US5034359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulating composition
Assignee: Toshiba Corp
•
Filing: 1989-04-07
•
Granted: 1991-07-23
•
Expires: 2009-04-07
Abstract
Abstract An insulating composition consisting of Bi, Sr, RE, Cu, O or of Tl, Ba, RE, Cu, O (wherein; RE is an element selected from a group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) aligns properly with a crystal face of an oxide superconductor because its crystal structure is the same as or similar to that of the oxide superconductor. An insulating composition in which a part of Bi is replaced by Pb is further near the oxide superconductor its construction, and the modulation structure in this insulating composition is mitigated or disappears.
Inventors
- 👤 Noburu Fukushima
- 👤 Shunji Nomura
- 👤 Hisashi Yoshino
- 👤 Ken Ando
- 👤 Hiromi Niu
- 👤 Tomohisa Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:34
CPC Classifications
B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C04B35/4512; C04B35/4521; C04B35/622; C04B35/653; H; H10; H10N; H10N60/00; H10N60/10; H10N60/12; H10N60/124; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/345; C04B2237/346; C04B2237/50; C04B2237/70; C04B2237/704; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/775; Y10S505/776; Y10S505/782
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
51 words
An insulating composition consisting essentially of Bi, Sr, Ca, Cu and O or of Tl, Ba, Ca, Cu and O wherein Ca, is replaced by RE wherein RE is an element selected from a group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y.
Claim 2
Dependent Claim
51 words
An insulating composition consisting essentially of Bi, Sr, Ca, Cu and O or of Tl, Ba, Ca, Cu and O wherein Ca, is replaced by RE wherein RE is an element selected from a group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y.
Claim 3
Dependent Claim
32 words
The insulating composition of claim 1, characterized in that the atomic ratio of Bi, Sr, RE, Cu and O or of Tl, Ba, RE, Cu and O is 2:X:Y:Z 8+ δ ##EQU4##
Claim 4
Independent Claim
129 words
A method of forming an insulating composition including Bi, Sr, RE, Cu and O by the atomic ratio of 2:X:Y:Z:8+δ ##EQU5## δ: oxygen defect, wherein RE is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y, said method comprising the steps of preparing a mixture of raw powders including Bi 2 O 3 , SrCO 3 , RE 2 O 3 , CuO with the atomic ratio of Bi:Si:RE:Cu is 3:2:1:3, placing said mixture in a crucible, maintaining said mixture for about 24 hours at a temperature of about 1150 degrees C. at atmospheric pressure to achieve melting, lowering the temperature gradually to about 800 degrees C. within about 100 hours and cooling to room temperature.
Claim 5
Independent Claim
129 words
A method of forming an insulating composition including Bi, Sr, RE, Cu and O by the atomic ratio of 2:X:Y:Z:8+δ ##EQU5## δ: oxygen defect, wherein RE is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y, said method comprising the steps of preparing a mixture of raw powders including Bi 2 O 3 , SrCO 3 , RE 2 O 3 , CuO with the atomic ratio of Bi:Si:RE:Cu is 3:2:1:3, placing said mixture in a crucible, maintaining said mixture for about 24 hours at a temperature of about 1150 degrees C. at atmospheric pressure to achieve melting, lowering the temperature gradually to about 800 degrees C. within about 100 hours and cooling to room temperature.
Claim 6
Independent Claim
116 words
A method of forming an insulating composition including Bi, Sr, RE, Cu, O by the atomic ratio of 2:X:Y:Z:8+δ ##EQU6## δ: oxygen defect wherein, RE is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y, said method comprising the steps of preparing a mixture for melting, said mixture consisting essentially of Bi 2 O 3 , SrO, RE0, and CuO in a mol ratio in accordance with the formula; ##EQU7## melting the mixture in a crucible, and lowering the temperature of the mixture to produce a monocrystalline structure having a composition of Bi 2 Sr x RE y Cu z O 8+ δ.
Claim 7
Independent Claim
116 words
A method of forming an insulating composition including Bi, Sr, RE, Cu, O by the atomic ratio of 2:X:Y:Z:8+δ ##EQU6## δ: oxygen defect wherein, RE is an element selected from the group consisting of Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Ym, Yb, Lu and Y, said method comprising the steps of preparing a mixture for melting, said mixture consisting essentially of Bi 2 O 3 , SrO, RE0, and CuO in a mol ratio in accordance with the formula; ##EQU7## melting the mixture in a crucible, and lowering the temperature of the mixture to produce a monocrystalline structure having a composition of Bi 2 Sr x RE y Cu z O 8+ δ.
Claim 8
Dependent Claim
17 words
An insulating composition of claim 1 characterized in that a part of Bi is replaced by Pb.
Claim 9
Dependent Claim
27 words
An insulating composition of claim 5 characterized in that the atomic ratio of Bi, Pb, Sr, RE, Cu, O is 2-W:W:2:1:2:8+δ, wherein: O<W≦1.5 δ is oxygen defect.
Claim 10
Dependent Claim
14 words
An insulating composition of claim 6 characterized in that W is represented by: 0.2≦W≦1.0.
Claim 11
Dependent Claim
27 words
An insulating composition of claim 5 characterized in that the atomic ratio of Bi, Pb, Sr, RE, Cu, O is 2-W:W:2:2:3:10+δ, wherein: O<W≦1.5 δ is oxygen defect.
Claim 12
Dependent Claim
14 words
An insulating composition of claim 8 characterized in that W is represented by: 0.2≦W≦1.0.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |