Abstract
In inverse tin spinels (Mg, M) 2SnO 4 (with M = Zn, Co, or Ni), the distribution of bivalent metal atoms was determined from samples which had been quenched from 1473 or 1073 K or cooled slowly. In Mg 2SnO 4, zinc preferentially occupies tetrahedral sites with Δ G°-values of about 18 kJ/g-atom. Cobalt and magnesium are equally distributed over octahedral and tetrahedral sites, whereas nickel occupies octahedral sites only. Lattice constants of (Mg,Zn) 2SnO 4 solid solutions deviate largely from Vegard's law, but depend linearly on the zinc concentrations in tetrahedral and octahedral sites, according to: a = c 0 + c 1[Zn(tetr)] + c 2[Zn(oct)]. Zinc in tetrahedral sites causes a lattice contraction: in octahedral sites, however, it causes a lattice expansion.
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