Crystal-oriented ceramics, piezoelectric ceramics using the same

Details Crystal-oriented ceramics, piezoelectric ceramics using the same Crystal-oriented ceramics, piezoelectric ceramics using the same

1998-08-20

2000-07-25

Koslow, C. Melissa

Compositions

Piezoelectric

252 629PZ, 501134, 501135, 501137, 501 12C, 428697, 264437, 264667, H01L 41187, C04B 35622, C04B 35475, C04B 35491, C04B 35495

Patent

active

060933380

ABSTRACT:
A crystal-oriented ceramic has an isotropic or pseudoisotropic perovskite-type-structure of not smaller than 10% in Lotgering orientation degree. The ceramic may contain at least one of Bi, Sr and Ca. A host material, a raw material capable of producing a guest material and an additive having the ability of converting a host material into a guest material are mixed and roll-pressed, and sintered under heat to give the crystal-oriented ceramic as a large-sized and bulky material. This crystal-oriented ceramic has good crystal orientation-dependent characteristics including piezoelectricity, pyroelectricity, ionic conductivity, giant magneto-resistivity effect, etc. This crystal-oriented ceramic can be produced by orienting epitaxially the polycrystals of an isotropic or pseudoisotropic perovskite oxide according to the orientation of the crystal plane or axis of a host material. The ceramic can be applied to an inexpensive and large-sized device. The host material may be a magnetoplumbite-type-structured or Sr.sub.2 Nb.sub.2 O.sub.7 -type-structured material, and may be composed of morphologically-anisotropic grains.

REFERENCES:
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Derwent Abstract, AN 81-29640D, JP 56-021810, Feb. 28, 1981.
Derwent Abstract, AN 83-01049K, JP 88024950, May 23, 1988.
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Derwent Abstract, AN 82-64354E, JP 88043340, Aug. 30, 1988.
Derwent Abstract, AN 82-66865E, JP 88043341, Aug. 30, 1988.
Hidenori Watanabe, et al., J. Am. Ceram. Soc., vol., 72, No. 2, pp. 289 to 293, "Particle Orientation During Tape Casting in the Fabrication of Grain-Oriented Bismuth Titanate", 1989.
Seung-Eek Park, et al., J. Appl. Phys., vol. 82, No. 4, pp. 1804 to 1811, "Ultrahigh Strain and Piezoelectric Behavior in Relaxor Based Ferroelectric Single Crystals", Aug. 15, 1997.

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