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New Fe-based layered telluride Fe3-δAs1-yTe2: synthesis, crystal structure and physical propertiesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Valeriy Verchenko, Sokolov Sergey A., Tsirlin Alexander A., Sobolev Alexey V., Presniakov Igor A., Bykov Michael A., Maria Kirsanova, Shevelkov Andrei V.
- Журнал: Dalton Transactions
- Год издания: 2016
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/C6DT02721K
- Аннотация: A new ternary telluride, Fe3-δAs1-yTe2, was synthesized from elements at 600 °C. It crystallizes in the hexagonal P63/mmc space group with the unit cell parameters a = 3.85091(9) Å and c = 17.1367(4) Å for δ = 0.3 and y = 0.04. Its layered crystal structure contains partially occupied intralayer and interlayer Fe positions, which give rise to significant nonstoichiometry: Fe3-δAs1-yTe2 was found to possess the homogeneity range of 0.25 < δ < 0.45 and y = 0.04. Regions of local vacancy ordering alternate with regions of randomly distributed vacancies; so that the ordering of Fe atoms and vacancies is not complete in the average structure. A clear evidence of the magnetic phase transition is obtained by thermodynamic measurements, Mössbauer spectroscopy, and neutron powder diffraction. Magnetic susceptibility measurements reveal weak ferromagnetism below TC = 123 K with a net moment of MS ~ 0.1 μB/Fe at T = 2 K. This transition is confirmed by differential scanning calorimetry. Additionally, neutron powder diffraction indicates an onset of a complex AFM-like magnetic ordering below 100 K.
- Добавил в систему: Соколов Сергей Александрович