US5688732A
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Dielectric ceramic compositions for microwave
Assignee: Electronics and Telecommunications Research Institute
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Filing: 1995-11-15
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Granted: 1997-11-18
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Expires: 2015-11-15
Abstract
Abstract The present invention relates to dielectric ceramic compositions for microwave applications consisting of BaO, PbO, Nd2O3, CeO2, La2O3 and TiO2 or consisting of compositions including these elements and having a composition formula (I). x(Ba1- alpha Pb alpha )O-y[Nd2O3(1- beta - gamma )CeO2( beta )La2O3( gamma )]-zTiO2(I)wherein mol %, 6</=x</=20, 10</=y</=20, 60</=z</=75, x+y+z=100; and 0< alpha </=0.5, 0</= beta </=0.2, 0</= gamma </=0.2 and 0<1- beta - gamma <1. These dielectric ceramic compositions for microwave applications have a dielectric constant above 90 at room temperature, a temperature coefficient at the resonant frequency within +5 ppm/ DEG C. and a quality factor above 5,000 at 1 GHz, they can be used as filters, as resonator dielectrics for microwave applications, as laminated ceramic capacitors, as dielectrics for electromagnetic wave impediment filters and as dielectrics for capacitors. Further, these compositions can reduce the problems of evaporation of lead oxides and bismuth oxides, and thus can reduce the use of elements harmful to human body.
Inventors
- 👤 Jung-Rae Park
- 👤 Tae-Hong Kim
- 👤 Suk-Jin Lee
- 👤 Sang-Seok Lee
- 👤 Tae-Goo Choi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:43
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4686; C04B35/4688; H01G4/1227
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
Dielectric ceramic compositions for microwave components comprising Nd 2 O 3 , TiO 2 , a compound selected from the group consisting of BaO and BaCO 3 , a compound selected from the group consisting of PbO and Pb 3 O 4 and at least one compound selected from the group consisting of CeO 2 and La 2 O 3 and having composition according to the formula (I): x(Ba.sub.1-α Pb.sub.α)O-y(Nd.sub.2 O.sub.3(1-β-γ) CeO.sub.2(β) La.sub.2 O.sub.3(γ))-zTiO.sub.2 (I) wherein, in mol %, 6≦x≦20, 10≦y≦20, 60≦z≦75, x+y+z=100, 0<α≦0.5, 0≦β≦0.2, 0≦γ≦0.2 and 0<1-β-γ<1.
Claim 2
Dependent Claim
88 words
Dielectric ceramic compositions for microwave components comprising Nd 2 O 3 , TiO 2 , a compound selected from the group consisting of BaO and BaCO 3 , a compound selected from the group consisting of PbO and Pb 3 O 4 and at least one compound selected from the group consisting of CeO 2 and La 2 O 3 and having composition according to the formula (I): x(Ba.sub.1-α Pb.sub.α)O-y(Nd.sub.2 O.sub.3(1-β-γ) CeO.sub.2(β) La.sub.2 O.sub.3(γ))-zTiO.sub.2 (I) wherein, in mol %, 6≦x≦20, 10≦y≦20, 60≦z≦75, x+y+z=100, 0<α≦0.5, 0≦β≦0.2, 0≦γ≦0.2 and 0<1-β-γ<1.
Claim 3
Dependent Claim
15 words
Dielectric ceramic compositions for microwave components according to claim 1, wherein the composition comprises BaO.
Claim 4
Dependent Claim
17 words
Dielectric ceramic compositions for microwave components according to claim 1, wherein the composition comprises BaCO 3 .
Claim 5
Dependent Claim
15 words
Dielectric ceramic compositions for microwave components according to claim 1, wherein the composition comprises PbO.
Claim 6
Dependent Claim
19 words
Dielectric ceramic compositions for microwave components according to claim 1, wherein the composition comprises Pb 3 O 4 .
Claim 7
Dependent Claim
29 words
Dielectric ceramic compositions for microwave components according to claim 1, wherein the compositions are sintered at a sintering temperature of 1250° to 1400° C. for 2 to 4 hours.
Claim 8
Dependent Claim
34 words
Dielectric ceramic compositions for microwave components according to claim 1, further comprising up to 1 wt. % of a compound selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
Claim 9
Dependent Claim
36 words
Dielectric ceramic compositions for microwave components according to claim 2, further comprising up to 1 wt. % of one or more compounds selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
Claim 10
Dependent Claim
36 words
Dielectric ceramic compositions for microwave components according to claim 3, further comprising up to 1 wt. % of one or more compounds selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
Claim 11
Dependent Claim
36 words
Dielectric ceramic compositions for microwave components according to claim 4, further comprising up to 1 wt. % of one or more compounds selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
Claim 12
Dependent Claim
36 words
Dielectric ceramic compositions for microwave components according to claim 5, further comprising up to 1 wt. % of one or more compounds selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
Claim 13
Dependent Claim
36 words
Dielectric ceramic compositions for microwave components according to claim 6, further comprising up to 1 wt. % of one or more compounds selected from the group consisting of CuO, ZnO, Bi 2 O 3 and MnO.
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