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The cation distributions in the spinel phases of the mixed vanadium oxides LiZn x V 2‐ x O 4 and LiMg x V 2‐ x O 4
Author(s) -
Pollert Emil
Publication year - 1973
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19730080712
Subject(s) - spinel , vanadium , tetragonal crystal system , lattice constant , magnesium , chemistry , zinc , ion , inorganic chemistry , manganese , solid solution , crystallography , analytical chemistry (journal) , diffraction , materials science , crystal structure , metallurgy , physics , organic chemistry , optics , chromatography
Cation distributions and values of the oxygen parameter in the spinel phases of mixed vanadium oxides with the general formula Li x MeV 2– x O 4 , where Me is Zn or Mg, respectively, were studied by X‐ray diffraction measurements. The distribution of cations on the sublattices in the zinc series can be expressed by the formula Li 1– x –δ Zn x V δ [Li x +δ V 2– x ‐δ ] and for the magnesium series by the formula Li 1–δ V δ [Li δ Mg x V 2– x ‐δ ]. For the zinc series a general uniform increase of the oxygen parameter was determined. The substitution of magnesium ions leads to an anomal course of this parameter, which is possible to explain by substitution of magnesium ions on intersticial sites. The results are discussed using the values of the Madelung energy. The recently observed tetragonal deformation of the spinel lattice for the bulk composition Li Mg 0.375 V 1.625 O 4 is explained by a cooperative Jahn Teller effect of V 4+ ions.