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01072k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the high-pressure synthesis and a comprehensive study of NaCo2(SeO3)2(OH) sawtooth chain structure using bulk magnetic properties and neutron scattering.
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Affiliation(s)
- Liurukara D. Sanjeewa
- University of Missouri Research Reactor (MURR), Columbia, Missouri 65211, USA
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | - V. Ovidiu Garlea
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Keith M. Taddei
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Li Yin
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Jie Xing
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Randy S. Fishman
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - David S. Parker
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Athena S. Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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Yahne DR, Pereira D, Jaubert LDC, Sanjeewa LD, Powell M, Kolis JW, Xu G, Enjalran M, Gingras MJP, Ross KA. Understanding Reentrance in Frustrated Magnets: The Case of the Er_{2}Sn_{2}O_{7} Pyrochlore. Phys Rev Lett 2021; 127:277206. [PMID: 35061439 DOI: 10.1103/physrevlett.127.277206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 11/11/2021] [Indexed: 06/14/2023]
Abstract
Reentrance, the return of a system from an ordered phase to a previously encountered less-ordered one as a controlled parameter is continuously varied, is a recurring theme found in disparate physical systems, yet its microscopic cause is often not investigated thoroughly. Here, through detailed characterization and theoretical modeling, we uncover the microscopic mechanism behind reentrance in the strongly frustrated pyrochlore antiferromagnet Er_{2}Sn_{2}O_{7}. We use single crystal heat capacity measurements to expose that Er_{2}Sn_{2}O_{7} exhibits multiple instances of reentrance in its magnetic field B vs temperature T phase diagram for magnetic fields along three cubic high symmetry directions. Through classical Monte Carlo simulations, mean field theory, and classical linear spin-wave expansions, we argue that the origins of the multiple occurrences of reentrance observed in Er_{2}Sn_{2}O_{7} are linked to soft modes. These soft modes arise from phase competition and enhance thermal fluctuations that entropically stabilize a specific ordered phase, resulting in an increased transition temperature for certain field values and thus the reentrant behavior. Our work represents a detailed examination into the mechanisms responsible for reentrance in a frustrated magnet and may serve as a template for the interpretation of reentrant phenomena in other physical systems.
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Affiliation(s)
- D R Yahne
- Department of Physics, Colorado State University, 200 W. Lake Street, Fort Collins, Colorado 80523-1875, USA
| | - D Pereira
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - L D C Jaubert
- CNRS, Université de Bordeaux, LOMA, UMR 5798, 33400 Talence, France
| | - L D Sanjeewa
- Missouri Research Reactor, University of Missouri, Columbia, Missouri 65211, USA
- Department of Chemistry, University of Missouri, Columbia, Missouri 65211, USA
| | - M Powell
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, USA
| | - J W Kolis
- Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, USA
| | - Guangyong Xu
- NIST Center for Neutron Research, National Institutue of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - M Enjalran
- Department of Physics, Southern Connecticut State University, 501 Crescent Street, New Haven, Connecticut 06515-1355, USA
| | - M J P Gingras
- Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
- CIFAR, MaRS Centre, West Tower 661 University Avenue, Suite 505, Toronto, Ontario M5G 1M1, Canada
| | - K A Ross
- Department of Physics, Colorado State University, 200 W. Lake Street, Fort Collins, Colorado 80523-1875, USA
- CIFAR, MaRS Centre, West Tower 661 University Avenue, Suite 505, Toronto, Ontario M5G 1M1, Canada
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Ferreira T, Xing J, Sanjeewa LD, Sefat AS. Frustrated Magnetism in Triangular Lattice TlYbS 2 Crystals Grown via Molten Flux. Front Chem 2020; 8:127. [PMID: 32175311 PMCID: PMC7054481 DOI: 10.3389/fchem.2020.00127] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 02/12/2020] [Indexed: 11/23/2022] Open
Abstract
The triangular lattice compound TlYbS2 was prepared as large single crystals via a molten flux growth technique using sodium chloride. Anisotropic magnetic susceptibility measurements down to 0.4 K indicate a complete absence of long-range magnetic order. Despite this lack of long-range order, short-range antiferromagnetic interactions are evidenced through broad transitions, suggesting frustrated behavior. Variable magnetic field measurements reveal metamagnetic behavior at temperatures ≤2 K. Complex low temperature field-tunable magnetic behavior, in addition to no observable long-range order down to 0.4 K, suggest that TlYbS2 is a frustrated magnet and a possible quantum spin liquid candidate.
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Affiliation(s)
- Timothy Ferreira
- Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, TN, United States
| | - Jie Xing
- Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, TN, United States
| | - Liurukara D Sanjeewa
- Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, TN, United States
| | - Athena S Sefat
- Oak Ridge National Laboratory, Materials Science and Technology Division, Oak Ridge, TN, United States
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Sanjeewa LD, Garlea VO, Fishman RS, McGuire MA, Xing J, Cao H, Kolis JW, Sefat AS. Observation of a Large Magnetic Anisotropy and a Field-Induced Magnetic State in SrCo(VO 4)(OH): A Structure with a Quasi One-Dimensional Magnetic Chain. Inorg Chem 2020; 59:1029-1037. [PMID: 31845582 DOI: 10.1021/acs.inorgchem.9b02427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new member of the descloizite family, a cobalt vanadate, SrCo(VO4)(OH), has been synthesized as large single crystals using high-temperature and high-pressure hydrothermal methods. SrCo(VO4)(OH) crystallizes in the orthorhombic crystal system in space group P212121 with the following unit cell parameters: a = 6.0157(2) Å, b = 7.645(2) Å, c = 9.291(3) Å, V = 427.29(2) Å3, and Z = 4. It contains one-dimensional Co-O-Co chains of edge-sharing CoO6 octahedra along the a-axis connected to each other via VO4 tetrahedra along the b-axis forming a three-dimensional structure. The magnetic susceptibility of SrCo(VO4)(OH) indicates an antiferromagnetic transition at 10 K as well as unusually large spin orbit coupling. Single-crystal magnetic measurements in all three main crystallographic directions displayed a significant anisotropy in both temperature- and field-dependent data. Single-crystal neutron diffraction at 4 K was used to characterize the magnetically ordered state. The Co2+ magnetic spins are arranged in a staggered configuration along the chain direction, with a canting angle that follows the tipping of the CoO6 octahedra. The net magnetization along the chain direction, resulting in ferromagnetic coupling of the a-axis spin components in each chain, is compensated by an antiferromagnetic interaction between nearest neighbor chains. A metamagnetic transition appears in the isothermal magnetization data at 2 K along the chain direction, which seems to correspond to a co-alignment of the spin directions of the nearest neighbor chain. We propose a phenomenological spin Hamiltonian that describes the canted spin configuration of the ground state and the metamagnetic transition in SrCo(VO4)(OH).
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Affiliation(s)
- Liurukara D Sanjeewa
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States.,Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET) , Clemson University , Clemson , South Carolina 29634-0973 , United States
| | - V Ovidiu Garlea
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Randy S Fishman
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Michael A McGuire
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Jie Xing
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Huibo Cao
- Neutron Scattering Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET) , Clemson University , Clemson , South Carolina 29634-0973 , United States
| | - Athena S Sefat
- Materials Science and Technology Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
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Smith Pellizzeri TM, Sanjeewa LD, Pellizzeri S, McMillen CD, Garlea VO, Ye F, Sefat AS, Kolis JW. Single crystal neutron and magnetic measurements of Rb 2Mn 3(VO 4) 2CO 3 and K 2Co 3(VO 4) 2CO 3 with mixed honeycomb and triangular magnetic lattices. Dalton Trans 2020; 49:4323-4335. [PMID: 32162631 DOI: 10.1039/c9dt03389k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new alkali vanadate carbonates with divalent transition metals have been synthesized as large single crystals via a high-temperature (600 °C) hydrothermal technique. Compound I, Rb2Mn3(VO4)2CO3, crystallizes in the trigonal crystal system in the space group P3[combining macron]1c, and compound II, K2Co3(VO4)2CO3, crystallizes in the hexagonal space group P63/m. Both structures contain honeycomb layers and triangular lattices made from edge-sharing MO6 octahedra and MO5 trigonal bipyramids, respectively. The honeycomb and triangular layers are connected along the c-axis through tetrahedral [VO4] groups. The MO5 units are connected with each other by carbonate groups in the ab-plane by forming a triangular magnetic lattice. The difference in space groups between I and II was also investigated with Density Functional Theory (DFT) calculations. Single crystal magnetic characterization of I indicates three magnetic transitions at 77 K, 2.3 K, and 1.5 K. The corresponding magnetic structures for each magnetic transition of I were determined using single crystal neutron diffraction. At 77 K the compound orders in the MnO6-honeycomb layer in a Néel-type antiferromagnetic orientation while the MnO5 triangular lattice ordered below 2.3 K in a colinear 'up-up-down' fashion, followed by a planar 'Y' type magnetic structure. K2Co3(VO4)2CO3 (II) exhibits a canted antiferromagnetic ordering below TN = 8 K. The Curie-Weiss fit (200-350 K) gives a Curie-Weiss temperature of -42 K suggesting a dominant antiferromagnetic coupling in the Co2+ magnetic sublattices.
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Affiliation(s)
- Tiffany M Smith Pellizzeri
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA. and Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, IL 61920, USA
| | - Liurukara D Sanjeewa
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Steven Pellizzeri
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA. and Department of Chemistry and Biochemistry, Eastern Illinois University, Charleston, IL 61920, USA
| | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA.
| | - V Ovidiu Garlea
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Feng Ye
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Athena S Sefat
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA.
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Kolambage MT, McMillen CD, McGuire MA, Sanjeewa LD, Ivey K, Wen Y, Chumanov G, Kolis JW. Hydrothermal synthesis of lanthanide rhenium oxides: Structures and magnetism of Ln2Re2O7(OH) (Ln = Pr, Nd) and Ln4Re2O11 (Ln = Eu, Tb). J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.03.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sanjeewa LD, Garlea VO, McGuire MA, McMillen CD, Kolis JW. Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices. Inorg Chem 2019; 58:2813-2821. [PMID: 30730713 DOI: 10.1021/acs.inorgchem.8b03418] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The magnetic properties are reported for three members of the glaserite series of compounds, Na2BaM(VO4)2, M = Mn, Mn0.6Co0.4, and Co. Large single crystals are grown using a high-temperature hydrothermal synthesis method. This structure type exhibits a triangular magnetic lattice in which M2+O6 octahedra are interconnected with nonmagnetic (VO4)3- groups. All the structures crystallize at room temperature with rigid trigonal symmetry (space group P3̅ m1); however, at lower temperatures both Na2BaMn(VO4)2 and Na2BaMn0.6Co0.4(VO4)2 undergo a structural transition to lower symmetry (monoclinic, C2/ c). The bulk magnetic measurements indicate that Mn- and Co-structures are antiferromagnetic and ferromagnetic, respectively. Na2BaMn0.6Co0.4(VO4)2 does not show any long-range ordering down to 0.5 K, although a broad heat capacity anomaly near 1.2 K suggests short-range magnetic order or freezing into a spin-glass-like state related to the chemical disorder and resulting competing magnetic interactions. The magnetic structures of Na2BaMn(VO4)2 and Na2BaCo(VO4)2 were determined using neutron powder diffraction. At zero magnetic field, Na2BaMn(VO4)2 possesses an antiferromagnetic structure with the moments ordered in a Néel-type arrangement and aligned along the C4 axis of the octahedra. Under applied magnetic field at 0.3 K, the evolution of the magnetic structure toward a fully polarized state is observed. Na2BaCo(VO4)2 represents a ferromagnetic (FM) magnetic structure with Co moments aligned parallel to the c-axis direction. The relationships between these structures and magnetic properties are discussed.
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Affiliation(s)
- Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET) , Clemson University , Clemson , South Carolina 29634-0973 , United States
| | | | | | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET) , Clemson University , Clemson , South Carolina 29634-0973 , United States
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET) , Clemson University , Clemson , South Carolina 29634-0973 , United States
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Sanjeewa LD, Fulle K, McMillen CD, Kolis JW. Hydrothermal synthesis and structural characterization of several complex rare earth tantalates: Ln2TaO5(OH) (Ln = La, Pr) and Ln3Ta2O9(OH) (Ln = Pr, Nd). Dalton Trans 2019; 48:7704-7713. [DOI: 10.1039/c9dt00059c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New structure types Ln2TaO5(OH) and Ln3Ta2O9(OH) are prepared via hydrothermal synthesis from refractory oxide precursors.
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Affiliation(s)
- Liurukara D. Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET)
- Clemson University
- Clemson
- USA
| | - Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET)
- Clemson University
- Clemson
- USA
| | - Colin D. McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET)
- Clemson University
- Clemson
- USA
| | - Joseph W. Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET)
- Clemson University
- Clemson
- USA
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10
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Sanjeewa LD, Ross KA, Sarkis CL, Nair HS, McMillen CD, Kolis JW. Single Crystals of Cubic Rare-Earth Pyrochlore Germanates: RE 2Ge 2O 7 (RE = Yb and Lu) Grown by a High-Temperature Hydrothermal Technique. Inorg Chem 2018; 57:12456-12460. [PMID: 30253103 DOI: 10.1021/acs.inorgchem.8b01810] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Large single crystals of Yb2Ge2O7 in the cubic Fd3̅ m space group, are synthesized and characterized from a high-temperature hydrothermal method (650°C/200 MPa in 1 M KF). The cubic phase displays spin frustration and possibly nonclassical quantum-spin behavior at low temperature. This is the first report of single crystals of this important phase of size and quality suitable for single-crystal neutron diffraction.
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Affiliation(s)
- Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies , Clemson University , Clemson , South Carolina 29634-0973 , United States.,Materials Science and Technology Division and Quantum Condensed Matter Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States
| | - Kate A Ross
- Colorado State University , Fort Collins , Colorado 80523 , United States.,Quantum Materials Program , Canadian Institute for Advanced Research (CIFAR) , Toronto , Ontario M5G 1Z8 , Canada
| | - Colin L Sarkis
- Colorado State University , Fort Collins , Colorado 80523 , United States
| | | | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies , Clemson University , Clemson , South Carolina 29634-0973 , United States
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies , Clemson University , Clemson , South Carolina 29634-0973 , United States
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Fulle K, Sanjeewa LD, McMillen CD, Kolis JW. High temperature hydrothermal synthesis of rare-earth titanates: synthesis and structure of RE 5Ti 4O 15(OH) (RE = La, Er), Sm 3TiO 5(OH) 3, RE 5Ti 2O 11(OH) (RE = Tm-Lu) and Ce 2Ti 4O 11. Dalton Trans 2018; 47:6754-6762. [PMID: 29717317 DOI: 10.1039/c7dt04810f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of rare-earth oxides with TiO2 were performed in high temperature (650-700 °C) hydrothermal fluids. Two different mineralizer fluids were examined, 20 M KOH and 30 M CsF, and their respective products analyzed. When concentrated KOH fluids were used, single crystals of a variety of new OH- containing species were isolated and structurally characterized: RE5Ti4O15(OH) (RE = La, Er) I, Sm3TiO5(OH)3II and RE5Ti2O11(OH) (RE = Tm-Lu) III. La5Ti4O15(OH) I crystallizes in the orthorhombic space group Pnnm with unit cell dimensions of a = 30.5152(12) Å, b = 5.5832(2) Å, c = 7.7590(3) Å and V = 1321.92(9) Å3, Z = 4. Sm3TiO5(OH)3II crystallizes in the monoclinic space group P21/m with unit cell parameters of a = 5.6066(2) Å, b = 10.4622(4) Å, c = 6.1258(2) Å and β = 104.7390(10)°, V = 347.50(2) Å3, Z = 2. Lu5Ti2O11(OH) III crystallizes in the monoclinic space group C2/m with unit cell dimensions of a = 12.1252(9) Å, b = 5.8243(4) Å, c = 7.0407(5) Å, β = 106.939(3)° and V = 475.65(6) Å3, Z = 2. When concentrated fluoride solutions are used, mostly RE2Ti2O7 type compounds were isolated in either cubic or monoclinic phases. In the case of cerium, Ce2Ti4O11IV was isolated that crystallizes in the monoclinic space group C2/c with unit cell parameters of a = 13.6875(7) Å, b = 5.0955(3) Å, c = 12.8592(7) Å, β = 108.964(2)° and V = 848.18(8) Å3, Z = 4. The synthesis, structural characterization, and supporting characterization are reported for all compounds. The work highlights the complementary nature of hydroxide and fluoride fluids in studying the reactivity of refractory oxides.
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Affiliation(s)
- Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, USA.
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12
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Sanjeewa LD, Garlea VO, McGuire MA, Frontzek M, McMillen CD, Fulle K, Kolis JW. Investigation of a Structural Phase Transition and Magnetic Structure of Na 2BaFe(VO 4) 2: A Triangular Magnetic Lattice with a Ferromagnetic Ground State. Inorg Chem 2017; 56:14842-14849. [PMID: 29215870 DOI: 10.1021/acs.inorgchem.7b02024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural and magnetic properties of a glaserite-type Na2BaFe(VO4)2 compound, featuring a triangular magnetic lattice of Fe2+ (S = 2), are reported. Temperature dependent X-ray single crystal studies indicate that at room temperature the system adopts a trigonal P3̅m1 structure and undergoes a structural phase transition to a C2/c monoclinic phase slightly below room temperature (Ts = 288 K). This structural transition involves a tilting of Fe-O-V bond angles and strongly influences the magnetic correlation within the Fe triangular lattice. The magnetic susceptibility measurements reveal a ferromagnetic transition near 7 K. Single crystal neutron diffraction confirms the structural distortion and the ferromagnetic spin ordering in Na2BaFe(VO4)2. The magnetic structure of the ordered state is modeled in the magnetic space group C2'/c' that implies a ferromagnetic order of the a and c moment components and antiferromagnetic arrangement for the b components. Overall, the Fe magnetic moments form ferromagnetic layers that are stacked along the c-axis, where the spins point along one of the (111) facets of the FeO6 octahedron.
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Affiliation(s)
- Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Vasile O Garlea
- Neutron Scattering Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Michael A McGuire
- Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Matthias Frontzek
- Neutron Scattering Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University , Clemson, South Carolina 29634-0973, United States
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Fulle K, Sanjeewa LD, McMillen CD, Kolis JW. Crystal chemistry and the role of ionic radius in rare earth tetrasilicates: Ba 2RE 2Si 4O 12F 2 (RE = Er 3+-Lu 3+) and Ba 2RE 2Si 4O 13 (RE = La 3+-Ho 3+). Acta Crystallogr B Struct Sci Cryst Eng Mater 2017; 73:907-915. [PMID: 28980996 DOI: 10.1107/s2052520617009544] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 06/27/2017] [Indexed: 06/07/2023]
Abstract
Structural variations across a series of barium rare earth (RE) tetrasilicates are studied. Two different formulas are observed, namely those of a new cyclo-silicate fluoride, BaRE2Si4O12F2 (RE = Er3+-Lu3+) and new compounds in the Ba2RE2Si4O13 (RE = La3+-Ho3+) family, covering the whole range of ionic radii for the rare earth ions. The Ba2RE2Si4O13 series is further subdivided into two polymorphs, also showing a dependence on rare earth ionic radius (space group P{\overline 1} for La3+-Nd3+, and space group C2/c for Sm3+-Ho3+). Two of the structure types identified are based on dinuclear rare earth units that differ in their crystal chemistries, particularly with respect to the role of fluorine as a structural director. The broad study of rare earth ions provides greater insight into understanding structural variations within silicate frameworks and the nature of f-block incorporation in oxyanion frameworks. The single crystals are grown from high-temperature (ca 953 K) hydrothermal fluids, demonstrating the versatility of the technique to access new phases containing recalcitrant rare earth oxides, enabling the study of structural trends.
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Affiliation(s)
- Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
| | - Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
| | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634-0973, USA
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14
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Fulle K, Sanjeewa LD, McMillen CD, Wen Y, Rajamanthrilage AC, Anker JN, Chumanov G, Kolis JW. One-Pot Hydrothermal Synthesis of Tb III13(GeO 4) 6O 7(OH) and K 2Tb IVGe 2O 7: Preparation of a Stable Terbium(4+) Complex. Inorg Chem 2017; 56:6044-6047. [PMID: 28537716 DOI: 10.1021/acs.inorgchem.7b00821] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two terbium germanates have been synthesized via high-temperature and high-pressure hydrothermal synthesis with 20 M KOH as a mineralizer using Tb4O7 as a starting material. Tb13(GeO4)6O7(OH) crystallizes in trigonal space group R3̅, is built up of isolated GeO4 units, and contains a complex arrangement of terbium oxide polyhedra. K2TbGe2O7 is a terbium(4+) pyrogermanate that is isostructural with K2ZrGe2O7 and displays a rare stable Tb4+ oxidation state in the solid state.
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Affiliation(s)
- Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Yimei Wen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Apeksha C Rajamanthrilage
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Jeffrey N Anker
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - George Chumanov
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies, Clemson University , Clemson, South Carolina 29634-0973, United States
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Sanjeewa LD, McMillen CD, McGuire MA, Kolis JW. Manganese Vanadate Chemistry in Hydrothermal BaF2 Brines: Ba3Mn2(V2O7)2F2 and Ba7Mn8O2(VO4)2F23. Inorg Chem 2016; 55:12512-12515. [DOI: 10.1021/acs.inorgchem.6b02355] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Liurukara D. Sanjeewa
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Colin D. McMillen
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Michael A. McGuire
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Joseph W. Kolis
- Department of Chemistry and Center for Optical Materials
Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634-0973, United States
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16
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Maschmeyer EM, Sanjeewa LD, Ranmohotti KGS. Crystal structure of BaMnB 2O 5 containing structurally isolated manganese oxide sheets. Acta Crystallogr E Crystallogr Commun 2016; 72:1315-1320. [PMID: 27920925 PMCID: PMC5120715 DOI: 10.1107/s2056989016013074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Accepted: 08/12/2016] [Indexed: 11/29/2022]
Abstract
The structure of BaMnB2O5 is characterized by infinite sheets of B2O5 units and Mn2O8 dimers of edge-sharing MnO5 square pyramids while Ba2+ cations interleave successive sheets. In an attempt to search for mixed alkaline-earth and transition metal pyroborates, the title compound, barium manganese(II) pyroborate, has been synthesized by employing a flux method. The structure of BaMnB2O5 is composed of MnO5 square pyramids that form Mn2O8 dimers by edge-sharing and of pyroborate units ([B2O5]4−) that are composed of two corner-sharing trigonal–planar BO3 units. These building blocks share corners to form ∞2[MnB2O5]2− layers extending parallel to (100). The Ba2+ cations reside in the gap between two manganese pyroborate slabs with a coordination number of nine. The title compound forms an interesting spiral framework propagating along the 21 screw axis. The structure is characterized by two alternating layers, which is relatively rare among known transition-metal-based pyroborate compounds.
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Affiliation(s)
- Elizabeth M Maschmeyer
- Division of Chemistry and Biological Sciences, Governors State University, 1 University Parkway, University Park, IL 60484-0975, USA
| | | | - Kulugammana G S Ranmohotti
- Division of Chemistry and Biological Sciences, Governors State University, 1 University Parkway, University Park, IL 60484-0975, USA
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17
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Sanjeewa LD, McGuire MA, Smith Pellizzeri TM, McMillen CD, Ovidiu Garlea V, Willett D, Chumanov G, Kolis JW. Synthesis and characterization of new fluoride-containing manganese vanadates A2Mn2V2O7F2 (A=Rb, Cs) and Mn2VO4F. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2016.05.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Sanjeewa LD, McMillen CD, Willett D, Chumanov G, Kolis JW. Hydrothermal synthesis of single crystals of transition metal vanadates in the glaserite phase. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.07.039] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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19
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Mohana M, Muthiah PT, Sanjeewa LD, McMillen CD. Hydrogen-bonding patterns in 5-fluoro-cytosine-melamine co-crystal (4/1). Acta Crystallogr E Crystallogr Commun 2016; 72:552-5. [PMID: 27375887 PMCID: PMC4910324 DOI: 10.1107/s205698901600476x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 03/21/2016] [Indexed: 11/10/2022]
Abstract
The asymmetric unit of the title compound, 4C4H4FN3O·C3H6N6, comprises of two independent 5-fluoro-cytosine (5FC) mol-ecules (A and B) and one half-mol-ecule of melamine (M). The other half of the melamine mol-ecule is generated by a twofold axis. 5FC mol-ecules A and B are linked through two different homosynthons [R 2 (2)(8) ring motif]; one is formed via a pair of N-H⋯O hydrogen bonds and the second via a pair of N-H⋯N hydrogen bonds. In addition to this pairing, the O atoms of 5FC mol-ecules A and B inter-act with the N2 amino group on both sides of the melamine mol-ecule, forming a DDAA array of quadruple hydrogen bonds and generating a supra-molecular pattern. The 5FC (mol-ecules A and B) and two melamine mol-ecules inter-act via N-H⋯O, N-H⋯N and N-H⋯O, N-H⋯N, C-H⋯F hydrogen bonds forming R 6 (6)(24) and R 4 (4)(15) ring motifs. The crystal structure is further strengthened by C-H⋯F, C-F⋯π and π-π stacking inter-actions.
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Affiliation(s)
- Marimuthu Mohana
- School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India
| | | | - Liurukara D. Sanjeewa
- Department of Chemistry, Clemson University, H. L. Hunter Laboratories, Clemson, SC 29634, USA
| | - Colin D. McMillen
- Department of Chemistry, Clemson University, H. L. Hunter Laboratories, Clemson, SC 29634, USA
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McMillen CD, Comer S, Fulle K, Sanjeewa LD, Kolis JW. Crystal chemistry of hydrothermally grown ternary alkali rare earth fluorides. Acta Crystallogr B Struct Sci Cryst Eng Mater 2015; 71:768-76. [PMID: 26634734 DOI: 10.1107/s2052520615017916] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/24/2015] [Indexed: 11/10/2022]
Abstract
The structural variations of several alkali metal rare earth fluoride single crystals are summarized. Two different stoichiometric formulations are considered, namely those of ARE2F7 and ARE3F10 (A = K, Rb, Cs; RE = Y, La-Lu), over a wide range of ionic radii of both the alkali and rare earth (RE) ions. Previously reported and several new single-crystal structures are considered. The new single crystals are grown using hydrothermal methods and the structures are compared with literature reports of structures grown from both melts and hydrothermal fluids. The data reported here are combined with the literature data to gain a greater understanding of structural subtleties surrounding these systems. The work underscores the importance of the size of the cations to the observed structure type and also introduces synthetic technique as a contributor to the same. New insights based on single-crystal structure analysis in the work introduce a new disordered structure type in the case of ARE2F7, and examine the trends and boundaries of the ARE3F10 stoichiometry. Such fundamental structural information is useful in understanding the potential applications of these compounds as optical materials.
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Affiliation(s)
- Colin D McMillen
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Sara Comer
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Kyle Fulle
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Liurukara D Sanjeewa
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Joseph W Kolis
- Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA
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21
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Sanjeewa LD, McGuire MA, Garlea VO, Hu L, Chumanov G, McMillen CD, Kolis JW. Hydrothermal Synthesis and Characterization of Novel Brackebuschite-Type Transition Metal Vanadates: Ba2M(VO4)2(OH), M = V3+, Mn3+, and Fe3+, with Interesting Jahn–Teller and Spin-Liquid Behavior. Inorg Chem 2015; 54:7014-20. [DOI: 10.1021/acs.inorgchem.5b01037] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liurukara D. Sanjeewa
- Department
of Chemistry and Center for Optical Materials Science and Engineering
Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, United States
| | | | | | - Longyu Hu
- Department
of Chemistry and Center for Optical Materials Science and Engineering
Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, United States
| | - George Chumanov
- Department
of Chemistry and Center for Optical Materials Science and Engineering
Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Colin D. McMillen
- Department
of Chemistry and Center for Optical Materials Science and Engineering
Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, United States
| | - Joseph W. Kolis
- Department
of Chemistry and Center for Optical Materials Science and Engineering
Technologies (COMSET), Clemson University, Clemson, South Carolina 29634-0973, United States
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22
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Chen H, Qi B, Moore T, Wang F, Colvin DC, Sanjeewa LD, Gore JC, Hwu SJ, Mefford OT, Alexis F, Anker JN. Multifunctional yolk-in-shell nanoparticles for pH-triggered drug release and imaging. Small 2014; 10:3364-70. [PMID: 24753264 PMCID: PMC4474407 DOI: 10.1002/smll.201303769] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 03/23/2014] [Indexed: 05/06/2023]
Abstract
Multifunctional nanoparticles are synthesized for both pH-triggered drug release and imaging with radioluminescence, upconversion luminescent, and magnetic resonance imaging (MRI). The particles have a yolk-in-shell morphology, with a radioluminescent core, an upconverting shell, and a hollow region between the core and shell for loading drugs. They are synthesized by controlled encapsulation of a radioluminescent nanophosphor yolk in a silica shell, partial etching of the yolk in acid, and encapsulation of the silica with an upconverting luminescent shell. Metroxantrone, a chemotherapy drug, was loaded into the hollow space between X-ray phosphor yolk and up-conversion phosphor shell through pores in the shell. To encapsulate the drug and control the release rate, the nanoparticles are coated with pH-responsive biocompatible polyelectrolyte layers of charged hyaluronic acid sodium salt and chitosan. The nanophosphors display bright luminescence under X-ray, blue light (480 nm), and near infrared light (980 nm). They also served as T1 and T2 MRI contrast agents with relaxivities of 3.5 mM(-1) s(-1) (r1 ) and 64 mM(-1) s(-1) (r2 ). These multifunctional nanocapsules have applications in controlled drug delivery and multimodal imaging.
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Affiliation(s)
- Hongyu Chen
- Department of Chemistry, Center for optical materials science and engineering (COMSET), and environmental toxicology program, Clemson University, Clemson SC, 29634, USA
| | - Bin Qi
- Department of Materials Science Engineering, Center for optical materials science and engineering (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Thomas Moore
- Department of Bioengineering, 301 Rhodes Research Center, Clemson, SC 29634, USA
| | - Fenglin Wang
- Department of Chemistry, Center for optical materials science and engineering (COMSET), and environmental toxicology program, Clemson University, Clemson SC, 29634, USA
| | - Daniel C. Colvin
- Vanderbilt University Medical Center, AAA 3107 MCN, Nashville, TN 37232, USA
| | | | - John C. Gore
- Vanderbilt University Medical Center, AAA 3107 MCN, Nashville, TN 37232, USA
| | - Shiou-Jyh Hwu
- Department of Chemistry, Clemson University, Clemson SC, 29634, USA
| | - O. Thompson Mefford
- Department of Materials Science Engineering, Center for optical materials science and engineering (COMSET), Clemson University, Clemson, SC 29634, USA
| | - Frank Alexis
- Department of Bioengineering, 301 Rhodes Research Center, Clemson, SC 29634, USA
| | - Jeffrey N. Anker
- Department of Chemistry, Center for optical materials science and engineering (COMSET), and environmental toxicology program, Clemson University, Clemson SC, 29634, USA
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Sanjeewa LD, Palmer West J, Hwu SJ. Synthesis and structure of a new family of 3d–4f heterometallic compounds Rb7LnFe6O2(PO4)8 (Ln=Sm, Eu, Gd, Dy): Magnetic properties of the Sm-, Gd-, Dy-derivatives. J SOLID STATE CHEM 2012. [DOI: 10.1016/j.jssc.2012.04.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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