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US4704373A Expired / Lapsed US ⏱️ 0.0 years remaining

Dielectric ceramic composition and process for producing the same

Assignee: Niterra Co Ltd
•
Filing: 1986-10-29
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Granted: 1987-11-03
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Expires: 2006-10-29
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Abstract

Abstract A dielectric ceramic composition is disclosed, comprising as three components lead nickel niobate, lead titanate, and lead magnesium iron tungstate, wherein the composition in terms of the three components is represented by the formula X[Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 ].Y[PbTiO.sub.3 ].Z[Pb(Mg.sub.1/4 Fe 1/4 W 1/2 )O 3 ] wherein X+Y+Z=1.00, X, Y, and Z are within the polyhedral area formed by lines connecting points a (X=0.78, Y=0.20, Z=0.02), b (X=0.50, Y=0.20, Z=0.30), c (X=0.40, Y=0.30, Z=0.30), d (X=0.50, Y=0.40, Z=0.10), and e (X=0.58, Y=0.40, Z=0.02) of an X-Y-Z ternary phase diagram. The composition can be sintered at a relatively low temperature, has a high dielectric constant, and is useful as a material for condensers and electrostriction elements.

Inventors

  • 👤 Takeo Kinoshita
  • 👤 Hideyuki Ikoma
  • 👤 Tsutomu Tsunooka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 17:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 83 words
A dielectric ceramic composition comprising as three components lead nickel niobate, lead titanate, and lead mangesium iron tungstate, wherein the composition in terms of the three components is represented by the formula X[Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 ].Y[PbTiO.sub.3 ].Z[Pb(Mg.sub.1/4 Fe.sub.1/4 W.sub.1/2)O.sub.3 ] wherein X+Y+Z=1.00, and X, Y, Z are within the polyhedral area formed by lines connecting points a (X=0.78, Y=0.20, Z=0.02), b (X=0.50, Y=0.20, Z=0.30), c (X=0.40, Y=0.30, Z=0.30), d (X=0.50, Y=0.40, Z=0.10), and e (X=0.58, Y=0.40, Z=0.02) of a ternary phase diagram of X-Y-Y.
Claim 2
Dependent Claim 83 words
A dielectric ceramic composition comprising as three components lead nickel niobate, lead titanate, and lead mangesium iron tungstate, wherein the composition in terms of the three components is represented by the formula X[Pb(Ni.sub.1/3 Nb.sub.2/3)O.sub.3 ].Y[PbTiO.sub.3 ].Z[Pb(Mg.sub.1/4 Fe.sub.1/4 W.sub.1/2)O.sub.3 ] wherein X+Y+Z=1.00, and X, Y, Z are within the polyhedral area formed by lines connecting points a (X=0.78, Y=0.20, Z=0.02), b (X=0.50, Y=0.20, Z=0.30), c (X=0.40, Y=0.30, Z=0.30), d (X=0.50, Y=0.40, Z=0.10), and e (X=0.58, Y=0.40, Z=0.02) of a ternary phase diagram of X-Y-Y.
Claim 3
Dependent Claim 29 words
A dielectric ceramic composition as in claim 1, wherein said composition further contains manganese dioxide in an amount of 0.02 to 0.04% by weight based on a ternary component.

References Cited (Backward Citations)

US4450240A Cited
JPS5918155A Cited
JPS59196503A Cited
JPS6033257A Cited
JPS6049501A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-11-02 1991-05-04 1991-11-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-11-02 1995-05-04 1995-11-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-11-02 1999-05-04 1999-11-03 $7700.00 Window Closed / Lapsed

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