Flaky zirconia type fine crystals and method for producing them

摘要

laky zirconia type fine crystals having a lamellar structure with the thickness of less than 500 A and with the size in the direction in parallel with the plane of layers of greater than five times of said thickness, and including flaky SO4 ion containing zirconia fine crystals, flaky hydrous zirconia fine crystals, monoclinic flaky zirconia fine crystals and tetragonal or cubic flaky zirconia fine crystals.