New Fe-based layered telluride Fe3-δAs1-yTe2: synthesis, crystal structure and physical properties. Verchenko, V. Y., Sokolov, S. A., Tsirlin, A. A., Sobolev, A. V., Presniakov, I. A., Bykov, M. A., Maria, K., & Shevelkov, A. V. Dalton Transactions, 2016. doi abstract bibtex A new ternary telluride, Fe3-δAs1-yTe2, was synthesized from elements at 600 \${\textbackslash}circ\$C. It crystallizes in the hexagonal P63/mmc space group with the unit cell parameters a = 3.85091(9) \textbackslashAA and c = 17.1367(4) \textbackslashAA 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 \textless δ \textless 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 \${\textbackslash}sim\$ 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.
@article{verchenko_new_2016,
title = {New {Fe}-based layered telluride {Fe}3-δ{As}1-{yTe}2: synthesis, crystal structure and physical properties},
issn = {1477-9226; 1477-9234},
doi = {10.1039/C6DT02721K},
abstract = {A new ternary telluride, Fe3-δAs1-yTe2, was synthesized from elements at 600 \${\textbackslash}circ\$C. It crystallizes in the hexagonal P63/mmc space group with the unit cell parameters a = 3.85091(9) {\textbackslash}AA and c = 17.1367(4) {\textbackslash}AA 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 {\textless} δ {\textless} 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 \${\textbackslash}sim\$ 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.},
language = {english},
journal = {Dalton Transactions},
author = {Verchenko, Valeriy Yu and Sokolov, Sergey A. and Tsirlin, Alexander A. and Sobolev, Alexey V. and Presniakov, Igor A. and Bykov, Michael A. and Maria, Kirsanova and Shevelkov, Andrei V.},
year = {2016}
}
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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 \\textless δ \\textless 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 \\${\\textbackslash}sim\\$ 0.1 μB/Fe at T = 2 K. This transition is confirmed by differential scanning calorimetry. 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