Title:
圧電磁器
Document Type and Number:
Japanese Patent JP4001357
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a piezoelectric ceramic which can obtain large Qmax and is excellent from a view point of pollution reduction, environmental protection and ecological protection. SOLUTION: The piezoelectric ceramic incorporates a ceramic composition containing a pyrochlore type oxide and a perovskite type oxide. As the pyrochlore type oxide, (Ba0.52 Sr0.28 Ca0.2 )2 Nb2 O7 or the like can be cited and as the perovskite type oxide, NaNbO3 or the like can be cited. Composition ratio of the pyrochlore type oxide to the perovskite type oxide is preferably within a range of 0.005<=x<=0.04 by mole ratio when expressed by xA+(1-x)B (wherein A is pyrochlore type oxide and B is perovskite type oxide). Thereby Qmax can be improved and stable oscillation can be obtained.
Inventors:
Taiji Miyauchi
Ishiyama Tamotsu
Masaru Nanao
Ishiyama Tamotsu
Masaru Nanao
Application Number:
JP2001146257A
Publication Date:
October 31, 2007
Filing Date:
May 16, 2001
Export Citation:
Assignee:
tdk Corporation
International Classes:
C04B35/00; C04B35/495; H01L41/187
Domestic Patent References:
| JP2001053575A |
Attorney, Agent or Firm:
Yasushi Santanzaki
Yoichiro Fujishima
Yoichiro Fujishima