Piezoelectric ceramics
AssigneeTDK Corporation
InventorsMasakazu Hirose, Takeo Tsukada, Hitoshi Oka, Junji Terauchi
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Abstract
Piezoelectric ceramics include a bismuth layer compound containing MII, Bi, Ti, Ln and O, wherein MII 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 MIIBi4Ti4O15 typed crystals, and a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5. In the case where MII is Sr, a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030. Preferably, piezoelectric ceramics further include Y oxide.
Claims8
Piezoelectric ceramics comprising:
- compounds shaped in bismuth layer containing MII, Bi, Ti, Ln and O;
- and MIIBi4Ti4O15 typed crystals,
- wherein MII 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, and
- a mole ratio of Ln/(MII+Ln) is 0<Ln/(MII+Ln)<0.5, and a mole ratio of 4Bi/Ti is 4.000<4Bi/Ti≦4.030.
Piezoelectric ceramics comprising:
- compounds shaped in bismuth layer containing MII, Bi, Ti, Ln and O;
- MIIBi4Ti4O15 typed crystals;
- and
- Y oxide,
- wherein MII 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, and
- a mole ratio of Ln/(Ln+MII) is 0<Ln/(Ln+MII)<0.5.
Dependencies are inferred from the claim text.