EP0344978A2
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Ferroelectric ceramic material
Assignee: Mitsui Chemicals Inc
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Filing: 1989-05-25
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Granted: —
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Expires: 2009-05-25
Abstract
Abstract Proposed are ferroelectric ceramic materials which are Perovskite solid solutions comprising a solid solution of formula Pb 1 - a M a (Mg 1/3 Nb 2/3 ) x Ti y Zr z O₃ wherein M is Ba or Sr, x + y + z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, which solid solution contains either (i) at least one oxide selected from La₂O₃, Bi₂O₃ and Nd₂O₃ as group A oxide and at least one oxide selected from NiO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO or Fe₂O₃ is necessarily contained, or (ii) MnO₂, at least one said group A oxide and at least one oxide selected from NiO, ZnO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO, Fe₂O₃ or Ta₂O₅ is necessarily contained. These ferroelectric ceramic materials have a large piezoelectric strain constant d.
Inventors
- 👤 Yoshihisa Mitsui Petrochemical Ind. Ltd. Ushida
- 👤 Nobuki Mitsui Petrochemical Ind. Ltd. Hirai
- 👤 Hiroshi Mitsui Petrochemical Ind. Ltd. Mase
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 23:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; C04B35/493; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/853; H10N30/8548
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A ferroelectric ceramic material which is a Perovskite solid solution which comprises a solid solution of formula Pb 1 - a M a (Mg 1/3 Nb 2/3 ) x Ti y Zr z O₃ wherein M is Ba or Sr, x + y + z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, which solid solution contains at least one oxide selected from La₂O₃, Bi₂O₃ and Nd₂O₃ as group A oxide and at least one oxide selected from NiO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO or Fe₂O₃ is necessarily contained.
Claim 2
Dependent Claim
116 words
A ferroelectric ceramic material which is a Perovskite solid solution which comprises a solid solution of formula Pb 1 - a M a (Mg 1/3 Nb 2/3 ) x Ti y Zr z O₃ wherein M is Ba or Sr, x + y + z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, which solid solution contains at least one oxide selected from La₂O₃, Bi₂O₃ and Nd₂O₃ as group A oxide and at least one oxide selected from NiO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO or Fe₂O₃ is necessarily contained.
Claim 3
Dependent Claim
26 words
A ceramic material according to claim 1 wherein metal of said group B oxide is present in the form of Ni²⁺, Fe³⁺, Sn⁴⁺ or Ta⁵⁺ ions.
Claim 4
Dependent Claim
120 words
A ferroelectric ceramic material which is a Perovskite solid solution which comprises a solid solution of formula Pb 1 - a M a (Mg 1/3 Nb 2/3 ) x Ti y Zr z O₃ wherein M is Ba or Sr, x + y + z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, which solid solution contains MnO₂, at least one oxide selected from La₂O₃, Bi₂O₃ and Nd₂ O₃ as group A oxide and at least one oxide selected from NiO, ZnO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO, Fe₂O₃ or Ta₂O₅ is necessarily contained.
Claim 5
Dependent Claim
120 words
A ferroelectric ceramic material which is a Perovskite solid solution which comprises a solid solution of formula Pb 1 - a M a (Mg 1/3 Nb 2/3 ) x Ti y Zr z O₃ wherein M is Ba or Sr, x + y + z is 1, a is from 0 to 0.10, x is from 0.05 to 0.70, y is from 0.25 to 0.50 and z is from 0.05 to 0.70, which solid solution contains MnO₂, at least one oxide selected from La₂O₃, Bi₂O₃ and Nd₂ O₃ as group A oxide and at least one oxide selected from NiO, ZnO, Fe₂O₃, SnO₂ and Ta₂O₅ as group B oxide, with the proviso that NiO, Fe₂O₃ or Ta₂O₅ is necessarily contained.
Claim 6
Dependent Claim
27 words
A ceramic material according to claim 3 wherein metal of said group B oxide is present in the form of Ni²⁺, Zn²⁺, Fe³⁺, Sn⁴⁺ or Ta⁵⁺ ions.
Claim 7
Dependent Claim
26 words
A ceramic material according to claim 3 or 4 wherein the amount of MnO₂ present in the solid solution is from 0.1 to 2.0% by weight.
Claim 8
Dependent Claim
29 words
A ceramic material according to any one of the preceding claims wherein metal of said group A oxide is present in the form of La³⁺, Bi³⁺ or Nd³⁺ ions.
Claim 9
Dependent Claim
45 words
A ceramic material according to claim 6 wherein the metal ions of the group A oxide are present in an amount of from 0.5 to 5.0 atom equivalents per 100 atom equivalents of the sum of Pb and M present in the Perovskite solid solution.
Claim 10
Dependent Claim
81 words
A ceramic material according to any one of the preceding claims wherein the metal ions of the group B oxide are present in such amount that the relation: 0.5≦N≦5.0 is met, in which N is defined by the equation: wherein n Ai and n Bj are the valencies of metal ions of group A and group B oxides, respectively, and x Ai and x Bj are the atom equivalents of metal ions of the group A and group B oxides, respectively.
Claim 11
Dependent Claim
18 words
Use of a ferroelectric ceramic material as claimed in any one of the preceding claims as an actuator.
References Cited (Backward Citations)
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