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As is known that calcination temperature plays an important role on structure and properties of ceramic powders. In order to improve the conductivity of Er-doped CaMnO3 powders, we synthesized Ca0.75Er0.25MnO3−δ powders at different calcination temperatures from 900 to 1,100 °C by sol–gel auto-combustion method. The relationship among calcination temperature, grain size, Mn valence and resistivity...
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