Piezoelectric ceramic and method of manufacturing the same

Details Piezoelectric ceramic and method of manufacturing the same Piezoelectric ceramic and method of manufacturing the same

2007-03-28

2009-11-17

Koslow, C. Melissa (Department: 1793)

Compositions

Piezoelectric

C252S06290R, C310S311000, C264S653000, C501S134000

Reexamination Certificate

active

07618551

ABSTRACT:
Piezoelectric performance is improved in a piezoelectric ceramic having a perovskite-type crystal structure expressed by a general formula ABO3and the B-site element including niobium. The piezoelectric ceramic has a perovskite-type crystal structure in which plural octahedrons formed of oxygen are arranged to share vertices thereof and elements are located at a center of eight octahedrons and at a center of each octahedron; wherein an element located at the center of eight octahedrons is A-site element, an element located at the center of each octahedron is B-site element, and a general formula of the perovskite-type crystal structure is ABO3; the B-site element includes niobium (Nb); and bismuth (Bi) content in composition of the piezoelectric ceramic is 100 ppm by weight or less.

REFERENCES:
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Yiping Guo, et al., “Phase transitional behavior and piezoelectric properties of (Na0.5K0.5)NbO3-LiNbO3ceramics”, Applied Physics Letters, Nov. 2004, pp. 4121-4123, vol. 85, No. 18, Nagoya Institute of Technology, Nagoya, Japan.
Tadashi Takenaka, “Grain Orientation of Bismuth Layered-structure Ferroelectric Ceramics and Application to Piezoelectric and Pyroelectric Materials”, Kyoto University Doctor of Engineering Dissertation, 1985, pp. 101-124.
Yasuyoshi Saito, et al., “Lead-free piezoceramics”, Letter to Nature, Nature 432, Nov. 2004, pp. 84-87.

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