| 发明名称 | Lead-free piezoelectric ceramic composition, piezoelectric element comprising same, knock sensor, and process for production of lead-free piezoelectric ceramic composition | ||
| 摘要 | A lead-free piezoelectric ceramic composition includes a first crystal phase of alkali niobate/tantalate type perovskite oxide having piezoelectric properties and a second crystal phase of A-Ti—B—O composite oxide (where the element A is an alkali metal; the element B is at least one of Nb and Ta; and the contents of the element A, the element B and Ti are not zero). Examples of the second crystal phase are those represented by A1−xTi1−xB1+xO5, and x preferably satisfies 0≦x≦0.15. | ||
| 申请公布号 | US9006959(B2) | 申请公布日期 | 2015.04.14 |
| 申请号 | US201113392030 | 申请日期 | 2011.01.14 |
| 申请人 | NGK Spark Plug Co., Ltd. | 发明人 | Yamazaki Masato;Matsuoka Takayuki;Yamagiwa Katsuya;Ohbayashi Kazushige |
| 分类号 | H01L41/187;H01L41/43;C04B35/462;C04B35/495;G01L23/22 | 主分类号 | H01L41/187 |
| 代理机构 | Sughrue Mion, PLLC | 代理人 | Sughrue Mion, PLLC |
| 主权项 | 1. A lead-free piezoelectric ceramic composition, comprising: a first crystal phase of alkali niobate/tantalate type perovskite oxide having piezoelectric properties; and a second crystal phase of A-Ti—B—O composite oxide having no piezoelectric properties (where the element A is an alkali metal; the element B is at least one of Nb and Ta; and the contents of the element A, the element B and Ti are not zero), wherein the alkali niobate/tantalate type perovskite oxide of the first crystal phase is represented by (KaNabLicCd)eDOf (wherein the element C is at least one alkaline-earth metal selected from Ca, Sr and Ba; the element D is at least one of Nb and Ta; a, b, c and d satisfy the conditions of 0<a≦0.6, 0<b≦0.6, 0<c≦0.2, 0<d≦0.1, 0.97≦e≦1.08 and a+b+c+d=1; and f is an arbitrary value that satisfies the condition of (a+b+c+2·d)·e+5≈2·f such that the perovskite oxide can be constituted by the first crystal phase), and wherein the A-Ti—B—O composite oxide of the second crystal phase is represented by A1−xTi1−xB1+xO5 (where x satisfies the condition of 0≦x≦0.15). | ||
| 地址 | Aichi JP | ||