TY - JOUR
T1 - Tyrrellite, Cu(Co0.68Ni0.32)2Se 4, isostructural with spinel
AU - Yang, Hexiong
AU - Hubler, David K.
AU - Lavina, Barbara
AU - Downs, Robert T.
AU - Costin, Gelu
PY - 2007/6/14
Y1 - 2007/6/14
N2 - 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.
AB - 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.
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U2 - 10.1107/S010827010703048X
DO - 10.1107/S010827010703048X
M3 - Article
C2 - 17675677
AN - SCOPUS:34547803772
VL - 63
SP - i73-i74
JO - Acta Crystallographica Section C: Crystal Structure Communications
JF - Acta Crystallographica Section C: Crystal Structure Communications
SN - 0108-2701
IS - 8
ER -