| abstract |
Provided is a piezoelectric ceramic composition which is an effective material formed mainly of SrBi 2 Nb 2 O 9 containing no lead or containing a small amount, and having an improved Q max at an appropriate level for practical use. In a piezoelectric ceramic composition mainly composed of a bismuth-based layer mixture containing Sr, Bi, Nb and oxygen, the molar ratio of Sr, Bi, and Nb contained in the bismuth-based layer mixture as a main component is expressed as a: b: c. Satisfies the relationship represented by 0.275 ≦ a / c <0.5 and 4 ≦ (2a + 3b) /c≦4.5. |