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US5925183A
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Method for producing layer-structured perovskite thin film of bismuth-based compounds having ferroelectric properties
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1998-02-11
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Granted: 1999-07-20
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Expires: 2018-02-11
Abstract
Abstract The present invention relates to a method for producing an Sr--Bi--Ta or Nb-based composite alkoxide with the structure of an atomic arrangement controlled, having a metal atomic ratio of Sr:Bi:Ta or Nb=1:2:2, characterized in that an Sr alkoxide (Sr(OR) 2 ) prepared from an Sr metal is allowed to react with a Bi alkoxide (Bi(OR) 3 ) in alcohol to produce an Sr--Bi double alkoxide (Sr Bi(OR) 4 ! 2 ), and subsequently the alkoxide is allowed to react with a Ta alkoxide (Ta(OR) 5 ) or an Nb alkoxide (Nb(OR) 5 ).
Inventors
- 👤 Kazumi Kato
- 👤 Sandwip Kumar Dey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:47
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; C07; C07F; C07F9/00; C07F9/94
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
A method for producing an Sr--Bi--Ta or Nb-based composite alkoxide with the structure of an atomic arrangement controlled, having a metal atomic ratio of Sr:Bi:Ta or Nb=1:2:2, characterized in the processes which comprises of reacting an Sr alkoxide (Sr(OR) 2 ) prepared from an Sr metal with a Bi alkoxide (Bi(OR) 3 ) in alcohol to produce an Sr--Bi double alkoxide (Sr Bi(OR) 4 ! 2 ), and subsequently reacting the obtained alkoxide with a Ta alkoxide (Ta(OR) 5 ) or an Nb alkoxide (Nb(OR) 5 ).
Claim 2
Independent Claim
87 words
A method for producing an Sr--Bi--Ta or Nb-based composite alkoxide with the structure of an atomic arrangement controlled, having a metal atomic ratio of Sr:Bi:Ta or Nb=1:2:2, characterized in the processes which comprises of reacting an Sr alkoxide (Sr(OR) 2 ) prepared from an Sr metal with a Bi alkoxide (Bi(OR) 3 ) in alcohol to produce an Sr--Bi double alkoxide (Sr Bi(OR) 4 ! 2 ), and subsequently reacting the obtained alkoxide with a Ta alkoxide (Ta(OR) 5 ) or an Nb alkoxide (Nb(OR) 5 ).
Claim 3
Dependent Claim
63 words
A method for producing a precursor composite alkoxide solution for an Sr--Bi--Ta or Nb-based thin film with the structure of an atomic arrangement controlled to be similar to that of the sub-lattice of the crystal structure of a desired thin film, wherein the composite alkoxide as claimed in claim 1 is hydrolyzed by water with a molar ratio of from 1/18 to 1/6.
Claim 4
Dependent Claim
34 words
An Sr--Bi--Ta or Nb-based composite alkoxide with the structure of an atomic arrangement controlled, having a metal atomic ratio of Sr:Bi:Ta or Nb=1:2:2, which is produced by the process as claimed in claim 1.
References Cited (Backward Citations)
US5516363A
Cited
US5788757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-19 | 2003-01-18 | 2003-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-19 | 2007-01-18 | 2007-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-19 | 2011-01-18 | 2011-07-20 | $7700.00 | Window Closed / Lapsed |