The effect of electronic and ionic-defect structure on the rate of formation of nickel ferrite spinel was investigated; the reaction was followed by magnetic analysis. Nickel oxide was doped with small amounts of lithium and chromic oxides, and ferric oxide with titanium dioxide. The addition of foreign ions markedly influences the rate of formation of the spinel, especially in the case of nickel oxide doped with chromic oxide. The variation of electrical resistance of these mixed oxides during formation of spinel was also studied.
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