Patent US649546A successfully refreshed from Google Patents.
US4643984A
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Process for producing a composition which includes perovskite compounds
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1985-07-23
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Granted: 1987-02-17
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Expires: 2005-07-23
Abstract
Abstract A process for producing a composition which includes a perovskite compound, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or (c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent to insolubilize the water-soluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (d) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio.
Inventors
- 👤 Kazunobu Abe
- 👤 Masashi Aoki
- 👤 Hiroaki Rikimaru
- 👤 Takeshi Ito
- 👤 Kazuhisa Hidaka
- 👤 Kayoko Segawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:07
CPC Classifications
C; C01; C01G; C01G23/00; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; C04B35/491; B; B82; B82Y; B82Y30/00; C01G19/00; C01G21/00; C01G23/003; C01G23/006; C01G25/00; C01G25/006; C01G27/00; C01G27/006; C04B35/46; C04B35/462; C04B35/465; C04B35/468; C04B35/4682; C04B35/493; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/01; C01P2004/04; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
A process for producing a composition which includes a perovskite compound, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or (c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent to insolubilize the water-soluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (d) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio.
Claim 2
Dependent Claim
232 words
A process for producing a composition which includes a perovskite compound, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or (c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent to insolubilize the water-soluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (d) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio.
Claim 3
Dependent Claim
162 words
A process for producing a composition which includes a perovskite compound, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-insoluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (c) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio.
Claim 4
Dependent Claim
162 words
A process for producing a composition which includes a perovskite compound, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-insoluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (c) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio.
Claim 5
Dependent Claim
255 words
A process for producing a sintered body which is substantially composed of a perovskite compound of desired atomic ratios, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element from the group consisting of Ti; Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or (c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent to insolubilize the water-souble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (d) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio; and then (e) sintering the composition at temperatures from about 1100° C. to about 1300° C.
Claim 6
Dependent Claim
255 words
A process for producing a sintered body which is substantially composed of a perovskite compound of desired atomic ratios, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element from the group consisting of Ti; Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) adding an insolubilizing agent to the resultant reaction mixture to insolubilize water-soluble compounds of the unreacted A group element dissolved in the aqueous medium so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; or (c) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-soluble compound of the A group element, and then adding to the slurry an insolubilizing agent to insolubilize the water-souble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; and (d) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio; and then (e) sintering the composition at temperatures from about 1100° C. to about 1300° C.
Claim 7
Dependent Claim
184 words
A process for producing a sintered body which is substantially composed of a perovskite compound of desired atomic ratios, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-inoluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; (c) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio; and (d) sintering the composition at temperatures from about 1100° C. to about 1300° C.
Claim 8
Dependent Claim
184 words
A process for producing a sintered body which is substantially composed of a perovskite compound of desired atomic ratios, the process comprising: (a) subjecting a mixture of a hydroxide of at least one A group element selected from the group consisting of Mg, Ca, Sr, Ba, Pb and rare earth elements and a hydroxide of at least one B group element selected from the group consisting of Ti, Zr, Hf and Sn, to the hydrothermal reaction in an aqueous reaction medium; (b) filtering, washing with water and drying the resultant reaction mixture to provide a solid reaction product, dispersing the reaction product in an aqueous medium to form a slurry, adding to the slurry a water-inoluble compound of the A group element so as to adjust the ratio of the group A element to the group B element in a resulting composition to a desired A/B ratio; (c) filtering, washing and drying the resultant mixture to provide the composition which includes the perovskite compound having the desired A/B ratio; and (d) sintering the composition at temperatures from about 1100° C. to about 1300° C.
Claim 9
Dependent Claim
46 words
The process as claimed in claim 3 wherein the composition is mixed with at least one oxide of an element selected from the group consisting of Bi, B, Pb and W, and the mixture was sintered at temperatures from about 900° C. to about 1100° C.
Claim 10
Dependent Claim
46 words
The process as claimed in claim 4 wherein the composition is mixed with at least one oxide of a element selected from the group consisting of Bi, B, Pb and W, and the mixture was sintered at temperatures from about 900° C. to about 1100° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |