Flaky zirconia type fine crystals having a lamellar structure with a thickness of less than 500 ANGSTROM and a size in a direction parallel to the plane of lamellar layers of greater than five times that of the thickness, 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. These crystals may be used in making piezoelectric ceramics.
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