Piezoelectric ceramic composition

Details Piezoelectric ceramic composition Piezoelectric ceramic composition

1998-02-24

1999-09-21

Koslow, C. Melissa

Compositions

Piezoelectric

501134, 501135, H01L 4118

Patent

active

059549947

ABSTRACT:
Improved are the piezoelectric characteristics of conventional ceramics of (Ba.sub.1-x Sr.sub.x).sub.2 NaNb.sub.5 O.sub.15 where 0.ltoreq.x.ltoreq.1, and provided is a novel piezoelectric ceramic composition which does not contain lead and which can be practiced industrially as a material for piezoelectric ceramic devices such as piezoelectric ceramic filters, etc. The piezoelectric ceramic composition comprises, as the essential component, a ceramic component of the general formula, (1-y)(Ba.sub.1-x Sr.sub.x)Nb.sub.2 O.sub.6 --yNaNbO.sub.3 where 0.ltoreq.x.ltoreq.1 and 0.15.ltoreq.y<1/3. Preferably, the composition contains, as the side component, at least one oxides of Mn, Cr, W, Si, Mo, Ni, Co, Sn, Mg, Sb, Ti, Zr and Fe, in a total amount of not larger than about 5% by weight in terms of MnO.sub.2, Cr.sub.2 O.sub.3, WO.sub.3, SiO.sub.2, MoO.sub.3, NiO, Co.sub.2 O.sub.3, SnO.sub.2, MgO, Sb.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2 and Fe.sub.2 O.sub.3, respectively.

REFERENCES:
patent: 4248727 (1981-02-01), Kawashima et al.
patent: 5763346 (1998-06-01), Minamikawa et al.
Kimura et al, "Temperature Characteristics of (Ba1-xSrx)NaNb5O15 Ceramics", Jpn. J. Appl. Phys., vol. 36 (9b) part 1, 6051-54. Sep. 1997.
"Ferroelectric Properties of Tungsten Bronze Morphotropic Phase Boundary Systems"; J.R. Oliver: J. Am. Ceram. Soc., vol. 72, No. 2, 1989, pp. 202-211, XP002072803. no month.
JP 09 165 262 A (Matsushita Denki Sangyo KK); Jun. 24, 1997 Abstract, Derwent Publications Ltd.
JP 55 075 965 A (Matsushita Elec. Indus. Co. Ltd.); Jun. 7, 1980 Abstract, Derwent Publications Ltd.

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