Библиографическое описание:Magnetic, Optical, and Thermic Properties of SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) Compounds : научное издание / Navruzbek N. Habibullayev [et al.]. - Текст : непосредственный // Magnetochemistry. - 2023. - Т.9, №8. - P. 194. - ISSN 2312-7481, DOI 10.3390/magnetochemistry9080194.
Аннотация:<jats:p>SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds crystallize in the Pnma and Cmcm orthorhombic space group and belong to the Eu2CuS3 and KCuZrS3 structural type, respectively. According to a single-crystal XRD study, the SrTmCuSe3 unit cell parameters are a = 4.0631 (4), b = 13.4544 (14), c = 10.4430 (10) Å, and V = 570.88 (10) Å3. All the studied SrLnCuSe3 samples in the temperature range of 1.77–300 K demonstrate paramagnetic behavior without any features pointing to magnetic ordering. The measured Curie constants coincide with the values expected for Ln3+ ions with good accuracy, which confirms the stoichiometric composition of the samples and the non-magnetic state of the copper ions, Cu1+ (S = 0). The conducted optical absorption study showed that the polycrystalline SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) samples are semiconductors with a direct bandgap ranging from 2.14 eV to 2.31 eV. Two indirect bandgaps were revealed and explained by the presence of optical transitions to highly dispersive subbands in the conduction band. The compounds demonstrate two reversible phase transitions α⇆β, β⇆γ and an incongruent melting at 1606 K (Dy), 1584 K (Ho), 1634 K (Er), and 1620 K (Tm) associated with the formation of solid solutions of SrSe, Cu2-XSe, and Ln2Se3 binary compounds.</jats:p>
Держатель оригинала документа:Department of General and Special Chemistry, Industrial University of Tyumen, Department of Photonics and Laser Technology, Siberian Federal University, Department of Physical and Applied Chemistry, Kurgan State University, Department of Physics, Far Eastern State Transport University, Institute of Chemistry, University of Tyumen, Institute of Solid State Chemistry, Kirensky Institute of Physics, Federal Research Center, Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center, Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Nikolaev Institute of Inorganic Chemistry SB RAS
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