METHOD FOR PRODUCING ZIRCONIUM TITANATE PARTICLE, ZIRCONIUM TITANATE, AND EXTERNAL ADDITIVE FOR TONER

PROBLEM TO BE SOLVED: To provide zirconium titanate particles capable of suitably used as an external additive for toner, and to provide a method for producing the same and an external additive composed of the particles.SOLUTION: A method for producing zirconium titanate particles, found as a single phase in the powder X-ray diffraction and having a primary particle diameter of 20-100 nm, includes: a step (I) of obtaining a solid zirconium titanate precursor by mixing a titanium compound and a zirconium compound in an aqueous medium; a step (II) of substituting water in the zirconium titanate precursor obtained in the step (I) with a hydrophilic solvent, and a step (III) of firing the zirconium titanate precursor obtained in the step (II) at 600 to 850°C.