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Effect of annealing at oxygen partial pressure on the conductivity of NiMnO oxides

Journal of Materials Science: Materials in Electronics, ISSN: 1573-482X, Vol: 26, Issue: 6, Page: 4172-4177
2015
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This paper presents a study of the electrical properties of nickel manganite NiMnO as a function of annealing at oxygen partial pressure. The crystalline phase of manganite ceramics during annealing at oxygen partial pressure was investigated using X-ray diffraction; the predominant phase was tetragonal spinel. The electrical properties were analyzed by measuring resistance–temperature characteristics. The activation energy for electron hopping, determined using the slope of the ln ρ–1/T plots, was higher for samples annealed at lower oxygen partial pressure. The Mn/Mn ratio, obtained through differential thermal analysis, increased with an increase in the oxygen partial pressure during annealing. The relationship between resistivity and the Mn/Mn ratio during annealing at oxygen partial pressure was investigated.

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