A piezoelectric ceramic material is provided which can form a sintered piezoelectric ceramic compact having a low electromechanical coupling coefficient, a low resonant resistance and a low temperature dependence of the resonant frequency. The piezoelectric ceramic material is a solid solution having a primary component composed of PbTiO3, PbZrO3 and Pb(MaXMdY)O3, in which Ma is at least one bivalent element or trivalent element, and Md is at least one pentavalent element or hexavalent element, and the ratio X/Y of the Ma content X to the Md content Y is larger than the stoichiometric ratio. Preferred is Ma being Mn, Md being at least one of Nb, Sb, Ta and W, and when the contents of Mn, Nb, Sb, Ta and W are represented by A, B, C, D and E, respectively, 0.525≦A/(B+C+D+2E)≦1, and about 20 mole percent or less of the element Pb being replaced by at least one of Ca, Ba, Sr and La. Preferably, a sintered compact is obtained by firing this piezoelectric ceramic material in an oxygen atmosphere at an oxygen concentration of about 80% by volume or more is used in an unsaturated polarized state having an electromechanical coupling coefficient corresponding to about 80% or less of that of a sintered compact in a saturated polarized state.
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机译：提供一种压电陶瓷材料，其可以形成具有低机电耦合系数，低谐振电阻和谐振频率的低温度依赖性的烧结压电陶瓷成型体。压电陶瓷材料是一种固溶体，其主要成分包括PbTiO 3 ，PbZrO 3 和Pb（Ma X Md Y ）O 3 ，其中Ma为至少一种二价元素或三价元素，Md为至少一种五价元素或六价元素，且Ma含量的X / Y比X相对于Md含量Y大于化学计量比。优选的是，Ma为Mn，Md为Nb，Sb，Ta和W中的至少一种，并且当Mn，Nb，Sb，Ta和W的含量分别由A，B，C，D和E表示时，为0.525。 ＆ A /（B＆amp; C＆amp; D＆plus; 2E）＆lE; 1，并且大约20摩尔％或更少的元素Pb被Ca，Ba，Sr和La中的至少一种代替。优选地，获得烧结体。通过在氧气氛中以约80体积％或更高的氧浓度烧制该压电陶瓷材料而以不饱和极化态使用，其机电耦合系数等于饱和状态下烧结体的约80％或更低。极化状态。
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