The extent of nickel ferrite formation, as affected by four preparatory techniques, was investigated by determining the magnetic moment of the reacted powder with a vibrating‐coil magnetometer. The oxide, carbonate, hydroxide, and oxalate methods were used. At low temperatures the hydroxide and oxalate techniques were found to give the greatest yield of ferrospinel. The hydroxide method yielded a magnetic material by precipitation. Weight‐loss measurements were correlated to the magnetic data.
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George Economos (1959) studied this question.