US5059566A
Expired / Lapsed
US
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High-dielectric constant ceramic composite and ceramic capacitor elements
Assignee: Toshiba Corp
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Filing: 1989-12-27
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Granted: 1991-10-22
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Expires: 2009-12-27
Abstract
Abstract A high-dielectric constant ceramic composite is provided in which an appropriate amount of glass component is added to a composite of the BaTiO 3 -PbMO 3 group having a low temperature coefficient in the dielectric constant thereof. The added glass component serves to maintain the satisfactory properties of the ceramic composite even after various types of reliability tests.
Inventors
- 👤 Hideyuki Kanai
- 👤 Yohachi Yamashita
- 👤 Osamu Furukawa
- 👤 Mitsuo Harata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:35
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1218; H01G4/1227; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/076; C03C3/089; C03C3/091; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/495; C04B35/497; C04B35/499; H01B; H01B3/00; H01B3/02; H01B3/12; H01G4/1254; H01G4/129; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
128 words
A high-dielectric constant ceramic composite comprising: a lead-based perovskite compound as a major component; and a glass component added to said perovskite compound, said glass component including the following constituents B 2 O 3 of about 10 wt % to about 80 wt %, SiO 2 of about 10 wt % to about 60 wt %, Al 2 O 3 of about 2 wt % to about 20 wt %, BaO of about 2 wt % to about 20 wt %, and MgO of about 2 wt % to about 20 wt %, wherein the total amount of said constituents equals 100 wt %, and wherein the amount of said glass component added to said perovskite compound is between about 0.005 wt % and about 1.0 wt %.
Claim 2
Dependent Claim
128 words
A high-dielectric constant ceramic composite comprising: a lead-based perovskite compound as a major component; and a glass component added to said perovskite compound, said glass component including the following constituents B 2 O 3 of about 10 wt % to about 80 wt %, SiO 2 of about 10 wt % to about 60 wt %, Al 2 O 3 of about 2 wt % to about 20 wt %, BaO of about 2 wt % to about 20 wt %, and MgO of about 2 wt % to about 20 wt %, wherein the total amount of said constituents equals 100 wt %, and wherein the amount of said glass component added to said perovskite compound is between about 0.005 wt % and about 1.0 wt %.
Claim 3
Dependent Claim
18 words
The composite of claim 1, wherein the glass component further comprises 50 wt % or less of PbO.
Claim 4
Dependent Claim
17 words
The composite of claim 1, wherein said perovskite compound comprises Pb(Zn 1/3 Nb 2/3 )O 3 .
Claim 5
Dependent Claim
39 words
The composite of claim 1, wherein said perovskite compound includes at least one of Pb(Mg1/3Nb2/3)3 and Pb(Zn1/3Nb2/3)O3 by 50 mol % at a minimum, and said Pb is partially substituted by at least one of Ba, Sr and Ca.
Claim 6
Dependent Claim
147 words
The composite of claim 1, wherein said perovskite compound of the Pb group has a part of the Pb being substituted by at least one of Ba and Sr by about 1 mol % to about 35 mol %, the part of the Pb being defined in such a manner that when said perovskite compound is represented by the general expression of xPb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 --yPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --zPbTiO.sub.3, three components of which are shown as apexes x, y and z in a prescribed three-element chart, the part of the Pb is limited to the area surrounded by lines a--b, b--c, c--d and d--a including those points on the lines except on the line a--b, where the respective points a, b, c and d are determined as follows, a (x=0.50, y=0.00, and z=0.50), b (x=1.00, y=0.00, and z=0.00), c (x=0.20, y=0.80, and z=0.00), and d (x=0.05, y=0.90, and z=0.05).
Claim 7
Dependent Claim
20 words
The composite of claim 1, wherein said glass component also includes SrO of about 20 wt % at a maximum.
Claim 8
Dependent Claim
20 words
The composite of claim 1, wherein said glass component also includes CaO of about 20 wt % at a maximum.
Claim 9
Dependent Claim
132 words
A capacitor element having a high-dielectric constant ceramic composite comprising: a lead-based perovskite compound as a major component; and a glass component added to said perovskite compound, said glass component including the following constituents B 2 O 3 of about 10 wt % to about 80 wt %, SiO 2 of about 10 wt % to about 60 wt %, Al 2 O 3 of about 2 wt % to about 20 wt %, BaO of about 2 wt % to about 20 wt %, and MgO of about 2 wt % to about 20 wt %, wherein the total amount of said constituents equals 100 wt %, and wherein the amount of said glass component added to said perovskite compound is between about 0.005 wt % and about 1.0 wt %.
Claim 10
Dependent Claim
132 words
A capacitor element having a high-dielectric constant ceramic composite comprising: a lead-based perovskite compound as a major component; and a glass component added to said perovskite compound, said glass component including the following constituents B 2 O 3 of about 10 wt % to about 80 wt %, SiO 2 of about 10 wt % to about 60 wt %, Al 2 O 3 of about 2 wt % to about 20 wt %, BaO of about 2 wt % to about 20 wt %, and MgO of about 2 wt % to about 20 wt %, wherein the total amount of said constituents equals 100 wt %, and wherein the amount of said glass component added to said perovskite compound is between about 0.005 wt % and about 1.0 wt %.
Claim 11
Dependent Claim
19 words
The capacitor element of claim 8, wherein the glass component further comprises 50 wt % or less of PbO.
Claim 12
Dependent Claim
18 words
The capacitor element of claim 8, wherein said perovskite compound comprises Pb(Zn 1/3 Nb 2/3 )O 3 .
Claim 13
Dependent Claim
21 words
The capacitor element of claim 8, wherein said glass component also includes SrO of about 20 wt % at a maximum.
Claim 14
Dependent Claim
21 words
The capacitor element of claim 8, wherein said glass component also includes CaO of about 20 wt % at a maximum.
Claim 15
Dependent Claim
62 words
A high-dielectric constant ceramic composite comprising: a first constituent component having barium titanate as a major component; a second constituent component having a perovskite compound including lead as a major component; and a glass component having at least one of silicon and boron and being present in a maximum amount of 5 wt % with respect to said first and second constituents.
Claim 16
Dependent Claim
62 words
A high-dielectric constant ceramic composite comprising: a first constituent component having barium titanate as a major component; a second constituent component having a perovskite compound including lead as a major component; and a glass component having at least one of silicon and boron and being present in a maximum amount of 5 wt % with respect to said first and second constituents.
Claim 17
Dependent Claim
12 words
The composite of claim 13, wherein said glass component includes silicate glass.
Claim 18
Dependent Claim
12 words
The composite of claim 13, wherein said glass component includes borosilicate glass.
Claim 19
Dependent Claim
23 words
The composite of claim 13, wherein said second constituent component includes a perovskite compound of the Pb(Zn 1/3 Nb 2/3 )O 3 group.
Claim 20
Dependent Claim
70 words
A capacitor element having a high-dielectric constant ceramic composite as a dielectric, said composite comprising: a first constituent component having barium titanate as a major component; a second constituent component having a lead-based perovskite compound as a major component; and a glass component having at least one of silicon and boron and being present in a maximum amount of 5 wt % with respect to said first and second constituents.
Claim 21
Dependent Claim
70 words
A capacitor element having a high-dielectric constant ceramic composite as a dielectric, said composite comprising: a first constituent component having barium titanate as a major component; a second constituent component having a lead-based perovskite compound as a major component; and a glass component having at least one of silicon and boron and being present in a maximum amount of 5 wt % with respect to said first and second constituents.
Claim 22
Dependent Claim
13 words
The capacitor element of claim 17 wherein said glass component includes silicate glass.
Claim 23
Dependent Claim
13 words
The capacitor element of claim 17, wherein said glass component includes borosilicate glass.
Claim 24
Dependent Claim
24 words
The capacitor element of claim 19, wherein said second constitutive component includes a perovskite compound of the Pb(Zn 1/3 Nb 2/3 )O 3 group.
Claim 25
Dependent Claim
44 words
A capacitor element having a high-dielectric constant ceramic composite comprising: a leas-based perovskite compound as a major component; and a plurality of amorphous phases having at least PbO, B 2 O 3 and SiO 2 , said amorphous phases being formed at triple points.
Claim 26
Dependent Claim
44 words
A capacitor element having a high-dielectric constant ceramic composite comprising: a leas-based perovskite compound as a major component; and a plurality of amorphous phases having at least PbO, B 2 O 3 and SiO 2 , said amorphous phases being formed at triple points.
Claim 27
Dependent Claim
94 words
The capacitor element of claim 21, wherein said perovskite compound includes a glass including the following constitutes B 2 O 3 of about 10 wt % to about 80 wt %, SiO 2 of about 10 wt % to about 60 wt %, Al 2 O 3 of about 2 wt % to about 20 wt %, BaO of about 2 wt % to about 20 wt %, and MgO of about 2 wt % to about 20 wt %; and said amorphous phases includes PbO of about 50 wt % at a maximum.
Claim 28
Dependent Claim
50 words
The capacitor element of claim 21, wherein said perovskite compound includes at least one of Pb(Mg 1/3 Nb 2/3 )O 3 and Pb(Zn 1/3 Nb 2/3 )O 3 by 50 mol % at a minimum, and said Pb is partially substituted by at least one of Ba, Sr and Ca.
Claim 29
Dependent Claim
148 words
The capacitor element of claim 21, wherein said perovskite compound of the Pb group has a portion of the Pb being substituted by at least one of Ba and Sr by about 1 mol % to about 35 mol %, the portion of the Pb being defined in such a manner that when said perovskite compound is represented by the general expression of xPb(Zn.sub.1/3 Nb.sub.2/3)O.sub.3 --yPb(Mg.sub.1/3 Nb.sub.2/3)O.sub.3 --zPbTiO.sub.3, three components of which are shown as apexes x, y and z in a prescribed three-element chart, the portion of the Pb is limited to the area surrounded by lines a--b, b--c, c--d and d--a including those points on the lines except on the line a--b, where the respective points a, b, c and d are determined as follows, a (x=0.50, y=0.00, and z=0.50), b (x=1.00, y=0.00, and z=0.00), c (x=0.20, y=0.80, and z=0.00), and d (x=0.05, y=0.90, and z=0.05).
Claim 30
Dependent Claim
18 words
The composite of claim 15, wherein said glass component is present in an amount of 0.005-1.0 wt %.
Claim 31
Dependent Claim
19 words
The capacitor element of claim 19, wherein said glass component is present in an amount of 0.005-1.0 wt %.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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