Syntheses, crystal structures, and physical properties of the new thorium chalcogenides CuTh{sub 2}Te{sub 6} and SrTh{sub 2}Se{sub 5}
- Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Single crystals of CuTh{sub 2}Te{sub 6} form by a stoichiometric reaction of the elements at 1,000 C. The structure was solved from single-crystal X-ray data. It consists of layers of {sub {infinity}}{sup 2}[Th{sub 2}Te{sub 6}{sup {minus}}] double chains joined by Cu{sup +} cations. Each Th atom is coordinated to eight Te atoms in a bicapped trigonal prismatic arrangement. There are three crystallographically unique Te atoms. Each ThTe{sub 8} unit is bridged through one distinct Te atom, such that the capping Te atom of one unit forms the vertex of its neighbor. The two nonbridging Te atoms form infinite Te-Te chains along the exterior of the {sub {infinity}}{sup 2}[Th{sub 2}Te{sub 6}{sup {minus}}] layer. Copper atoms are coordinated to these Te atoms in a tetrahedral arrangement. Four-probe dc electrical conductivity measurements of a single crystal of CuTh{sub 2}Te{sub 6} indicate the compound is a semiconductor along [010]. Magnetic susceptibility measurements in the range 2--300 K show CuTh{sub 2}Te{sub 6} to be paramagnetic. Single crystals of SrTh{sub 2}Se{sub 5} form from the reaction SrSe + Th + 3Sn + 3Se at 1,000 C. The structure is a three-dimensional framework with Sr cations located in one-dimensional channels. There are two distinct Th environments, bicapped trigonal prismatic and distorted monocapped octahedral.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 653423
- Journal Information:
- Inorganic Chemistry, Vol. 37, Issue 15; Other Information: PBD: 27 Jul 1998
- Country of Publication:
- United States
- Language:
- English
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