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Open AccessArticle

Syntheses, Crystal Structure and Magnetic Properties of Tl9RETe6 (RE = Ce, Sm, Gd)

by Anna Isaeva 1,2, Rico Schönemann 3,† and Thomas Doert 4,*
1
Faculty of Physics, Technische Universität Dresden, D–01062 Dresden, Germany
2
Leibniz Institute for Solid State Research, IFW Dresden, D–01069 Dresden, Germany
3
Hochfeld-Magnetlabor (HLD-EMFL), Helmholtz-Zentrum Dresden Rossendorf, D–01328 Dresden, Germany
4
Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, D–01062 Dresden, Germany
*
Author to whom correspondence should be addressed.
Present address: MPA-MAGLAB, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Crystals 2020, 10(4), 277; https://doi.org/10.3390/cryst10040277
Received: 17 March 2020 / Revised: 31 March 2020 / Accepted: 2 April 2020 / Published: 7 April 2020
(This article belongs to the Section Crystalline Materials)
The three compounds Tl9RETe6 with RE = Ce, Sm, Gd were synthesized from the elements at 1020 K. Their isostructural crystal structures are ordered derivatives of the Tl5Te3 type with rare-earth metal and thallium occupying different Wyckoff positions. The structures can be understood as charge-ordered in accordance with the Zintl-Klemm concept: 9 Tl+ + RE3+ + 6 Te2−. DFT calculations for Tl9GdTe6, however, result in a low, but finite density of states at the Fermi level. Magnetic data confirm trivalent Gd, but indicate a small amount of Ce4+ in Tl9CeTe6; no indications for long-range magnetic order was found down to T = 2 K. View Full-Text
Keywords: Tellurides; thallium; rare-earth metals; crystal structure; magnetic properties Tellurides; thallium; rare-earth metals; crystal structure; magnetic properties
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MDPI and ACS Style

Isaeva, A.; Schönemann, R.; Doert, T. Syntheses, Crystal Structure and Magnetic Properties of Tl9RETe6 (RE = Ce, Sm, Gd). Crystals 2020, 10, 277.

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