Thermodynamic stability of calcium vanadium garnet ferrites upon formation of substitutional solid solutions |
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Authors: | G V Denisov |
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Institution: | 1. Russian State Professional Pedagogical University, Yekaterinburg, Russia
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Abstract: | The thermodynamic stability of calcium vanadium garnet ferrites Ca3Fe3.5 ? x Ti2x V1.5 ? x O12 upon isomorphic substitution of titanium ions for iron and vanadium ions was studied by the EMF method using ZrO2(Y2O3) ceramic solid electrolyte. Temperature-dependent ΔG 0 was determined. Isomorphic substitutions of titanium ions for iron and vanadium ions in the inequivalent sublattices of the garnet structure in a temperature range of 1100–1483 K cause changes in ΔG 0 due to the entropy and enthalpy components and has a minimal value when x = 0.15. |
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