PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC ELEMENT

PROBLEM TO BE SOLVED: To provide an environmentally friendly piezoelectric composition including an excellent d, and to provide a piezoelectric element.SOLUTION: A piezoelectric composition composing a piezoelectric substrate 1 is represented by ((BiNa)Ba)(Ti(αβ}]O(1)(where, α is at least one kind of elements Mg, Ca, Sr, V, Mn, Fe, Co, Ni, Pd, Ag and Ge, β is at least one kind of elements V, Ta, Mo, W and Ru), and X, Y, m are molar ratios represented by 0.06≤X≤0.10, 0.0025≤Y≤0.1000 and 0.98≤m≤1.02.SELECTED DRAWING: Figure 1 【課題】優れたｄ３３を備える環境配慮型の圧電組成物および圧電素子を提供する。【解決手段】圧電基板１を構成する圧電組成物は、［｛Ｂｉ０．５Ｎａ０．５｝（１−Ｘ）ＢａＸ］ｍ［Ｔｉ（１−Ｙ）｛α１／３β２／３｝Ｙ］Ｏ３（１）（但し、α＝Ｍｇ、Ｃａ、Ｓｒ、Ｖ、Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ、Ｐｄ、Ａｇ、Ｇｅの少なくとも１種以上の元素かつ、β＝Ｖ、Ｔａ、Ｍｏ、Ｗ、Ｒｕの少なくとも１種以上の元素）で表され、Ｘ、Ｙ、ｍがモル比で０．０６≦Ｘ≦０．１０かつ、０．００２５≦Ｙ≦０．１０００かつ、０．９８≦ｍ≦１．０２で表される。【選択図】図１