发明授权
- 专利标题: Piezoelectric ceramics
- 专利标题(中): 压电陶瓷
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申请号: US940219申请日: 1978-09-06
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公开(公告)号: US4243541A公开(公告)日: 1981-01-06
- 发明人: Hiroshi Takeuchi , Yukio Ito , Shigeru Jyomura , Kunio Yamashita , Kazuyuki Nagatsuma , Sakichi Ashida , Mitsuru Ishii
- 申请人: Hiroshi Takeuchi , Yukio Ito , Shigeru Jyomura , Kunio Yamashita , Kazuyuki Nagatsuma , Sakichi Ashida , Mitsuru Ishii
- 申请人地址: JPX
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX
- 优先权: JPX52-106606 19770907; JPX52-106607 19770907
- 主分类号: H01L41/187
- IPC分类号: H01L41/187 ; C04B35/46
摘要:
Piezoelectric ceramics containing PbO and TiO.sub.2 as its principal constituents, and further containing 0.5 to 3.7 mol-% of Nd.sub.2 O.sub.3 and 0.2 to 1.5 mol-% of MnO.sub.2. Since the piezoelectric ceramics is low in the dielectric constant and is especially small in the temperature coefficient of the delay of surface acoustic waves, it is suitable for a surface acoustic wave device. Piezoelectric ceramics in which 0.3 to 3.3 mol-% of In.sub.2 O.sub.3 is further added to the above-mentioned composition has a still smaller temperature coefficient of the delay of surface acoustic waves, and it is also possible to make this coefficient zero.