| 摘要 |
<p>A black composite oxide particle which comprises a composite oxide having Fe, Mg and Al as metal components, wherein it 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 Fe3+/Fe2+ of 0.8 to 10; and a method for producing the black composite oxide particle. In an embodiment, it comprises a hydrated composite oxide represented by an empirical formula: Fe2+aFe3+bMgcAldOe · nH2O. 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.</p> |
