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For the spinel system Zn 1-ϰ Fe-λGa ϰ-λ (Fe 1+λ Ga 1-λ )O 4  the index λ has been determined by X-ray measurements: λ = 0 in the region 0 ≤  ϰ  ≤ 0,35; the increase of λ to 0,62 within 0,35 ≤  χ  ≤ 1 is nearly linear. The distribution of Fe 2+  and Fe 3+  ions over the lattice sites has been derived from lattice constants and ionic distances, and also by Mössbauer spectroscopy. In the spinels with  ϰ  &lt; 0,3 the tetrahedral sites are preferably occupied by Fe 2+  ions, for x &gt; 0,5 Fe 3+  ions dominate. At  ϰ  = 0,4 the occupation of the lattice sites by iron ions is statistical, the high temperature Mössbauer spectrum shows a single line only. All spinels are n-type hopping conductors mainly conducting via the octahedral sites.

zeitschrift für naturforschung b

Verteilung und Valenz der Kationen im Spinellsystem ZnFeGaO 4 -Fe 2 GaO 4  / Distribution and Valence of the Cations in the Spinel System ZnFeGaO 4 -Fe 2 GaO 4