Lithium tantalate substrate and method for producing same

摘要

A lithium tantalate substrate obtained by working in the state of a substrate a lithium tantalate crystal grown by the Czochralski method is buried in a mixed powder of Al and Al₂O₃, followed by heat treatment carried out at a temperature kept to from 350 to 600° C, to manufacture a lithium tantalate substrate having volume resistivity which has been controlled within the range of from 10⁶ to 10⁸ Omegacm. The substrate obtained has no piezoelectricity, and it can be made colored and opaque from a colorless and transparent state and also sufficiently has the properties required as a piezoelectric material.