Lead-free piezoelectric ceramic composition wherin Cu is...

Details Lead-free piezoelectric ceramic composition wherin Cu is... Lead-free piezoelectric ceramic composition wherin Cu is...

2005-04-26

2005-04-26

Koslow, C. Melissa (Department: 1755)

Compositions

Piezoelectric

C501S134000

Reexamination Certificate

active

06884364

ABSTRACT:
A lead-free piezoelectric ceramic composition wherein a suitable amount of Cu is contained in a perovskite compound of a non-stoichiometric composition represented by a formula (KxA1-x)y(Nb1-zBz)O3, wherein “A” represents at least one of Na and Bi, while “B” represents at least one of Ta and Ti, and wherein 0<x≦1, 0<y<1, and 0≦z≦1, so that by-products such as KaCubNbcOdand KaCubTacOdare produced as a result of reaction of (Nb1-zBz) with Cu in the process of calcination of a starting material, and the by-products restrict melting and abnormal grain growth of (KxNa1-x)(Nb1-zTaz) O3during firing of a calcined body, thereby improving sinterability of the fired body, while restricting volatilization of alkali components and melting of KNbO3, thereby increasing the density and improving the piezoelectric properties of the fired body. The ceramic composition is prepared by firing a starting composition including the perovskite composition as a primary component, and a secondary component in the form of at least one of compounds KaCubNbcOd, KeCufTagOhand KiCujTikOl.

REFERENCES:
patent: 6387295 (2002-05-01), Saito
patent: A 2000-313664 (2000-11-01), None
OM. Matubara., W. Sakamoto, T. Yogo and S. Hirano, “Fabriction and characterization of lead-free KxNai-XnbyTa1-yO3 piezoelectric ceramics”, Mar. 24, 2002, 2 pgs, Preprints of Annual Meeting of The Ceramic Sociey of Japan, 2000.

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