Loading…

New Fe-based layered telluride Fe 3-δ As 1-y Te 2 : synthesis, crystal structure and physical properties

A new ternary telluride, Fe As Te , was synthesized from elements at 600 °C. It crystallizes in the hexagonal P6 /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 int...

Full description

Saved in:
Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2016-11, Vol.45 (42), p.16938-16947
Main Authors: Verchenko, Valeriy Yu, Sokolov, Sergei S, Tsirlin, Alexander A, Sobolev, Alexey V, Presniakov, Igor A, Bykov, Mikhail A, Kirsanova, Maria A, Shevelkov, Andrei V
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new ternary telluride, Fe As Te , was synthesized from elements at 600 °C. It crystallizes in the hexagonal P6 /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: Fe As Te 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. 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 T = 123 K with a net moment of M ∼ 0.1μ /Fe at T = 2 K. This transition is confirmed by differential scanning calorimetry. Additionally, neutron powder diffraction indicates the onset of a complex AFM-like magnetic ordering below 100 K.
ISSN:1477-9226
1477-9234
DOI:10.1039/C6DT02721K