An investigation of the rare-earth telluride system BaLn2Te4 (Ln=Sm-Tm, Y):: syntheses, crystal structures, and magnetic properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:303

Article; Proceedings Paper

Narducci, AA ; Yang, YT ; Digman, MA ; Sipes, AB ; Ibers, JA

关键词: synthesis;    solid-state compounds;    tellurides;    rare-earths;   

DOI  :  10.1016/S0925-8388(00)00653-8

来源: Elsevier

【 摘 要 】

Single crystals of BaLn(2)Te(4) (Ln=Gd-Tm, Y) form as black needles from the stoichiometric reaction BaTe+2Ln+3Te at 1000 degrees C. BaSm2Te4 forms as a by-product in the reaction BaTe+Sm+Zn+Te at 850 degrees C with the aid of a BaBr2/KBr flux. The compounds crystallize with four formula units in the space group D-2h(16) -Pnma (No. 62) in the CaFe2O4 (calcium ferrite) structure type. Unit cell constants range from a = 13.6883(10) Angstrom, b = 4.5148(3) Angstrom, and c = 16.3427(12) Angstrom in the Sm compound to a = 13.5677(10) Angstrom, b = 4.4058(3) Angstrom, and c = 15.9989(12) Angstrom for Tm (t = - 120 degrees C). In atoms are coordinated by six Te atoms in an octahedral arrangement. These octahedra share corners and edges to form a three-dimensional channel structure. Ba atoms occupy the bicapped trigonal-prismatic sites within these channels. Magnetic susceptibility data for two representative compounds (Ln=Er and Tb) show paramagnetic behavior in the region 5-300 K. (C) 2000 Elsevier Science S.A. All rights reserved.

【 授权许可】

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