Abstract
The as-sintered Mn1.1Ni1.4Co0.5O4 crystallized in the solid solution of cubic spinel Mn-Ni-Co oxides, along with a small amount of the cubic spinel Ni-rich oxide phase. On the other hand, the Cr-substituted Mn1.1Ni1.4 Co0.5− x Cr x O4 (0.07 ≤x ≤q 0.35) showed a single phase of cubic spinel Mn-Ni-Co-Cr oxides. This indicates that the substituted Cr suppressed the decomposition in the oxides. In addition, the Cr hindered the grain growth during sintering and increased the porosity. The electrical resistivity, the B 25/85 constant, and the activation energy of the Mn1.1Ni1.4Co0.5− x Cr x O4 NTC thermistors increased with increasing Cr content. It is demonstrated that the Cr-substituted Mn1.1Ni1.4Co0.5− x Cr x O4 NTC thermistors provided a variety of electrical properties, depending on the composition.
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Park, K., Han, I.H. Effect of Cr2O3 addition on the microstructure and electrical properties of Mn-Ni-Co oxides NTC thermistors. J Electroceram 17, 1069–1073 (2006). https://doi.org/10.1007/s10832-006-8317-6
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DOI: https://doi.org/10.1007/s10832-006-8317-6