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Ruseikina AV, Grigoriev MV, Locke RJC, Chernyshev VA, Schleid T. Syntheses and Patterns of Changes in Structural Parameters of the New Quaternary Tellurides Eu RECuTe 3 ( RE = Ho, Tm, and Sc): Experiment and Theory. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3378. [PMID: 39063671 PMCID: PMC11277929 DOI: 10.3390/ma17143378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2024] [Revised: 06/24/2024] [Accepted: 07/05/2024] [Indexed: 07/28/2024]
Abstract
The layered orthorhombic quaternary tellurides EuRECuTe3 (RE = Ho, Tm, Sc) with Cmcm symmetry were first synthesized. Single crystals of the compounds up to 500 μm in size were obtained by the halide-flux method at 1120 K from elements taken in a ratio of Eu/RE/Cu/Te = 1:1:1:3. In the series of compounds, the changes in lattice parameters were in the ranges a = 4.3129(3)-4.2341(3) Å, b = 14.3150(9)-14.1562(9) Å, c = 11.2312(7)-10.8698(7) Å, V = 693.40(8)-651.52(7) Å3. In the structures, the cations Eu2+, RE3+ (RE = Ho, Tm, Sc), and Cu+ occupied independent crystallographic positions. The structures were built with distorted copper tetrahedra forming infinite chains [CuTe4]7- and octahedra [RETe6]9- forming two-dimensional layers along the a-axis. These coordination polyhedra formed parallel two-dimensional layers CuRETe32-∞2. Between the layers, along the a-axis, chains of europium trigonal prisms [EuTe6]10- were located. Regularities in the variation of structural parameters and the degree of distortion of coordination polyhedra depending on the ionic radius of the rare-earth metal in the compounds EuRECuCh3 (RE = Ho, Er, Tm, Lu, Sc; Ch = S, Se, Te) were established. It is shown that with a decrease in the ionic radius ri(RE3+) in the compounds EuRECuTe3, the unit-cell volume, bond length d(RE-Te), distortion degree [CuTe4]7-, and crystallographic compression of layers [RECuTe3]2- decreased. The distortion degree of tetrahedral polyhedra [CuCh4]7-, as well as the structural parameters in europium rare-earth copper tellurides EuRECuTe3, were higher than in isostructural quaternary chalcogenides. Ab initio calculations of the crystalline structure, phonon spectrum, and elastic properties of compounds EuRECuTe3 (RE = Ho, Tm, and Sc) ere conducted. The types and wave numbers of fundamental modes were determined, and the involvement of ions in IR and Raman modes was assessed. The calculated data of the crystal structure correlated well with the experimental results.
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Affiliation(s)
- Anna V. Ruseikina
- Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, 625003 Tyumen, Russia;
| | - Maxim V. Grigoriev
- Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, 625003 Tyumen, Russia;
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany;
| | - Ralf J. C. Locke
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany;
| | - Vladimir A. Chernyshev
- Institute of Natural Sciences and Mathematics, Ural Federal University named after the First President of Russia B.N. Yeltsin, 620002 Ekaterinburg, Russia;
| | - Thomas Schleid
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany;
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Grigoriev M, Ruseikina AV, Garmonov AA, Locke RJC, Sagan F, Hooper J, Mitoraj MP, Schleid T, Safin DA. Experimental and Theoretical Insights on the Structural, Electronic, and Magnetic Properties of the Quaternary Selenides EuPrCuSe 3 and EuNdCuSe 3. Inorg Chem 2024; 63:9040-9049. [PMID: 38710009 PMCID: PMC11110001 DOI: 10.1021/acs.inorgchem.3c04560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Revised: 04/02/2024] [Accepted: 04/15/2024] [Indexed: 05/08/2024]
Abstract
Magnetic semiconductors EuPrCuSe3 and EuNdCuSe3 were obtained by using the halide flux method. Their crystal structures and magnetic properties were studied and discussed. Optical properties of the obtained selenides were studied by the means of diffuse reflectance spectroscopy, which revealed the values of 1.92/1.97 and 0.90/0.94 eV for the direct and indirect band gaps of Ln = Nd/Pr, respectively. The structural, electronic, and magnetic properties of the obtained compounds were additionally studied with spin-polarized density functional theory calculations, wherein both systems were found to be two new examples of semiconducting quaternary selenides with disperse conduction bands of Nd/Pr 5d character. The modeling showed that various magnetic orderings in the systems have subtle influences on the alignments/overlaps between the Se/Cu, Eu, and Pr/Nd bands, and that the spin-state energetics are very dependent upon the treatment of electron correlation, but a distinguishing feature in the case of ferromagnetic coupling is that the spin density on the Se atoms is maximized. Overall, the calculations are in good agreement with the experimental characterization of ferromagnetism in the bulk crystals, wherein the ferromagnetic transition occurs at temperatures of about 2.5 K for EuPrCuSe3 and about 3 K for EuNdCuSe3.
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Affiliation(s)
- Maxim
V. Grigoriev
- Laboratory
of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Volodarskogo Street 6, 625003 Tyumen, Russian
Federation
| | - Anna V. Ruseikina
- Laboratory
of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Volodarskogo Street 6, 625003 Tyumen, Russian
Federation
| | - Alexander A. Garmonov
- Institute
of Physics and Technology, University of
Tyumen, Volodarskogo
Street 6, 625003 Tyumen, Russian Federation
| | - Ralf J. C. Locke
- Institute
for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Filip Sagan
- Faculty
of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - James Hooper
- Faculty
of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - Mariusz P. Mitoraj
- Faculty
of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Krakow, Poland
| | - Thomas Schleid
- Institute
for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Damir A. Safin
- Scientific
and Educational and Innovation Center for Chemical and Pharmaceutical
Technologies, Ural Federal University Named
after the First President of Russia B.N. Yeltsin, Mira Street 19, 620002 Ekaterinburg, Russian Federation
- University
of Tyumen, Volodarskogo
Street 6, 625003 Tyumen, Russian Federation
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Ruseikina AV, Grigoriev MV, Locke RJC, Chernyshev VA, Garmonov AA, Schleid T. Synthesis, Crystal Structure, and Optical and Magnetic Properties of the New Quaternary Erbium Telluride EuErCuTe 3: Experiment and Calculation. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2284. [PMID: 38793350 PMCID: PMC11123308 DOI: 10.3390/ma17102284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/22/2024] [Accepted: 04/26/2024] [Indexed: 05/26/2024]
Abstract
This paper reports for the first time on a new layered magnetic heterometallic erbium telluride EuErCuTe3. Single crystals of the compound were obtained from the elements at 1120 K using CsI as a flux. The crystal structure of EuErCuTe3 was solved in the space group Cmcm (a = 4.3086(3) Å, b = 14.3093(9) Å, and c = 11.1957(7) Å) with the KZrCuS3 structure type. In the orthorhombic structure of erbium telluride, distorted octahedra ([ErTe6]9-) form two-dimensional layers (Er(Te1)2/2e(Te2)4/2k-)∞2, while distorted tetrahedra ([CuTe4]7-) form one-dimensionally connected substructures (Cu(Te1)2/2e(Te2)2/1t5-∞1) along the [100] direction. The distorted octahedra and tetrahedra form parallel two-dimensional layers (CuErTe32-∞2) between which Eu2+ ions are located in a trigonal-prismatic coordination environment (EuTe610-). The trigonal prisms are connected by faces, forming chains (Eu(Te1)2/2(Te2)4/22-∞1) along the [100] direction. Regularities in the variations in structural parameters were established in the series of erbium chalcogenides (EuErCuCh3 with Ch = S, Se, and Te) and tellurides (EuLnCuTe3 with Ln = Gd, Er, and Lu). Ab-initio calculations of the crystal structure, phonon spectrum, and elastic properties of the compound EuErCuTe3 were performed. The types and wavenumbers of fundamental modes were determined, and the involvement of ions in the IR and Raman modes was assessed. The experimental Raman spectra were interpreted. The telluride EuErCuTe3 at temperatures below 4.2 K was ferrimagnetic, as were the sulfide and selenide derivatives (EuErCuCh3 with Ch = S and Se). Its experimental magnetic characteristics were close to the calculated ones. The decrease in the magnetic phase transition temperature in the series of the erbium chalcogenides was discovered.
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Affiliation(s)
- Anna V. Ruseikina
- Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia;
| | - Maxim V. Grigoriev
- Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia;
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Ralf J. C. Locke
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
| | - Vladimir A. Chernyshev
- Institute of Natural Sciences and Mathematics, Ural Federal University Named after the First President of Russia B.N. Yeltsin, Ekaterinburg 620002, Russia;
| | | | - Thomas Schleid
- Institute for Inorganic Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany
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Shtykova M, Vorob'eva V, Fedorov P, Molokeev M, Aleksandrovsky A, Elyshev A, Palamarchuk I, Yurev I, Ivanov A, Habibullayev N, Abulkhaev M, Andreev O. Features of phase equilibria and properties of phases in the Sb-Sm-Se system. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Azam S, Gul B, Ali N, Ahmad K, Khan R, Hegazy H, Khan W, Aftab S, Rahman AU. Enlightening the stability and optoelectronic properties of Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) semiconductors: A first-principles study. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Quaternary Selenides EuLnCuSe 3: Synthesis, Structures, Properties and In Silico Studies. Int J Mol Sci 2022; 23:ijms23031503. [PMID: 35163428 PMCID: PMC8836063 DOI: 10.3390/ijms23031503] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 01/20/2022] [Accepted: 01/25/2022] [Indexed: 01/25/2023] Open
Abstract
In this work, we report on the synthesis, in-depth crystal structure studies as well as optical and magnetic properties of newly synthesized heterometallic quaternary selenides of the Eu+2Ln+3Cu+1Se3 composition. Crystal structures of the obtained compounds were refined by the derivative difference minimization (DDM) method from the powder X-ray diffraction data. The structures are found to belong to orthorhombic space groups Pnma (structure type Ba2MnS3 for EuLaCuSe3 and structure type Eu2CuS3 for EuLnCuSe3, where Ln = Sm, Gd, Tb, Dy, Ho and Y) and Cmcm (structure type KZrCuS3 for EuLnCuSe3, where Ln = Tm, Yb and Lu). Space groups Pnma and Cmcm were delimited based on the tolerance factor t', and vibrational spectroscopy additionally confirmed the formation of three structural types. With a decrease in the ionic radius of Ln3+ in the reported structures, the distortion of the (LnCuSe3) layers decreases, and a gradual formation of the more symmetric structure occurs in the sequence Ba2MnS3 → Eu2CuS3 → KZrCuS3. According to magnetic studies, compounds EuLnCuSe3 (Ln = Tb, Dy, Ho and Tm) each exhibit ferrimagnetic properties with transition temperatures ranging from 4.7 to 6.3 K. A negative magnetization effect is observed for compound EuHoCuSe3 at temperatures below 4.8 K. The magnetic properties of the discussed selenides and isostructural sulfides were compared. The direct optical band gaps for EuLnCuSe3, subtracted from the corresponding diffuse reflectance spectra, were found to be 1.87-2.09 eV. Deviation between experimental and calculated band gaps is ascribed to lower d states of Eu2+ in the crystal field of EuLnCuSe3, while anomalous narrowing of the band gap of EuYbCuSe3 is explained by the low-lying charge-transfer state. Ab initio calculations of the crystal structures, elastic properties and phonon spectra of the reported compounds were performed.
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