Method of preparing ferroelectric ceramics

Details Method of preparing ferroelectric ceramics Method of preparing ferroelectric ceramics

C - Chemistry, Metallurgy

04

B

31/112

C04B 35/46 (2006.01) C04B 35/48 (2006.01) C04B 35/50 (2006.01) C04B 35/51 (2006.01)

Patent

CA 1045370

METHOD OF PREPARING FERROELECTRIC CERAMICS ABSTRACT OF THE DISCLOSURE A process for preparing strengthened ferroelectric ceramics, which comprises sintering ceramic materials and then heat treating the sintered ceramics at a temperature from about 100°C to about 400°C lower than the final sintering temperature of ceramics, for about 1 to about 60 hrs., and then cooling at a rate from about 300°C to about 10°C per hour. Strengthened ferroelectric ceramics are obtained among the following ferro- electric ceramic compositions: I) Pb([B1]ATa1-A)O3-pbTiO3-pbZrO3, where [B1] is Mg, Zn, Cd, Sn, Mn, Fe, Co, and Ni when A=1/3 and [B1] is Li and Cu when A=1/4, II) Pb([B2]BTa1-B)O3-Pb([B3]CTa1-C)O3-PbTiO3-PbZrO3, where [B2] and [B3], [B2]?[B3], are Mg, Zn, Cd, Sn, Mn, Fe, Co and Ni when B and C=1/3, and [B2] and [B3], [B2]?[B3], are Li and Cu when B and C=1/4, III) Pb([B1]ATa1-A)O3PbTiO3-PbZrO3 with MnO2, where [B1] is Mg, Zn, Cd, Sn, Fe, Co and Ni when A=1/3, and [B1] is Li and Cu when A=1/4, and IV) Pb([B2]BTa1-B)O3-Pb([B3]CTa1-C)O3-PbTiO3-PbZrO3 with MnO2, where [B2] and [B3], [B2]?[B3], are Mg, Zn, Cd, Sn, Fe, Co and Ni when B and C=1/3, and [B2] and [B3], [B2]?[B3], are Li and Cu when B and C = 1/4.

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