Lithium tantalate substrate and method for producing same

Details Lithium tantalate substrate and method for producing same Lithium tantalate substrate and method for producing same

2004-10-07

2008-10-28

Kunemund, Robert M (Department: 1792)

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth with a subsequent step of heat treating...

C117S002000, C117S004000, C117S944000

Reexamination Certificate

active

07442250

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 106to 108Ωcm. 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.

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A.A. Ballman; “Growth of Piezoelectric and Ferroelectric Materials by the Czochralski Technique;”Journal of The American Ceramic Society—Discussions and Notes;vol. 48; No. 2; Mar. 31, 1964; p. 112./Discussed in the specification.

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