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US5268342A
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Nonreducing dielectric ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1992-06-25
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Granted: 1993-12-07
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Expires: 2012-06-25
Abstract
Abstract A nonreducing dielectric ceramic composition that includes BaTi0 3 as a main component, the BaTi0 3 containing alkali metal oxides in an amount more than 0.04 weight % as impurities. One or more of the following rare earth metal oxides (Re 2 O 3 ): Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 ; and Co 2 O 3 in the following ratios: BaTiO 3 is 92.0-00.4 mol %; Re 2 O 3 is 0.3-4.0 mol %; and Co 2 O 3 is 0.3-4.0 mol %; the composition also includes the following subcomponents: 0.2-4.0 mol % BaO; 0.2-3.0 mol % of MnO; and 0.5-5.0 mol % of MgO. The composition may include 0.5-2.5 weight parts of oxide glass containing BaO-SrO-Li 2 O-SiO 2 incorporated with 100 weight parts for the above composition. The composition may also include 0.5-4.0 mol % CaTiO 3 , 0.5-3.5 mol % CaZrO 3 or one or both of NiO and Al 2 O 3 in an amount 0.3-3.0 mol %. Further, 0.5-2.5 weight parts of oxide glass containing BaO-SrO-Li 2 O-SiO 2 may be incorporated with 100 weight parts of the composition. SiO 2 in an amount of 0.2-3.0 mol % or one or both of NiO and Al 2 O 3 in an amount of 0.3-3.0 mol % may be incorporated in the composition. CaO or SrO may be substituted for BaO.
Inventors
- 👤 Toshiki Nishiyama
- 👤 Yukio Hamaji
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:34
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
164 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3- 4.0 mol %; and
Co.sub.2 O.sub.3 0.3- 4.0 mol %; and
______________________________________ b) subcomponents comprising BaO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mole % of the main components, in addition to the 100% mol of the main components and within the following ranges: ______________________________________
BaO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %; and
MgO 0.5-5.0 mol %.
______________________________________
Claim 2
Dependent Claim
164 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3- 4.0 mol %; and
Co.sub.2 O.sub.3 0.3- 4.0 mol %; and
______________________________________ b) subcomponents comprising BaO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mole % of the main components, in addition to the 100% mol of the main components and within the following ranges: ______________________________________
BaO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %; and
MgO 0.5-5.0 mol %.
______________________________________
Claim 3
Dependent Claim
43 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the non-reducing dielectric ceramic composition, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 4
Dependent Claim
67 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising CaTiO 3 as a subcomponent, the CaTiO 3 being present in the composition in an amount within the range of 0.5-4.0 mol %, and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the nonreducing dielectric ceramic composition, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 5
Dependent Claim
64 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising CaZrO 3 as a subcomponent, the CaZrO 3 being present in an amount within the range of 0.5-3.5 mol %, and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the nonreducing dielectric ceramic composition, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 6
Dependent Claim
31 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising SiO 2 as a subcomponent, the SiO 2 being present in an amount within the range of 0.2-3.0 mol %.
Claim 7
Dependent Claim
43 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising NiO, Al 2 O 3 or mixtures thereof as a subcomponent, the NiO, Al 2 O 3 or mixtures thereof being present in an amount within the range of 0.3-3.0 mol %.
Claim 8
Dependent Claim
76 words
A nonreducing dielectric ceramic composition according to claim 1, further comprising NiO, Al 2 O 3 or mixture thereof as a subcomponent, the NiO, Al 2 O 3 or mixture thereof being present in an amount within the range of 0.3-3.0 mol %, and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the nonreducing dielectric ceramic composition, the oxide glass containing BaO-SrO-LiO 2 -SiO 2 .
Claim 9
Dependent Claim
196 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3-4.0 mol %; and
Co.sub.2 O.sub.3 0.3-4.0 mol %; and
______________________________________ b) subcomponents comprising CaO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mol % of the main components, in addition to the 100 mol % of the main components and within the following ranges: ______________________________________
CaO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %;
MgO 0.5-5.0 mol %;
______________________________________ and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the main components and subcomponents, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 10
Dependent Claim
196 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3-4.0 mol %; and
Co.sub.2 O.sub.3 0.3-4.0 mol %; and
______________________________________ b) subcomponents comprising CaO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mol % of the main components, in addition to the 100 mol % of the main components and within the following ranges: ______________________________________
CaO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %;
MgO 0.5-5.0 mol %;
______________________________________ and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the main components and subcomponents, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 11
Dependent Claim
196 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3-4.0 mol %; and
Co.sub.2 O.sub.3 0.3-4.0 mol %; and
______________________________________ b) subcomponents comprising SrO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mol % of the main components, in addition to the 100 mol % of the main components and within the following ranges: ______________________________________
SrO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %;
MgO 0.5-5.0 mol %;
______________________________________ and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the main components and subcomponents, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
Claim 12
Dependent Claim
196 words
A nonreducing dielectric ceramic composition, comprising: a) 100 mole % of main components comprising Co 2 O 3 , BaTiO 3 containing alkali metal oxide impurities in an amount less than 0.04 weight %, at least one rare earth metal oxide having the general formula Re 2 O 3 and selected from the group consisting of Tb 2 O 3 , Dy 2 O 3 , Ho 2 O 3 and Er 2 O 3 , the main components being present in the composition in amounts within the following ranges: ______________________________________
BaTiO.sub.3 92.0-99.4 mol %;
Re.sub.2 O.sub.3 0.3-4.0 mol %; and
Co.sub.2 O.sub.3 0.3-4.0 mol %; and
______________________________________ b) subcomponents comprising SrO, MnO and MgO, the subcomponents being present in the composition in amounts, based upon 100 mol % of the main components, in addition to the 100 mol % of the main components and within the following ranges: ______________________________________
SrO 0.2-4.0 mol %;
MnO 0.2-3.0 mol %;
MgO 0.5-5.0 mol %;
______________________________________ and oxide glass in an amount within the range of 0.5-2.5 weight parts based upon 100 weight parts of the main components and subcomponents, the oxide glass containing BaO-SrO-Li 2 O-SiO 2 .
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