Tyrrellite, Cu(Co0.68Ni0.32)2Se 4, isostructural with spinel

Hexiong Yang, David K. Hubler, Barbara Lavina, Robert T. Downs, Gelu Costin

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Abstract

Tyrrellite, a naturally occurring Co-Ni-Cu selenide, has been studied by single-crystal X-ray diffraction. It possesses the normal spinel-type structure, with Cu occupying the tetra-hedral site and (Co+Ni) the octa-hedral site. The average Cu - Se distance of 2.3688 (2) Å is close to that of 2.3703 (8) Å in CuCr2Se4, whereas the average (Co+Ni) - Se distance of 2.3840 (1) Å appears to be slightly shorter than most octa-hedral Co - Se or Ni - Se distances (2.40-2.50 Å) in other selenides. The refined structure provides a basis for a redefinition of the ideal chemical formula of tyrrellite, which should be Cu(Co,Ni)2Se4, rather than the previously suggested (Cu,Co,Ni)3Se4.

Original languageEnglish (US)
Pages (from-to)i73-i74
JournalActa Crystallographica Section C: Crystal Structure Communications
Volume63
Issue number8
DOIs
StatePublished - Jun 14 2007

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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