发明名称 |
Piezoelectric porcelain composition |
摘要 |
Provided is a Sr2-xCaxNaNb5O15 type piezoelectric ceramic composition wherein the inhibition of cracking and an improvement in the piezoelectric characteristics are attained by improving the composition uniformity and the microstructure uniformity. In the basic Sr2-xCaxNaNb5O15 composition, the (Sr, Ca)/Na ratio is changed, whereby the occupancies of Sr, Ca and Na in lattices which constitute the tungsten-bronze type structure and into which Sr, Ca, and Na can enter are reduced to facilitate the entrance of Sr into the lattices and thus inhibit the formation of a secondary phase. Further, a predetermined amount of Al and/or Si is added to lower the sintering temperature and to make the microstructure uniform. Additionally, a predetermined amount of Mn is added to make the polarization easy. |
申请公布号 |
US8894873(B2) |
申请公布日期 |
2014.11.25 |
申请号 |
US201113813891 |
申请日期 |
2011.07.26 |
申请人 |
Taiyo Yuden Co., Ltd. |
发明人 |
Doshida Yutaka |
分类号 |
C04B35/495;C04B35/00;H01L41/187;H01L41/43;C04B35/626 |
主分类号 |
C04B35/495 |
代理机构 |
Law Office of Katsuhiro Arai |
代理人 |
Law Office of Katsuhiro Arai |
主权项 |
1. A piezoelectric porcelain composition wherein its main ingredient is a porcelain composition expressed by the formula (Sr2-xCax)1+y/4Na1−yNb5O15 wherein 0<x<0.3, and 0.1<y<0.6. |
地址 |
Tokyo JP |