Abstract
ZnII-bearing ferrites with spinel-type structure have been synthesized in strongly alkaline solutions of iron(III) tartrate containing ZnII ions at 100 °C. The ZnII-bearing ferrites contain few FeIIions, but have a high cation vacancy content (high-vacancy-content ZnII-bearing ferrite). The ferrites are solid solutions represented by x(ZnFe2O4)–y(Fe3O4)-Z(γ-Fe2O3), where x+y+z= 1 (0.16⩽x⩽0.90, 0.01 ⩽y⩽ 0.02, 0.09 ⩽z⩽ 0.82). The cation vacancies are replaced with the ZnIIions in the reaction solution, and the replaced number increases with an increase in the concentration of the ZnII ions. The high-vacancy-content ZnII-bearing ferrites have an ultrafine particle size, < 20 nm. The crystal growth of the ferrite particles is accelerated with the ZnII ions in the reaction solution.
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