Patent ID: 6120750
Filing Date: 2000-09-19
Classification: C01G,C01P

Abstract:
A method of producing a lead-containing complex oxide containing substantially no alkali metals, comprising:preparing a Zr/Ti precursor by (a) making a solution comprising a compound selected from the group consisting of an alkoxide of Ti, an acetylacetonate of Ti, an alkoxide of Zr and an acetylacetonate of Zr, (b) hydrolyzing said solution to form a reaction product and (c) drying said reaction product;mixing said Zr/Ti precursor, a lead-containing mineralizer and water to prepare a starting mixture having a pH of 8-12;subjecting said starting mixture to hydrothermal reaction to form a hydrothermal reaction product; andseparating, washing and drying said hydrothermal reaction product;wherein said method is conducted without adding an alkali metal to said starting mixture.