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Effect of thermal history and chemical composition on aging of NixMn3 − xO4 + δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the NixMn3 − xO4 + δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise...
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