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Title: Syntheses, crystal structure and magnetic properties of Tl9RETe6 (RE = Ce, Sm, Gd)
Authors: Isaeva, A.Schönemann, R.Doert, T.
Publishers Version:
Issue Date: 2020
Published in: Crystals Vol. 10 (2020), No. 4
Publisher: Basel : MDPI AG
Abstract: 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.
Keywords: Crystal structure; Magnetic properties; Rare-earth metals; Tellurides; Thallium
DDC: 540
License: CC BY 4.0 Unported
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Appears in Collections:Chemie

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