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US4226735A Expired / Lapsed US ⏱️ 0.0 years remaining

Dielectric ceramic composition and process for its production containing MgTiO3 and Pb3 O4 having a quantitative relationship

Assignee: Murata Manufacturing Co Ltd
•
Filing: 1978-11-15
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Granted: 1980-10-07
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Expires: 1998-11-15
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Abstract

Abstract A dielectric ceramic composition consists essentially of strontium titanate, magnesium titanate, bismuth oxide, titanium oxide, and lead oxide, these components being present in the following compositional proportion when expressed by the formulas, SrTiO 3 , MgTiO 3 , Bi 2 O 3 , TiO 2 and Pb 3 O 4 , respectively: ______________________________________ SrTiO 3 30.0-60.0 wt % MgTiO 3 2.0-32.0 wt % Bi 2 O 3 10.0-34.0 wt % TiO 2 3.0-15.0 wt % Pb 3 O 4 2.0-20.0 wt % Pb 3 O 4 /MgTiO 3 0.625-10.0 (weight ratio) ______________________________________ The composition exhibits high permittivity, small dielectric loss, small dependency of permittivity on temperature, and high dielectric breakdown voltage in combination, so that it makes it possible to produce physically small capacitors with large capacity and high rating voltage. The process for production of the composition is characterized by the use of MgTiO 3 and Pb 3 O 4 as respective sources of magnesium and lead.

Inventors

  • 👤 Yukio Sakabe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 13:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/475; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 54 words
A dielectric ceramic composition comsisting essentially of strontium titanate, magnesium titanate, bismuth oxide, titanium oxide and lead oxide, wherein respective components are present in the following compositional proportion when the components are expressed by SrTiO 3 , MgTiO 3 , Bi 2 O 3 , TiO 2 and Pb 3 O 4 , respectively:
Claim 2
Dependent Claim 54 words
A dielectric ceramic composition comsisting essentially of strontium titanate, magnesium titanate, bismuth oxide, titanium oxide and lead oxide, wherein respective components are present in the following compositional proportion when the components are expressed by SrTiO 3 , MgTiO 3 , Bi 2 O 3 , TiO 2 and Pb 3 O 4 , respectively:
Claim 3
Dependent Claim 115 words
A process for producing dielectric ceramic compositions with high permittivity, small dependency of permittivity on temperature, small dielectric loss and high dielectric breakdown voltage, in combination which comprises the steps of (a) mixing 30.0 to 60.0 wt% of strontium titanate, 2.0 to 3.0 wt% of magnesium titanate, 10.0 to 34.0 wt% of Bi 2 O 3 , 3.0 to 15.0 wt% of TiO 2 , 2.0 to 20.0 wt% of Pb 3 O 4 , the weight ratio of Pb 3 O 4 to MgTiO 3 being in the range of 0.625 to 10.0; and (b) firing the resulting mixture at a temperature in the range of 1180° to 1280° C. in an oxidizing atmosphere.
Claim 4
Dependent Claim 115 words
A process for producing dielectric ceramic compositions with high permittivity, small dependency of permittivity on temperature, small dielectric loss and high dielectric breakdown voltage, in combination which comprises the steps of (a) mixing 30.0 to 60.0 wt% of strontium titanate, 2.0 to 3.0 wt% of magnesium titanate, 10.0 to 34.0 wt% of Bi 2 O 3 , 3.0 to 15.0 wt% of TiO 2 , 2.0 to 20.0 wt% of Pb 3 O 4 , the weight ratio of Pb 3 O 4 to MgTiO 3 being in the range of 0.625 to 10.0; and (b) firing the resulting mixture at a temperature in the range of 1180° to 1280° C. in an oxidizing atmosphere.

References Cited (Backward Citations)

US3468680A Cited
US3869398A Cited
JPS4959298A Cited
US3951873A Cited
US4058404A Cited
JPS5095800A Cited
US4017320A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-10-07 1984-04-07 1984-10-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-10-07 1988-04-07 1988-10-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-10-07 1992-04-07 1992-10-07 $7700.00 Window Closed / Lapsed

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