Substitution of indium for chromium in TlIn_5-x Cr _x Se₈: crystal structure of TlIn_4.811(5)Cr_0.189(5)Se₈.

ABSTRACT: The new thallium penta-(indium/chromium) octa-selenide, TlIn_4.811(5)Cr_0.189(5)Se₈, has been synthesized by solid-state reaction. It crystallizes isotypically with TlIn₅Se₈ in the space group C2/m. Although the two Tl positions are disordered and only partially occupied, no Tl deficiency was observed. The insertion of chromium in the structure has been confirmed by EDS analysis. Chromium substitutes indium exclusively at one of three In sites, viz. at one of the positions with site symmetry 2/m (Wyckoff position 2a). In the crystal structure, edge-sharing InSe₆ octa-hedra, and (In,Cr)Se₆ octa-hedra and InSe₄ tetra-hedra make up two types of columns that are linked into

SUBMITTER: Lefevre R 

PROVIDER: S-EPMC5382607 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature