Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
December 8, 2009
Patent Application Number
10574274
Date Filed
October 7, 2004
Patent Primary Examiner
Patent abstract
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 more than 108 to less than 1010 Ωcm. The substrate obtained has no pyroelectricity, 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.
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