US4547355A
Expired / Lapsed
US
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Method for manufacturing fine powder of SrZrO3
Assignee: Sony Corp
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Filing: 1984-06-26
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Granted: 1985-10-15
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Expires: 2004-06-26
Abstract
Abstract A method for manufacturing fine powder of SrZrO 3 is described in which a hydrolyzate of a Zr compound and an Sr compound are reacted with each other in a strongly alkaline aqueous solution to obtain fine powder of SrZrO 3 .
Inventors
- 👤 Satoru Uedaira
- 👤 Hiroshi Yamanoi
- 👤 Masayuki Suzuki
- 👤 Hidemasa Tamura
- 👤 Hiroyuki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
C; C01; C01G; C01G25/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A method of manufacturing fine powder of strontium zirconate which comprises the steps of: reacting an oxide type hydrolyzate of a water soluble zirconium compound with a strontium compound in a strongly alkaline aqueous solution of a pH not less than 14.45 for a time sufficient to complete the reaction at a temperature not lower than 88° C., thereby forming SrZrO 3 as a precipitate; separating the precipitate from the solution; and drying the precipitate to obtain a fine powder of SrZrO 3 .
Claim 2
Independent Claim
84 words
A method of manufacturing fine powder of strontium zirconate which comprises the steps of: reacting an oxide type hydrolyzate of a water soluble zirconium compound with a strontium compound in a strongly alkaline aqueous solution of a pH not less than 14.45 for a time sufficient to complete the reaction at a temperature not lower than 88° C., thereby forming SrZrO 3 as a precipitate; separating the precipitate from the solution; and drying the precipitate to obtain a fine powder of SrZrO 3 .
Claim 3
Dependent Claim
14 words
The method according to claim 1, wherein the pH is not lower than 14.6.
Claim 4
Dependent Claim
27 words
The method according to claim 1, wherein the reaction between the hydrolyzate and the strontium compound is effected in an Sr-to-Zr molar ratio not smaller than 0.35:1.
Claim 5
Dependent Claim
15 words
The method according to claim 3, wherein the molar ratio is not smaller than 0.7:1.
Claim 6
Dependent Claim
48 words
The method according to claim 1, wherein said zirconium compound is a member selected from the group consisting of ZrCl 4 , ZrOCl 2 .8H 2 O, Zr(NO 3 ) 4 ,, ZrO(NO 3 ) 2 .2H 2 O, Zr(SO 4 ) 2 , and ZrOSO 4 .
Claim 7
Dependent Claim
42 words
The method according to claim 1, wherein said strontium compound is a member selected from the group consisting of SrO, Sr(OH) 2 , Sr(OH) 2 .8H 2 O, SrCl 2 , Sr(NO 3 ) 2 , and Sr(CH 3 COO) 2 .
References Cited (Backward Citations)
SU165686A1
Cited
GB1122380A
Cited
SU392005A1
Cited
SU644735A1
Cited
US4293534A
Cited
US4374117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |