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Main Title: Verteilung und Valenz der Kationen im Spinellsystem ZnFeGaO4-Fe2GaO4
Translated Title: Distribution and Valence of the Cations in the Spinel System ZnFeGaO4-Fe2GaO4
Author(s): Rabbani, Sima
Riedel, Erwin
Type: Article
Language Code: de
Abstract: For the spinel system Zn1-ϰFe-λGaϰ-λ(Fe1+λGa1-λ)O4 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 Fe2+ and Fe3+ ions over the lattice sites has been derived from lattice constants and ionic distances, and also by Mössbauer spectroscopy. In the spinels with ϰ < 0,3 the tetrahedral sites are preferably occupied by Fe2+ ions, for x > 0,5 Fe3+ 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.
Issue Date: 1996
Date Available: 10-Nov-2018
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): iron gallium spineis
cation distribution
valence distribution
Mössbauer spectra
Seebeck coefficients
Journal Title: Zeitschrift für Naturforschung B
Publisher: De Gruyter
Publisher Place: Berlin
Volume: 51
Issue: 1
Publisher DOI: 10.1515/znb-1996-0111
Page Start: 47
Page End: 51
EISSN: 1865-7117
ISSN: 0932-0776
Appears in Collections:Inst. Chemie » Publications

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