Compositions – Piezoelectric
Patent
1975-02-07
1976-06-15
Cooper, Jack
Compositions
Piezoelectric
42398, 106 733, C04B 3546, C04B 3548
Patent
active
039636305
ABSTRACT:
Fine crystalline powder, from 0.02 to 0.2 micron in average particle size, of a composition Pb(Zr.Ti)O.sub.3. Parts of Zr and Ti of the composition may be substituted for with Mn and Sb, Nb, and/or Ta. The powder is produced by preparing an acidic aqueous solution of the constituent metallic ions, neutralizing the solution to provide a suspension of hydroxides of the metals, and subjecting the suspension to hydrothermal reaction at 150.degree.-300.degree.C. The powder provides piezoelectric ceramics of a high sintered density without resorting to hot pressing.
REFERENCES:
patent: 2892955 (1959-06-01), Gulton
patent: 3352632 (1967-11-01), Sasaki
patent: 3666666 (1972-05-01), Haertling
patent: 3699044 (1972-10-01), Dosch et al.
patent: 3699045 (1972-10-01), Tsubovehi et al.
patent: 3708438 (1973-01-01), Levy
Akita Toshikazu
Iwase Keizo
Kiyama Masao
Ohno Tomeji
Takada Toshio
Cooper Jack
Nippon Electric Company Limited
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