Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1991-09-03
1993-03-09
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
501134, 501135, 252 629, 252500, 252518, 252521, 423592, 423598, 423622, 423632, 264 65, 264 66, C04B 3546, C04B 3548, C04B 3549, H01B 100
Patent
active
051927233
ABSTRACT:
A method for producing a lead niobate-based complex oxide with an elevated proportion of pervoskite phase and lead niobate-based complex oxide produced by such method enables manufacture of small actuator or capacitor with an elevated dielectric constant k. Treatment of a raw material represented by a general formula Pb(A.sub.1/3 Nb.sub.#)x(ZN.sub.1/3 Nb.sub.2/3) yO.sub.3 or Pb(Fe.sub.1/2 Nb.sub.1/2)x(Zn.sub.1/3 Nb.sub.2/3) yO.sub.3 (wherein A is Mg or Ni; x is an atomic ratio in a range of 0-1; and y is an atomic ratio in a range of 1-0, with a relation x+y=1) and containing pyrochlore phase, under a high temperature of 500.degree.-1300.degree. C. and a high pressure of 1000-4000 kg/cm.sup.2, causes transition of pyrochlore phase into perovskite phase, thereby increasing the proportion of perovskite phase. Also treatment of a raw material represented by a general formula uPb(.sub.1/3 Nb.sub.2/3)O.sub.3 -vPbTiO.sub.3 (wherein u is an atomic ratio in a range of 0.5-1; and v is an atomic ratio in a range of 0.5- 0, with a relation u+v=1) and containing pyrochlore phase, under a high temperature of 500.degree.-1300.degree. C. and a high pressure of 1000-4000 kg/cm.sup.2 causes transition of pyrochlore phase into perovskite phase, thereby increasing the proportion of pervoskite phase.
REFERENCES:
patent: 4749668 (1988-06-01), Fujino et al.
patent: 4753905 (1988-06-01), Nishioka et al.
patent: 4959333 (1990-09-01), Mori et al.
Yonezawa et al., "The Crystal Structure and Piezoelectricity of the System Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 -PbTiO.sub.3 ", Jun. 3, 1969, Solid and Powder Metallurgy, vol. 16, No. 6, pp. 253-258.
Matsuo, Yoshihiro, "Synthesis of Perovskite-Type Complex Oxide Compound Pb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3," 1970, pp. 46-58.
Fujiu Takamitsu
Hattori Tetsuo
Muramatsu Kenichi
Tanaka Akira
Bell Mark L.
Marcheschi Michael
Nikon Corporation
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