LITHIUM TANTALATE SUBSTRATE AND PROCESS FOR PRODUCING THE SAME

Title:

LITHIUM TANTALATE SUBSTRATE AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2005/038097

Kind Code:

A1

Abstract:

A process characterized in that an LT substrate obtained by forming lithium tantalate crystal grown by the Czochralski method into a substrate is buried in a powdery mixture of Al and Al₂O₃ and heat treated at a temperature maintained at 350 to 600°C to thereby obtain a lithium tantalate substrate whose volume resistivity is controlled so as to range from over 10⁸ to below 10¹⁰ &ohm ·cm. No pyroelectricity is observed on the thus obtained substrate, and the substrate undergoes a change from colorless transparency to colored opaqueness and satisfactorily has properties as a piezoelectric material.

Inventors:

KAJIGAYA TOMIO (JP)
KAKUTA TAKASHI (JP)

Application Number:

PCT/JP2004/015189

Publication Date:

April 28, 2005

Filing Date:

October 07, 2004

Export Citation:

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Assignee:

SUMITOMO METAL MINING CO (JP)
KAJIGAYA TOMIO (JP)
KAKUTA TAKASHI (JP)

International Classes:

C01G35/00; C30B29/30; C30B33/02; H01L37/02; H01L41/18; H01L41/39; (IPC1-7): C30B29/30; C30B33/02

Domestic Patent References:

WO2001033260A1

2001-05-10

Foreign References:

JPS6335499A	1988-02-16
JPS63210100A	1988-08-31
JPS539279A	1978-01-27
JP2004269300A	2004-09-30

Attorney, Agent or Firm:

Ueda, Shozo (25-Sankyo Bldg. 1-48-10, Higashi-Ikebukur, Toshima-ku Tokyo 13, JP)

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