Preparing submicron particle of (Pb1-x, Lax) (Zry, Ti1-y) 1-x/4O3; (PLZT) for ceramic condensers or chemical sensors has been achieved by using the oxide-metal alkoxide method and/or fining of PLZT with monopotassium dihydrogen phosphate into PLZT. Particles of less than 1μm diameter have not been obtained by the conventional mechanical grinding of ferroelectric ceramics. The dielectric constant of ceramics prepared by fining PLZT (x=0.09, y=0.65) with monopotassium dihydrogen phosphate was lower than that of the transparent PLZT consisted of a larger particle, but the temperature dependency of the dielectric constant value was depressed. Crystal structures of PLZT (x<0.2, y>0.65) were hardly influenced by an adding of KH2PO4.
