Piezoelectric single crystal ingot, producing method therefor and piezoelectric single crystal device
AssigneeJfe Mineral Company, Ltd.
InventorMitsuyoshi Matsushita
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Abstract
A piezoelectric single crystal ingot is produced by the Bridgman method and contains a relaxor having a composition of Pb(Mg, Nb)O3 and lead titanate having a composition of PbTiO3. In the piezoelectric single crystal ingot, the compositional fraction of lead titanate does not vary monotonically in the growth direction of a single crystal and the variation of the compositional fraction thereof is within the range of ±2.0 mole percent over a length of 30 mm or more. A piezoelectric single crystal device is produced from the piezoelectric single crystal ingot.
Claims16
A piezoelectric single crystal ingot produced by the Bridgman method comprising at least a relaxor having a composition of Pb(Mg, Nb)O3;
- and lead titanate having a composition of PbTiO3, wherein the piezoelectric single crystal ingot has a compositional fraction of the lead titanate which does not vary monotonically in a growth direction of a single crystal and a variation of the compositional fraction which is within the range of ±2.0 mole percent over a length of 30 mm or more.
Dependencies are inferred from the claim text.