摘要 |
A black composite oxide particle includes a composite oxide having Fe, Mg and Al as metal components. The particle contains Fe, Mg and Al in amounts of 30 to 55 mass %, 1 to 10 mass %, and 1 to 10 mass %, respectively, and has an atomic ratio of Fe<SUP>3+</SUP>/Fe<SUP>2+</SUP> of 0.8 to 10. Also described is a method for producing the black composite oxide particle. In an embodiment, the particle includes a hydrated composite oxide represented by an empirical formula: Fe<SUP>2+</SUP><SUB>a</SUB>Fe<SUP>3+</SUP><SUB>b</SUB>Mg<SUB>c</SUB>Al<SUB>d</SUB>O<SUB>e</SUB>.nH<SUB>2</SUB>O. The black composite oxide particle is suitable as a black pigment for a coating material, an ink, toner particles, a rubber and a plastic, and is reduced with respect to the load on the environment and excellent in blackness.
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