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11. 发明授权

US4940681A Ferroelectric ceramic material 失效
标题翻译：铁电陶瓷材料
公开(公告)号：US4940681A
公开(公告)日：1990-07-10
申请号：US356135
申请日：1989-05-24
申请人： Yoshihisa Ushida , Nobuki Hirai , Hiroshi Mase
发明人： Yoshihisa Ushida , Nobuki Hirai , Hiroshi Mase
IPC分类号： C04B35/493 , H01L41/187
CPC分类号： C04B35/493 , H01L41/187
摘要： The present invention relates to a ferroelectric ceramic material which is a Perovskite solid said solution comprising a solid solution represented by the formulaPb.sub.1-a M.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y Zr.sub.z O.sub.3containing in the solution at least one oxide selected from the group A noted below and at least one oxide selected from the group B noted below, with the proviso that NiO or Fe.sub.2 O.sub.3 is necessarily contained.Group A: La.sub.2 O.sub.3, Bi.sub.2 O.sub.3 and Nd.sub.2 O.sub.3 ;Group B: NiO, Fe.sub.2 O.sub.3, SnO.sub.2 and Ta.sub.2 O.sub.5.The proposed ferroelectric ceramic material has a large piezoelectric strain constant d. The present invention is further directed to a ferroelectric ceramic which is a Perovskite solid solution comprising a solid solution represented by the formulaPb.sub.1-a M.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y Zr.sub.z O.sub.3wherein M is Ba or Sr, x+y+z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, containing in solution at least one oxide selected from group A noted below and at least one oxide selected from group B noted below, with the proviso that NiO, Fe.sub.2 O.sub.3 or Ta.sub.2 O.sub.5 is necessarily contained, the solid solution further containing in the solid solution MnO.sub.2.Group A: La.sub.2 O.sub.3, Bi.sub.2 O.sub.3 and Nd.sub.2 O.sub.3 ;Group B: NiO, ZnO, Fe.sub.2 O.sub.3, SnO.sub.2 and Ta.sub.2 O.sub.5.

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