US5356844A
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Dielectric ceramic composition and dielectric resonator
Assignee: Kyocera Corp
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Filing: 1993-06-23
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Granted: 1994-10-18
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Expires: 2013-06-23
Abstract
Abstract A dielectric ceramic composition which contains a rare earth element (Ln), Al, Ca and Ti as metal elements and which when these components are expressed in terms of a mole ratio as aLn2Ox.bAl2O3. cCaO.dTiO2, the values of a, b, c, d and x satisfy a+b+c+d=1, 0.056</=a</=0.214, 0.056</=b</=0.214, 0.286</=c</=0.500, 0.230</=d</=0.470, and 3</=x</=4. The dielectric having the above composition is disposed between a pair of input and output terminals to constitute a dielectric resonator. The dielectric ceramic composition exhibits such dielectric properties as a large dielectric constant at high frequencies, a large Q-value and a small temperature coefficient of resonance frequency. Satisfactory properties are exhibited when the dielectric ceramic composition is used for a resonator or as a material of circuit board for high-frequency applications.
Inventors
- 👤 Seiichiro Hirahara
- 👤 Nobuyoshi Fujikawa
- 👤 Shinichi Enami
- 👤 Toyomi Nishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:43
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C01; C01G; C01G23/00; C01G23/003; C04B35/478; H; H01; H01P; H01P7/00; H01P7/10; C01P; C01P2006/00; C01P2006/40; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3203; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3217; C04B2235/3224; C04B2235/3225; C04B2235/3227; C04B2235/3229; C04B2235/3231; C04B2235/3239; C04B2235/3241; C04B2235/3244; C04B2235/3251; C04B2235/3258; C04B2235/3262; C04B2235/327; C04B2235/3275; C04B2235/3277; C04B2235/3279; C04B2235/3281; C04B2235/3284; C04B2235/3287; C04B2235/3293; C04B2235/3294; C04B2235/3296; C04B2235/34; C04B2235/3409; C04B2235/3418; C04B2235/40; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/60; C04B2235/602; C04B2235/6021; C04B2235/604
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
A dielectric ceramic composition expressed by the following formula aLn.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Ln denotes a rare earth element, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4.
Claim 2
Dependent Claim
39 words
A dielectric ceramic composition expressed by the following formula aLn.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Ln denotes a rare earth element, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4.
Claim 3
Dependent Claim
37 words
A dielectric ceramic composition according to claim 1, wherein the rare earth element (Ln) in said formula is one selected from the group consisting of Nd, Y, La, Ce, Pr, Sm, Eu, Gd, Dy, Er, and Yb.
Claim 4
Dependent Claim
31 words
A dielectric ceramic composition according to claim 1 wherein a, b, c, d and x in said formula, are numerals satisfying the following relationships: a+b+c+d=1, 0.078≦a≦0.1166 0.078≦b≦0.1166 0.390≦c≦0.47, 0.340≦d≦0.422, and 3≦x≦4.
Claim 5
Dependent Claim
32 words
A dielectric ceramic composition expressed by the following formula: aNd.sub.2 O.sub.3.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein a, b, c, and d are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x ≦4.
Claim 6
Dependent Claim
32 words
A dielectric ceramic composition expressed by the following formula: aNd.sub.2 O.sub.3.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein a, b, c, and d are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x ≦4.
Claim 7
Dependent Claim
78 words
A dielectric ceramic composition expressed by the following formula aLm.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Lm denotes a combination of Nd and other rare earth element selected from the group consisting of Y, La, Ce, Pr, Sm, Eu, Gd, Dy, Er and Yb, said Nd and other rare earth element being present at an atomic ratio of 9:1 to 1:9, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4.
Claim 8
Dependent Claim
78 words
A dielectric ceramic composition expressed by the following formula aLm.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Lm denotes a combination of Nd and other rare earth element selected from the group consisting of Y, La, Ce, Pr, Sm, Eu, Gd, Dy, Er and Yb, said Nd and other rare earth element being present at an atomic ratio of 9:1 to 1:9, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4.
Claim 9
Dependent Claim
141 words
A dielectric ceramic composition comprising (A) a major component expressed by the following formula: aLn.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Ln denotes a rare earth element, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4 and (B) a finite damount up to 6% by weight, based on the main component, of a minor component selected from the group consisting of ZnO, NiO, SnO 2 , Co 3 O 4 , MnCO 3 , ZrO 2 , WO 3 , LiCO 3 , Rb 2 CO 3 , Sc 2 O 3 , V 2 O 5 , CuO, SiO 2 , MgCO 2 , Cr 2 O 3 , B 2 O 3 , GeO 2 , Sb 2 O 5 , Nb 2 O 5 and Ta 2 O 5 .
Claim 10
Dependent Claim
141 words
A dielectric ceramic composition comprising (A) a major component expressed by the following formula: aLn.sub.2 O.sub.x.bAl.sub.2 O.sub.3.cCaO.dTiO.sub.2 wherein Ln denotes a rare earth element, and a, b, c, d and x are numerals satisfying the following relationships: a+b+c+d=1, 0.056≦a≦0.214, 0.056≦b≦0.214, 0.286≦c≦0.500, 0.230<d<0.470 and 3≦x≦4 and (B) a finite damount up to 6% by weight, based on the main component, of a minor component selected from the group consisting of ZnO, NiO, SnO 2 , Co 3 O 4 , MnCO 3 , ZrO 2 , WO 3 , LiCO 3 , Rb 2 CO 3 , Sc 2 O 3 , V 2 O 5 , CuO, SiO 2 , MgCO 2 , Cr 2 O 3 , B 2 O 3 , GeO 2 , Sb 2 O 5 , Nb 2 O 5 and Ta 2 O 5 .
Claim 11
Dependent Claim
39 words
A dielectric ceramic composition according to claim 6 wherein said minor component is Nb 2 O 5 or Ta 2 O 5 and is present in an amount of 1 to 4% by weight based on the major component.
Claim 12
Dependent Claim
25 words
The dielectric ceramic composition of claim 5 wherein said Nd and other rare earth elements are present at an atomic ratio of 9:1 to 5:5.
References Cited (Backward Citations)
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