EP0294991A2
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EP
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Readily sinterable powder of perovskite type oxide containing group Va element and laminated element obtained therefrom
Assignee: Nippon Steel Corp
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Filing: 1988-06-01
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Granted: —
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Expires: 2008-06-01
Abstract
Abstract A method of synthesizing piezoelectric-electrostrictive and dielectric ceramics powder, which comprises mixing an aqueous oxalate solution of a group Va element of the periodic table, a solution containing at least one ion selected from the group consisting of ions of Pb, Bi, Ba, Sr, Ca, and rare earth elements (hereinafter "A" element) and a solution containing at least one ion selected from the group consisting of ions of Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ti, Zr, and Hf (hereinafter "B" element) with an alcohol to form precipitates of oxalates of "A" and "B" elements, adjusting a pH of the solution to 3 or more to form hydroxides of the group Va element of the periodic table in the oxalate precipitates, and mixing, filtering, washing, drying, and pyrolyzing the mixture comprising the oxalates of "A" and "B" elements and hydroxides of the group Va element of the periodic table, whereby a perovskite type oxide containing the group Va element is synthesized and multilayer elments, multilayer electrostrictive actuators and multilayer ceramic capacitors derived from the above-mentioned readily sinterable Pb(Mg 1/3 Nb 2/3 )O₃-based oxide powder are also provided.
Inventors
- 👤 Ryuji C/O R&D Laboratories-1 Suyama
- 👤 Kei C/O R&D Laboratories-1 Tanemoto
- 👤 Hiroshi C/O R&D Laboratories-1 Kubo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 06:52
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/185; C01G; C01G35/00; C01G35/006; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/4684; C04B35/495; C04B35/497; C04B35/499; C04B35/622; C04B35/626; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/093; H10N30/097; H10N30/80; H10N30/85; H10N30/853; H10N30/8548; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/40; H10N30/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A method of synthesizing piezoelectric and dielectric ceramics powder, which comprises mixing an aqueous oxalate solution of a group Va element of the periodic table, a solution containing at least one ion selected from the group consisting of ions of Pb, Bi, Ba, Sr, Ca, and rare earth elements (hereinafter "A" element) and a solution containing at least one ion selected from the group consisting of ions of Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ti, Zr, and Hf (hereinafter "B" element) with an alcohol to form precipitates of oxalates of "A" and "B" elements, adjusting a pH of said solution to 3 or more to form hydroxides of the group Va element of the periodic table in said oxalate precipitates, and mixing, filtering, washing, drying, and pyrolyzing the mixture comprising said oxalates of "A" and "B" elements and hydroxides of the group Va element of the periodic table, whereby a perovskite type oxide powder containing the group Va element is synthesized.
Claim 2
Independent Claim
163 words
A method of synthesizing piezoelectric and dielectric ceramics powder, which comprises mixing an aqueous oxalate solution of a group Va element of the periodic table, a solution containing at least one ion selected from the group consisting of ions of Pb, Bi, Ba, Sr, Ca, and rare earth elements (hereinafter "A" element) and a solution containing at least one ion selected from the group consisting of ions of Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ti, Zr, and Hf (hereinafter "B" element) with an alcohol to form precipitates of oxalates of "A" and "B" elements, adjusting a pH of said solution to 3 or more to form hydroxides of the group Va element of the periodic table in said oxalate precipitates, and mixing, filtering, washing, drying, and pyrolyzing the mixture comprising said oxalates of "A" and "B" elements and hydroxides of the group Va element of the periodic table, whereby a perovskite type oxide powder containing the group Va element is synthesized.
Claim 3
Independent Claim
168 words
A method of synthesizing a piezoelectric and dielectric ceramics powder, which comprises mixing a solution containing at least one ion selected from the group consisting of ions of elements of Pb, Bi, Ba, Sr, Ca or rare earth elements (hereinafter "A" element) and at least one ion selected from the group consisting of elements of Mg, Cr, Zn, Mn, Fe, Co, Ni, Cu, Hf, Ti or Zr (hereinafter "B" element) with an alcoholic solution of oxalic acid to form precipitates of oxalates of the "A" and "B" elements, adjusting the pH of said solution to 3 or higher, mixing a solution containing ions of a group Va element of the periodic table with said solution, while precipitating hydroxides of a group Va element of the periodic table, and mixing, filtering, washing, drying and pyrolyzing the mixture comprising said oxalates of "A" and "B" elements and hydroxides of the group Va element of the periodic table, whereby a perovskite type oxide powder containing the group Va element is synthesized.
Claim 4
Independent Claim
168 words
A method of synthesizing a piezoelectric and dielectric ceramics powder, which comprises mixing a solution containing at least one ion selected from the group consisting of ions of elements of Pb, Bi, Ba, Sr, Ca or rare earth elements (hereinafter "A" element) and at least one ion selected from the group consisting of elements of Mg, Cr, Zn, Mn, Fe, Co, Ni, Cu, Hf, Ti or Zr (hereinafter "B" element) with an alcoholic solution of oxalic acid to form precipitates of oxalates of the "A" and "B" elements, adjusting the pH of said solution to 3 or higher, mixing a solution containing ions of a group Va element of the periodic table with said solution, while precipitating hydroxides of a group Va element of the periodic table, and mixing, filtering, washing, drying and pyrolyzing the mixture comprising said oxalates of "A" and "B" elements and hydroxides of the group Va element of the periodic table, whereby a perovskite type oxide powder containing the group Va element is synthesized.
Claim 5
Dependent Claim
50 words
A readily sinterable powder of Pb(Mg 1/3 Nb 2/3 )O₃ comprising a single phase perovskite having particles which are substantially spherical in shape and having an average particle size, and a standard deviation of both being 1 µm or less, which is sinterable at a temperature of 1000°C or lower.
Claim 6
Dependent Claim
50 words
A readily sinterable powder of Pb(Mg 1/3 Nb 2/3 )O₃ comprising a single phase perovskite having particles which are substantially spherical in shape and having an average particle size, and a standard deviation of both being 1 µm or less, which is sinterable at a temperature of 1000°C or lower.
Claim 7
Dependent Claim
55 words
A readily sinterable powder for a multilayer element of Pb(Mg 1/3 Nb 2/3 )O₃-based oxides in which one or two of PbTiO₃ and Ba(Zn 1/3 Nb 2/3 )O₃ are added to the Pb(Mg 1/3 Nb 2/3 )O₃ of claim 3 in an amount of 5 to 50 mol% of the total amount of the powder.
Claim 8
Dependent Claim
174 words
A method of producing the readily sinterable powder for a multilayer element of claim 3, wherein the powder is produced by a method of synthesizing a powder of the perovskite type oxide containing Pb(Mg 1/3 Nb 2/3 )O₃ or Pb(Mg 1/3 Nb 2/3 )O₃ , as the main component, and optionally one or both of PbTiO₃ and Ba(Zn 1/3 Nb 2/3 )O₃ by mixing an aqueous oxalate solution of Nb, a solution containing a Pb ion or a Pb ion and a Ba ion (hereinafter "A" element), a solution containing an Mg ion or an Mg ion and one or both of a Ti ion and a Zn ion (hereinafter "B" element), with an alcohol to form precipitates of oxalates of "A" elements and "B" elements, adjusting the pH of said solution to 3 or more to form hydroxides of Nb in the precipitates of oxalates of said "A" element and "B" element, and mixing, filtering, washing, drying, and pyrolyzing the mixture comprising oxalates of said "A" and "B" elements and hydroxides of Nb.
Claim 9
Dependent Claim
174 words
A method of producing the readily sinterable powder for a multilayer element of claim 4, wherein the powder is produced by a method of synthesizing a powder of the perovskite type oxide containing Pb(Mg 1/3 Nb 2/3 )O₃ or Pb(Mg 1/3 Nb 2/3 )O₃ , as the main component, and optionally one or both of PbTiO₃ and Ba(Zn 1/3 Nb 2/3 )O₃ by mixing an aqueous oxalate solution of Nb, a solution containing a Pb ion or a Pb ion and a Ba ion (hereinafter "A" element), a solution containing an Mg ion or an Mg ion and one or both of a Ti ion and a Zn ion (hereinafter "B" element), with an alcohol to form precipitates of oxalates of "A" elements and "B" elements, adjusting the pH of said solution to 3 or more to form hydroxides of Nb in the precipitates of oxalates of said "A" element and "B" element, and mixing, filtering, washing, drying, and pyrolyzing the mixture comprising oxalates of said "A" and "B" elements and hydroxides of Nb.
Claim 10
Dependent Claim
69 words
A multilayer electrostrictive actuator produced by laminating a plurality of ceramic green sheets having an internal electrode material printed thereon, said ceramic green sheets comprising the readily sinterable powder of Pb(Mg 1/3 Nb 2/3 )O₃ of claim 3, or Pb(Mg 1/3 Nb 2/3 )O₃ containing 5 to 50 mol% of one or two of PbTiO₃ and Ba(Zn 1/3 Nb 2/3 )O₃ added thereto, of claim 4, followed by sintering.
Claim 11
Dependent Claim
69 words
A multilayer ceramic capacitor produced by laminating a plurality of ceramic green sheets having an internal electrode material printed thereon, said ceramic green sheets comprising the readily sinterable powder of Pb(Mg 1/3 Nb 2/3 )O₃ of claim 3, or Pb(Mg 1/3 Nb 2/3 )O₃ containing 5 to 50 mol% of one or two of PbTiO₃ and Ba(Zn 1/3 Nb 2/3 )O₃ added thereto, of claim 4, followed by sintering.
References Cited (Backward Citations)
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