Dielectric ceramic composition

Assignee: Murata Manufacturing Co Ltd

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Filing: 1983-06-16

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Granted: 1984-11-27

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Expires: 2003-06-16

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Abstract

Abstract Dielectric ceramic composition containing by weight, 33% to 40% of PbTiO3; 6% to 35% of SrTiO3; 3% to 18% of CaTiO3; 0.5% to 10% of MgTiO3; 6% to 26% of Bi2O3; 3% to 15% of TiO2; 0.2% to 4% of ZnO; 0.2% to 5% of Nb2O5; 0.1% to 4% of CeO2 and 0.1% to 2% of Al2O3.

Inventors

👤 Yukio Sakabe

Bibliographic Details

Application Number —

Jurisdiction US

Data Source google_patents

Last Synchronized 2026-11-04 19:01

CPC Classifications

C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/472; C04B35/465; C04B35/47; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 106 words

A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. comprising PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________ PbTiO.sub.3 33% to 40% SrTiO.sub.3 6% to 35% CaTiO.sub.3 3% to 18% MgTiO.sub.3 0.5% to 10% Bi.sub.2 O.sub.3 6% to 26% TiO.sub.2 3% to 15% ZnO 0.2% to 4% Nb.sub.2 O.sub.5 0.2% to 5% CeO.sub.2 0.1% to 4% Al.sub.2 O.sub.3 0.1% TO 2% ______________________________________

Claim 2

Dependent Claim 106 words

Claim 3

Dependent Claim 108 words

A dielectric ceramic composition having a sintering temperature ranging from 1050° C. to 1160° C. consisting essentially of PbTiO 3 , SrTiO 3 , CaTiO 3 , MgTiO 3 , TiO 2 , Bi 2 O 3 , ZnO, Nb 2 O 5 , CeO 2 and Al 2 O 3 , wherein each constituent is present in the following amounts by weight: ______________________________________ PbTiO.sub.3 33% to 40% SrTiO.sub.3 6% to 35% CaTiO.sub.3 3% to 18% MgTiO.sub.3 0.5% to 10% Bi.sub.2 O.sub.3 6% to 26% TiO.sub.2 3% to 15% ZnO 0.2% to 4% Nb.sub.2 O.sub.5 0.2% to 5% CeO.sub.2 0.1% to 4% Al.sub.2 O.sub.3 0.1% TO 2% ______________________________________

Claim 4

Dependent Claim 108 words

Claim 5

Dependent Claim 41 words

The dielectric ceramic composition of claim 2 having a permittivity of at least 1000, a dielectric loss tangent of 1% or less, and a bias characteristic as a result of applying a direct-current voltage of 4 KV/mm of less than -20%.

References Cited (Backward Citations)

SU262201A1 Cited

US3410705A Cited

GB1029539A Cited

US3268783A Cited

US3869398A Cited

US3951873A Cited

JPS5170500A Cited

US4226735A Cited

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USPTO Annuity & Maintenance Windows

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1987-11-27	1988-05-28	1988-11-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1991-11-27	1992-05-28	1992-11-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1995-11-27	1996-05-28	1996-11-27	$7700.00	Window Closed / Lapsed

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