| 摘要 |
The present invention provides a piezoelectric ceramic and a piezoelectric element, which have a large dynamic d 33 (dynamic piezoelectric coefficient d 33 ), can be used even under an elevated temperature of 200°C, and exhibit a small variation between the dynamic d 33 at room temperature and the dynamic d 33 at 200°C. The piezoelectric ceramic of the present invention is characterized by containing 100 parts by mass of a bismuth layered compound as a main component and a total of 0.05 to 1 part by mass, in terms of oxides (MnO 2 and Fe 2 O 3 ), of at least one of Mn and Fe, the bismuth layered compound being represented by a compositional formula of Bi 4 Ti 3 O 12 ·²[(1-³)M1TiO 3 ·³M2M3O 3 ], wherein ² and ³ satisfy the following formulae: 0.405 ‰¤ ² ‰¤ 0.498 and 0 ‰¤ ³ ‰¤ 0.3, M1 represents at least one selected from Sr, Ba, Ca, (Bi 0.5 Na 0.5 ), (Bi 0.5 Li 0.5 ) and (Bi 0.5 K 0.5 ), M2 is at least one selected from Bi, Na, K and Li, and M3 is at least one of Fe and Nb. |
