US4483933A
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Semiconductor ceramic composition
Assignee: Murata Manufacturing Co Ltd
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Filing: 1984-04-13
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Granted: 1984-11-20
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Expires: 2004-04-13
Abstract
Abstract A semiconductor ceramic composition of a barium titanate system comprises a main component containing a minor quantity of one or more semiconductor-forming elements, and additives of manganese oxides and silica incorporated therein, and is characterized by that the main component consists essentially of 30 to 95 mol % of BaTiO 3 , 3 to 25 mol % of CaTiO 3 , 1 to 30 mol % of SrTiO 3 and 1 to 50 mol % of PbTiO 3 . The contents of manganese oxides and silica are 0.03 to 0.15 mol %, preferably, 0.03 to 0.10 mol % in terms of Mn, and 0.5 to 5 mol % in terms of SiO 2 , respectively, with respect to one mole of the main component. One or more semiconductor-forming elements are selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and the content of the elements is 0.2 to 1.0 mol %.
Inventors
- 👤 Takashi Kobayashi
- 👤 Motoi Nishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:03
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/02; H01C7/022; H01C7/023; H01C7/025; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
A semiconductor ceramic composition of a barium titanate system having a specific resistance of 400 ohm-cm or less, consisting essentially of a main component containing a small amount of one or more semiconductor- forming elements, and additives of manganese oxide and silica, said main component consisting essentially of 30 to 95 mol % of BaTiO 3 , 3 to 25 mol % of CaTiO 3 , 1 to 30 mol % of SrTiO 3 and 1 to 50 mol % of PbTiO 3 , said semiconductor-forming elements being selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and being present in an amount of 0.2 to 1.0 mol %, wherein the content of manganese oxides is 0.03 to 0.10 mol % in terms of Mn with respect to one mole of the main component, and wherein the content of silica is 0.5 to 5 mol % in terms of SiO 2 with respect to one mole of the main component.
Claim 2
Dependent Claim
166 words
A semiconductor ceramic composition of a barium titanate system having a specific resistance of 400 ohm-cm or less, consisting essentially of a main component containing a small amount of one or more semiconductor- forming elements, and additives of manganese oxide and silica, said main component consisting essentially of 30 to 95 mol % of BaTiO 3 , 3 to 25 mol % of CaTiO 3 , 1 to 30 mol % of SrTiO 3 and 1 to 50 mol % of PbTiO 3 , said semiconductor-forming elements being selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and being present in an amount of 0.2 to 1.0 mol %, wherein the content of manganese oxides is 0.03 to 0.10 mol % in terms of Mn with respect to one mole of the main component, and wherein the content of silica is 0.5 to 5 mol % in terms of SiO 2 with respect to one mole of the main component.
Claim 3
Dependent Claim
81 words
A semiconductor ceramic composition according to claim 1 wherein the main component having a composition expressed by the general formula: (Ba.sub.1-x-y-z Ca.sub.x Sr.sub.y Pb.sub.z).sub.m TiO.sub.3 where x, y and z are respective mole fractions, 1-x-y-z is 0.30 to 0.95, x is 0.03 to 0.25, y is 0.01 to 0.30, z is 0.01 to 0.50 mol %, m is a mole ratio of (Ba 1-x-y-z Ca x Sr y Pb z ) to Ti and takes a value of 0.99 to 1.03.
Claim 4
Dependent Claim
43 words
A semiconductor ceramic composition according to claim 1 wherein said main component consisting essentially of 82 mol % of BaTiO 3 , 5 mol % of CaTiO 3 , 8 mol % of SrTiO 3 and 5 mol % of PbTiO 3 .
Claim 5
Dependent Claim
43 words
A semiconductor ceramic composition according to claim 1 wherein said main component consisting essentially of 67 mol % of BaTiO 3 , 20 mol % of CaTiO 3 , 8 mol % of SrTiO 3 and 5 mol % of PbTiO 3 .
Claim 6
Dependent Claim
43 words
A semiconductor ceramic composition according to claim 1 wherein said main component consisting essentially of 65 mol % of BaTiO 3 , 15 mol % of CaTiO 3 , 15 mol % of SrTiO 3 and 5 mol % of PbTiO 3 .
Claim 7
Dependent Claim
43 words
A semiconductor ceramic composition according to claim 1 wherein said main component consisting essentially of 52 mol % of BaTiO 3 , 15 mol % of CaTiO 3 , 8 mol % of SrTiO 3 and 25 mol % of PbTiO 3 .
Claim 8
Dependent Claim
43 words
A semiconductor ceramic composition according to claim 1 wherein said main component consisting essentially of 32 mol % of BaTiO 3 , 15 mol % of CaTiO 3 , 8 mol % of SrTiO 3 and 45 mol % of PbTiO 3 .
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