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Zhang X, Bo T, Huang ZW, Zhou ZH, Hu KQ, Shi WQ, Mei L. Exploring the Valence Diversity of Uranium by Flux Growth of Uranium Silicate under Inert Atmosphere. Inorg Chem 2024; 63:5281-5293. [PMID: 38430109 DOI: 10.1021/acs.inorgchem.4c00497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2024]
Abstract
The attributes of good solubility and the redox-neutral nature of molten salt fluxes enable them to be useful for the synthesis of novel crystalline actinide compounds. In this work, a flux growth method under an inert atmosphere is proposed to explore the valence diversity of uranium, and a series of five uranium silicate structures, [K3Cl][(UVIO2)(Si4O10)] (1), Cs3[(UVO2)(Si4O10)] (2), K2[UIV(Si2O7)] (3), K8[(UVIO2)(UVO2)2(Si8O22)] (4), and Cs6[UIV(UVO)2(Si12O32)] (5), were synthesized using different metal halide salt and feeding U/Si ratios. Crystal structure analysis reveals that the utilization of argon atmosphere that helps to avoid possible oxidation of low-valence uranium generates a variety of oxidation states of uranium including U(VI), U(V), U(IV), mixed-valence U(V) and U(VI), and mixed-valence U(IV) and U(V). Characterization of physicochemical properties of representative compounds shows that all these uranium silicate compounds have bandgaps among the range of 2.0-3.4 eV, and mixed-valence uranium silicate compounds have relatively narrower bandgaps. Density functional theory calculations on formation enthalpies, lattice energies, and bandgaps of all five compounds were also performed to provide more structural information about these uranium silicates. This work enriches the library of variable-valence uranium silicate compounds and provides a feasible way to produce novel actinide compounds with intriguing properties through the flux growth method that might show potential application in relevant fields such as storage media for nuclear waste.
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Affiliation(s)
- Xu Zhang
- College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Tao Bo
- Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Zhi-Wei Huang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Heng Zhou
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Kong-Qiu Hu
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Wei-Qun Shi
- College of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Mei
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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2
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Rießbeck KM, Wimmer DS, Seibald M, Baumann D, Wurst K, Heymann G, Huppertz H. Polymorphism and polymorph-dependent luminescence properties of the first lithium oxonitridolithosilicate Li 3SiNO 2:Eu 2. Dalton Trans 2023; 52:4900-4910. [PMID: 36943330 DOI: 10.1039/d2dt03921d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
Building on studies of monoclinic Li3SiNO2, a polymorph, β-Li3SiNO2, with a previously unknown structure type was synthesized. The β-phase crystallizes in the orthorhombic space group Pbca (no. 61) with lattice parameters of a = 18.736(2), b = 11.1267(5), c = 5.0897(3) Å, and a cell volume of V = 1057.2(1) Å3. Using high-temperature solid-state reactions in sealed tantalum tubes, it was possible to obtain high purity samples (<5 wt% of side phase LiSi2N3 according to Rietveld analysis) containing exclusively one or the other polymorph, depending solely on the cooling rate. In contrast to the monoclinic phase, orthorhombic β-Li3SiNO2 additionally contains a third layer and shows a layer-sequence of the type ABCB. Doped with the activator ion Eu2+, the new polymorph exhibits an intense yellow emission (λmax = 586 nm, fwhm = 89 nm, 0.33 eV, 2650 cm-1) under irradiation with UV to blue light. Hence, the structural difference between the two polymorphs goes along with a significant blue-shift of 16 nm. The results from single-crystal diffraction and single-grain luminescence measurements were confirmed by Rietveld analysis of bulk samples and powder luminescence data.
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Affiliation(s)
- Kilian M Rießbeck
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
| | - Daniel S Wimmer
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
| | - Markus Seibald
- ams-OSRAM International GmbH, Mittelstetter Weg 2, D-86830 Schwabmünchen, Germany
| | - Dominik Baumann
- ams-OSRAM International GmbH, Mittelstetter Weg 2, D-86830 Schwabmünchen, Germany
| | - Klaus Wurst
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
| | - Gunter Heymann
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
| | - Hubert Huppertz
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
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Luminescence and Scintillation in the Niobium Doped Oxyfluoride Rb4Ge5O9F6:Nb. INORGANICS 2022. [DOI: 10.3390/inorganics10060083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
A new niobium-doped inorganic scintillating oxyfluoride, Rb4Ge5O9F6:Nb, was synthesized in single crystal form by high-temperature flux growth. The host structure, Rb4Ge5O9F6, crystallizes in the orthorhombic space group Pbcn with lattice parameters a = 6.98430(10) Å, b = 11.7265(2) Å, and c = 19.2732(3) Å, consisting of germanium oxyfluoride layers made up of Ge3O9 units connected by GeO3F3 octahedra. In its pure form, Rb4Ge5O9F6 shows neither luminescence nor scintillation but when doped with niobium, Rb4Ge5O9F6:Nb exhibits bright blue luminescence and scintillation. The isostructural doped structure, Rb4Ge5O9F6:Nb, crystallizes in the orthorhombic space group Pbcn with lattice parameters a = 6.9960(3) Å, b = 11.7464(6) Å, and c = 19.3341(9) Å. X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements suggest that the niobium is located in an octahedral coordination environment. Optical measurements inform us that the niobium dopant acts as the activator. The synthesis, structure, and optical properties are reported, including radioluminescence (RL) measurements under X-ray irradiation.
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Dabić P, Nikolić MG, Kovač S, Kremenović A. Polymorphism and photoluminescence properties of K 3ErSi 2O 7. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2019; 75:1417-1423. [PMID: 31589158 DOI: 10.1107/s2053229619011926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 08/28/2019] [Indexed: 11/10/2022]
Abstract
Two polymorphs of tripotassium erbium disilicate, K3ErSi2O7, were synthesized by high-temperature flux crystal growth during the exploration of the flux technique for growing new alkali rare-earth elements (REE) containing silicates. Their crystal structures were determined by single-crystal X-ray diffraction analysis. One of them (denoted 1) crystallizes in the space group P63/mmc and is isostructural with disilicates K3LuSi2O7, K3ScSi2O7 and K3YSi2O7, while the other (denoted 2) crystallizes in the space group P63/mcm and is isostructural with disilicates K3NdSi2O7, K3REESi2O7 (REE = Gd-Yb), K3YSi2O7, K3(Y0.9Dy0.1)Si2O7 and K3SmSi2O7. In the crystal structure of polymorph 1, the Er cations are in an almost perfect octahedral coordination, while in the crystal structure of polymorph 2, part of the Er cations are in a slightly distorted octahedral coordination and the other part are in an ideal trigonal prismatic coordination environment. Sharing six corners, disilicate Si2O7 groups in the crystal structure of polymorph 1 link six ErO6 octahedra, forming a three-dimensional network and nine-coordinated potassium cations are located in its holes. In the crystal structure of polymorph 2, the disilicate Si2O7 groups connect four ErO6 octahedra, as well as one ErO6 trigonal prism. Three differently coordinated potassium cations are situated between them. Different site symmetries of the erbium cations in the crystal structures of polymorphs 1 and 2 affect their photoluminescence properties. Only polymorph 2 exhibits luminescence. Intense narrow lines in the emission spectrum are a result of the 4f-4f transition. The green emission line at 560 nm is the result of the Er3+ transition 4S3/2→4I15/2, and the luminescence line at 690 nm is the result of a 4F9/2→4I15/2 transition. The crystal morphologies of the two polymorphs are similar. Crystals of polymorph 1 are in the form of a hexagonal prism in combination with a hexagonal base, while crystals of polymorph 2 contain a dihexagonal prism in combination with a hexagonal base, although poorly developed faces of the dihexagonal pyramid can also be noticed.
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Affiliation(s)
- Predrag Dabić
- University of Belgrade, Faculty of Mining and Geology, Đušina 7, Belgrade 11000, Serbia
| | - Marko G Nikolić
- University of Belgrade, Institute of Physics, Pregrevica 118, Belgrade 11080, Serbia
| | - Sabina Kovač
- University of Belgrade, Faculty of Mining and Geology, Đušina 7, Belgrade 11000, Serbia
| | - Aleksandar Kremenović
- University of Belgrade, Faculty of Mining and Geology, Đušina 7, Belgrade 11000, Serbia
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Qiao J, Ning L, Molokeev MS, Chuang YC, Zhang Q, Poeppelmeier KR, Xia Z. Site-Selective Occupancy of Eu 2+ Toward Blue-Light-Excited Red Emission in a Rb 3 YSi 2 O 7 :Eu Phosphor. Angew Chem Int Ed Engl 2019; 58:11521-11526. [PMID: 31167043 DOI: 10.1002/anie.201905787] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 05/25/2019] [Indexed: 11/09/2022]
Abstract
Establishing an effective design principle in solid-state materials for a blue-light-excited Eu2+ -doped red-emitting oxide-based phosphors remains one of the significant challenges for white light-emitting diodes (WLEDs). Selective occupation of Eu2+ in inorganic polyhedra with small coordination numbers results in broad-band red emission as a result of enhanced crystal-field splitting of 5d levels. Rb3 YSi2 O7 :Eu exhibits a broad emission band at λmax =622 nm under 450 nm excitation, and structural analysis and DFT calculations support the concept that Eu2+ ions preferably occupy RbO6 and YO6 polyhedra and show the characteristic red emission band of Eu2+ . The excellent thermal quenching resistance, high color-rendering index Ra (93), and low CCT (4013 K) of the WLEDs clearly demonstrate that site engineering of rare-earth phosphors is an effective strategy to target tailored optical performance.
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Affiliation(s)
- Jianwei Qiao
- School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China
| | - Lixin Ning
- Anhui Key Laboratory of Optoelectric Materials Science and Technology, Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Normal University, Wuhu, 241000, China
| | - Maxim S Molokeev
- Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia.,Siberian Federal University, Krasnoyarsk, 660041, Russia.,Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
| | - Yu-Chun Chuang
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - Qinyuan Zhang
- State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
| | - Kenneth R Poeppelmeier
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208-3113, USA
| | - Zhiguo Xia
- School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.,State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
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Qiao J, Ning L, Molokeev MS, Chuang Y, Zhang Q, Poeppelmeier KR, Xia Z. Site‐Selective Occupancy of Eu
2+
Toward Blue‐Light‐Excited Red Emission in a Rb
3
YSi
2
O
7
:Eu Phosphor. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905787] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jianwei Qiao
- School of Materials Sciences and EngineeringUniversity of Science and Technology Beijing Beijing 100083 P. R. China
| | - Lixin Ning
- Anhui Key Laboratory of Optoelectric Materials Science and TechnologyKey Laboratory of Functional Molecular SolidsMinistry of EducationAnhui Normal University Wuhu 241000 China
| | - Maxim S. Molokeev
- Laboratory of Crystal PhysicsKirensky Institute of PhysicsFederal Research Center KSC SB RAS Krasnoyarsk 660036 Russia
- Siberian Federal University Krasnoyarsk 660041 Russia
- Department of PhysicsFar Eastern State Transport University Khabarovsk 680021 Russia
| | - Yu‐Chun Chuang
- National Synchrotron Radiation Research Center Hsinchu 300 Taiwan
| | - Qinyuan Zhang
- State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication MaterialsSouth China University of Technology Guangzhou 510641 China
| | - Kenneth R. Poeppelmeier
- Department of ChemistryNorthwestern University 2145 Sheridan Road Evanston IL 60208-3113 USA
| | - Zhiguo Xia
- School of Materials Sciences and EngineeringUniversity of Science and Technology Beijing Beijing 100083 P. R. China
- State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication MaterialsSouth China University of Technology Guangzhou 510641 China
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Usman M, Smith MD, Morrison G, Klepov VV, Zhang W, Halasyamani PS, zur Loye HC. Molten Alkali Halide Flux Growth of an Extensive Family of Noncentrosymmetric Rare Earth Sulfides: Structure and Magnetic and Optical (SHG) Properties. Inorg Chem 2019; 58:8541-8550. [DOI: 10.1021/acs.inorgchem.9b00849] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Mohammad Usman
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Gregory Morrison
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Vladislav V. Klepov
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Weiguo Zhang
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - P. Shiv Halasyamani
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Hans-Conrad zur Loye
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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Morrison G, Spagnuolo NR, Karakalos SG, zur Loye HC. Cs3REIIIGe3O9 (RE = Pr, Nd, and Sm–Yb) and Cs8TbIII2TbIVGe9O27: A Rare Example of a Mixed-Valent Tb(III)/Tb(IV) Oxide. Inorg Chem 2019; 58:8702-8709. [DOI: 10.1021/acs.inorgchem.9b01033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Synthesis, crystal structure and photoluminescence of Eu3+ or Tb3+ doped solid solutions (Y1-xREx)4S3(Si2O7). J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.05.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Morrison G, Latshaw AM, Spagnuolo NR, Zur Loye HC. Observation of Intense X-ray Scintillation in a Family of Mixed Anion Silicates, Cs 3RESi 4O 10F 2 (RE = Y, Eu-Lu), Obtained via an Enhanced Flux Crystal Growth Technique. J Am Chem Soc 2017; 139:14743-14748. [PMID: 28925696 DOI: 10.1021/jacs.7b08559] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A new family of mixed anion cesium rare earth silicates exhibiting intense scintillation in several ranges of the visible spectrum are reported. Cs3RESi4O10F2 (RE = Y, Eu-Lu) have been synthesized using an enhanced flux growth method for the targeted growth of mixed anion systems. This is the first example of this method being used for the growth of oxyhalides. The compounds crystallize in the triclinic space group P1̅ with the lattice parameters a = 7.0832(2) Å, b = 7.1346(2) Å, c = 16.2121(5) Å, α = 95.8090(10)°, β = 90.0580(10)°, γ = 119.7650(10)° for the Tb analogue. The structure consists of REO6 and REO2F4 polyhedra connected by Si4O10 sheets with a previously unobserved silicate sheet topology that contains the uncommon cyclic Si3O9 trimers. The synthesis, structure, magnetic and optical properties are reported including, notably, intense X-ray scintillation in Cs3TbSi4O10F2.
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Affiliation(s)
- Gregory Morrison
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Allison M Latshaw
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Nicholas R Spagnuolo
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
| | - Hans-Conrad Zur Loye
- Department of Chemistry and Biochemistry, University of South Carolina , Columbia, South Carolina 29208, United States
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