Patent ID: 6620752
Filing Date: 2003-09-16
Classification: C01G,C01P,C04B,C30B,H01L

Abstract:
A process for preparing (1âˆ’x)Pb(Mg1/3Nb2/3)O3âˆ’xPbTiO3 where x=0.35 comprising,mixing (PbCO3)2Pb(OH)2 of a particle size less than about 6 &mgr;m, MgNb2O6 having a specific surface area of more than about 5 m2/g and fumed TiO2 having a specific surface area of more than about 30 m2/g to form a mixture, the (PbCO3)2Pb(OH)2, the fumed TiO2, and the MgNb2O6 present in amounts sufficient to produce a ratio of (PbCO3)2Pb(OH)2:MgNb2O6:fumed TiO2 of about 1:0.24:0.1 to about 1:0.0.27:0.12, milling the mixture in distilled water to produce a slurry having particle size of less than about 3 &mgr;m, heat treating the slurry to produce a dried precursor powder, grinding the dried precursor powder to a size less than about 200 &mgr;m, and sintering the dried precursor powder to a temperature of about 900Â° C. to about 1300Â° C. in an atmosphere selected from the group consisting of oxygen, nitrogen and air to produce a ceramic of (1âˆ’x)Pb(Mg1/3Nb2/3)O3âˆ’xPbTiO3 where x=0.35.