| 摘要 |
<p>Piezoelectric ceramics include a bismuth layer compound containing M<II>, Bi, Ti, Ln and O, wherein M<II> represents at least one element selected from the group consisting of Sr, Ba and Ca, and Ln represents at least one element selected from the group consisting of lanthanoids. The piezoelectric ceramics include M<II>Bi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+M<II>) is 0 < Ln/(Ln+M<II>) < 0.5. In the case where M<II> is Sr, a mole ratio of 4Bi/Ti is 4.000 < 4Bi/Ti ≤ 4.030. Preferably, piezoelectric ceramics further include Y oxide. <IMAGE></p> |
