Studies on some titanium-substituted Fe{sub 2}MoO{sub 4} spinel oxides
Journal Article
·
· Journal of Solid State Chemistry
- Indian Inst. of Tech., Kharagpur (India). Chemistry Dept.
Electrical resistivity ({rho}) and thermoelectric power ({alpha}) measurements were carried out in inert atmosphere on Fe{sub 2}Mo{sub 1{minus}x}Ti{sub x}O{sub 4} (0.0 {le} x {le} 1.0) spinel oxides in the temperature ranges 100--600 and 300--600 K, respectively. Thermal activation energy (E{sub a}), carrier concentration (n), activation energy for carrier concentration generation (E{sub n}), and mobility ({mu}) values have been calculated from resistivity and thermoelectric power data. The results show that conduction in titanium-substituted Fe{sub 2}MoO{sub 4} samples, i.e., Fe{sub 2}Mo{sub 1{minus}x}Ti{sub x}O{sub 4}, is carried out through the hopping of charge carriers, and the linear ln ({rho}) 1/T plots show a break at the magnetic phase transition temperature. Progressive substitution of molybdenum by titanium in Fe{sub 2}MoO{sub 4} shows that the ratio of Fe{sup 3+}/Fe{sup 2+} decreases and in Fe{sub 2}TiO{sub 4} the ratio is very small. The decrease in the amount of Fe{sup 3+} with increasing x results in the high resistivity and large lattice parameter of Fe{sub 2}TiO{sub 4}.
- OSTI ID:
- 305391
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 140; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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