Compositions – Piezoelectric
Patent
1994-02-14
1995-08-22
Brunsman, David
Compositions
Piezoelectric
252 6254, 501134, 501136, 501137, C04B 3546, C04B 4148
Patent
active
054437466
ABSTRACT:
Ferroelectric composites are prepared by sol-gel derived procedures. The present invention utilizes the sol-gel process (1) to form a gel in a mold of the desired size and shape, (2) to dry the gel using a supercritical fluid extraction, (3) to sinter the dried gel to a crystalline ceramic, and finally (4) to impregnate the pores with a low loss polymer. The aerogel composition may be a barium titanate-based composition such as barium strontium titanate (BST). Making a ferroelectric aerogel composite provides a unique and novel means of fully exploiting the voltage- and/or frequency-tunable properties of certain compositions by maximizing their desirable properties and minimizing their undesirable characteristics such as loss at operational frequencies.
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Dougherty Thomas K.
Harris Norman H.
Pierce Brian M.
Townsend Carl W.
Brunsman David
Denson-Low W. K.
Hughes Aircraft Company
Lachman M. E.
Sales M. W.
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