WO2004100182A1 - 希土類系酸化物超電導体及びその製造方法 - Google Patents
希土類系酸化物超電導体及びその製造方法 Download PDFInfo
- Publication number
- WO2004100182A1 WO2004100182A1 PCT/JP2004/006406 JP2004006406W WO2004100182A1 WO 2004100182 A1 WO2004100182 A1 WO 2004100182A1 JP 2004006406 W JP2004006406 W JP 2004006406W WO 2004100182 A1 WO2004100182 A1 WO 2004100182A1
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- WIPO (PCT)
- Prior art keywords
- intermediate layer
- rare earth
- oxide superconductor
- layer
- earth oxide
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/01—Manufacture or treatment
- H10N60/0268—Manufacture or treatment of devices comprising copper oxide
- H10N60/0296—Processes for depositing or forming copper oxide superconductor layers
- H10N60/0576—Processes for depositing or forming copper oxide superconductor layers characterised by the substrate
- H10N60/0632—Intermediate layers, e.g. for growth control
Definitions
- the present invention relates to an oxide superconductor and a method for producing the same, and more particularly to a tape-shaped rare earth oxide superconductor (HE-based superconductor) suitable for use in equipment such as a superconducting magnet and a superconducting cable, and a method for producing the same. Regarding improvement. Background art
- Rare-earth 123-based oxide superconductors are practical because their magnetic field characteristics at liquid nitrogen temperature are superior to Bi-based superconductors (Bi-Sr_Ca-Cu-0-based superconductors) It is possible to achieve a high critical current density (Jc) in a high magnetic field, and if this wire is successfully put into practical use, in addition to its excellent properties in the high-temperature region, a manufacturing method that does not use the noble metal silver Since the cooling efficiency can be improved by several tens to several hundreds of times because the liquid nitrogen can be used as the refrigerant and the cooling efficiency can be improved, it is extremely economically advantageous. As a result, it is possible to use superconducting wires even for equipment that was previously inapplicable in terms of economics, and it is expected that the use and market of superconducting equipment will expand significantly.
- the above-mentioned manufacturing method of increasing the crystal orientation of the Y-123-based superconductor and forming a wire while aligning the in-plane orientation is the same as the method of manufacturing a thin film. That is, an intermediate layer having an improved degree of in-plane orientation and orientation is formed on a tape-shaped metal substrate, and the crystal lattice of the intermediate layer is used as a template, whereby the in-plane crystal of the Y-123 superconductor is formed.
- the degree of orientation and orientation can be improved.
- the Jc of the superconductor depends on the crystallinity and surface smoothness of the intermediate layer, and that its characteristics change significantly depending on the state of the underlayer.
- SOE Surface-Oxidation Epitaxy
- ISD Indined Substrate Deposition
- IB AD Ion Beam Assisted Deposotion
- EABiTS Rolling Assisted Biaxially Textured Substrate
- the formation of the intermediate layer is in the IBAD or RABiTS method, PLD; we use vacuum process by the vapor phase method such as (Pulse Laser Deposition pulsed laser deposition) method, a combination of Hasuteroi ZYSZZY 2 0 3 in the IBAD method
- a combination of NiZCeO 2 ZYSZ / CeO 2 is generally used as a biaxially oriented metal substrate, which has an advantage that a dense and smooth intermediate layer film can be obtained (for example, See Patent Document 1.).
- the CeO 2 intermediate layer has good crystal lattice consistency with the YBCO layer (Y—Ba—Cu-0 based superconducting layer), and Known as one of the best intermediate layers due to its low reactivity with the layer, numerous results have been reported.
- CeO 2 cracks caused by the force CeO 2 film having excellent properties differences like in thermal expansion between the metal substrate is easy thick as the intermediate layer
- YSZ yttrium-stabilized zirconia
- a CeO 2 film (11), a YSZ layer (12) and a CeO 2 film (13) were sequentially formed, and a YBCO layer (14) had to be formed thereon.
- the present invention has been made in order to solve the above-mentioned difficulties, and is intended to prevent the occurrence of cracks and to form an intermediate layer having excellent crystallinity such as orientation and orientation and surface smoothness.
- An object of the present invention is to provide a RE-based superconductor in which a rare-earth oxide superconducting layer (RE-based superconducting layer) having excellent superconducting properties is formed on the intermediate layer by forming the superconducting layer on a metal substrate.
- Another object of the present invention is to form an intermediate layer having excellent crystallinity such as degree of in-plane orientation and orientation and surface smoothness on a metal substrate within a predetermined pressure and temperature range, while preventing the occurrence of cracks.
- An object of the present invention is to provide a method of manufacturing a RE superconductor in which a RE superconductor layer having excellent superconducting properties is formed on the intermediate layer by forming by firing.
- FIG. 1 is a cross-sectional view showing an example of the RE-based superconductor according to the first embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a conventional rare-earth oxide superconductor obtained by the RABiTS method. BEST MODE FOR CARRYING OUT THE INVENTION
- the RE-based superconductor according to the first embodiment of the present invention has a rare earth element Re (Re: Any one of Y, Nd, Sm, Gd, Eu, Yb, Ho, Tm, Dy, La, and Er is shown.)
- An intermediate layer (2) made of a cerium-based oxide added with 5 to 90 mol% is formed, and an RE-based superconducting layer (3) is formed on this intermediate layer.
- a method for manufacturing an EE-based superconductor comprises the steps of: forming a rare earth element Re (Re: Y, Nd, Sm , Gd, Eu, Yb, Ho, Tm, Dy, La, or Er.) 5 to 90 mol% in terms of metal content.
- the mixture was applied by a liquid phase process, and calcined under a reduced pressure of O.lPa to less than atmospheric pressure in a temperature range of 900 to less than 1200 ° C to form an intermediate layer made of a cerium-based oxide. Later, an RE-based superconducting layer is formed on this intermediate layer.
- the intermediate layer on the metal substrate is formed of a cerium-based oxide to which a specific rare earth element (Re) is added in a predetermined amount, thereby preventing cracks in the intermediate layer. It is possible to form an intermediate layer on the metal substrate, which can prevent the occurrence of such a problem, and is excellent in crystallinity such as in-plane orientation and orientation, and surface smoothness. As a result, it becomes possible to form a RE-based superconducting layer having excellent superconducting properties on this intermediate layer.
- Re rare earth element
- a mixture containing a predetermined amount of one or more elements selected from a specific Re in a ceramic is provided on the surface of a metal substrate. Coating by a liquid phase process and baking at a predetermined temperature range under controlled atmosphere to form an intermediate layer made of a cerium-based oxide, so that cracks in the intermediate layer can be prevented, and in-plane An intermediate layer having excellent crystallinity such as degree of orientation and orientation and surface smoothness can be formed on a metal substrate. As a result, an EE-based superconducting layer having excellent superconducting properties can be formed on the intermediate layer.
- an intermediate layer formed by adding Re to cerium is formed (under controlled atmosphere) on the surface of the metal substrate, and the RE-based superconductive layer is formed on the intermediate layer.
- the intermediate layer is required to have low reactivity with the superconductor, a small ratio of the difference in crystal lattice spacing (misfit), and a function to prevent diffusion of the underlying metal element. From this point of view, any of the crystal structures of the fluorite structure, the rare earth- 1 C structure or the pike structure is selected as the product structure suitable for the intermediate layer.
- the intermediate layer on the metal substrate can be made into a single layer.
- the misfit between the lattice constant of the a-axis 3.88 A of the Y-123 superconductor crystal and the above oxide crystal lattice is less than 8%, but this misfit varies depending on the composition and is possible. If there is, it is desirable to be 1% or less.
- the amount of Re added to the intermediate layer in the first embodiment and the amount of Re contained in the mixture in the second embodiment are 5 to 90 mol%, preferably 20 to 60 mol% in terms of metal content. Selected.
- the method for forming the intermediate layer in the first embodiment includes physical vapor deposition such as PLD, e-beam vapor deposition, sputtering, chemical vapor deposition such as chemical vapor deposition (CVD), and oxide self-alignment process. It is possible to use various film forming methods via gas-phase processes such as IBAD and ISD, and liquid-phase processes such as MOD (Metal-Organic Deposition). The use of the MOD method or the PLD method is preferred in terms of ease and production speed.
- the method of forming the intermediate layer in the second embodiment various film forming methods can be used via a liquid phase process, but the MOD method is adopted in view of ease of manufacturing and manufacturing speed. Is done.
- the above-mentioned MOD method is known as a method of manufacturing by a non-vacuum process.
- the MOD method includes a trifluoroacetic acid salt (TFA salt) containing a predetermined molar ratio of each metal element constituting the intermediate layer.
- TFA salt trifluoroacetic acid salt
- the firing of the intermediate layer by the MOD method is performed under a reduced pressure of 0.1 to less than atmospheric pressure (for example, 800 Pa), and in particular, by firing in a pressure range of 10 to 500 Pa, the crystallization temperature can be lowered, and The intermediate layer can be fired at a low temperature of C or lower. This is effective in reducing the rate at which the underlying metal element diffuses into the intermediate layer when a metal tape is used as the substrate. If the firing is less than 0.1 Pa, random crystallization occurs before the film grows epitaxially, and the orientation of the intermediate layer is significantly reduced. Further, a pressure range of 50 to 500 Pa is preferably employed.
- the firing temperature of the intermediate layer is 900 to: L is performed in a temperature range of less than 200 ° C. If the sintering temperature is lower than 900 ° C, it is difficult to obtain a biaxially oriented film. If the sintering temperature is higher than 1200 ° C, the film is decomposed during sintering and it is difficult to obtain a target oxide.
- the firing temperature of the intermediate layer is preferably in the range of 950 to 1150 ° C.
- Metal substrates include Ni, Ag and their alloys, such as biaxially oriented metal tape made of Ni-V and Ni-W alloys, and non-oriented Ni, Ag and their alloys Or a metal tape made of a heat-resistant alloy such as sus, Hastelloy, or Inconel.
- the intermediate layer is formed on a metal substrate, all the methods described above as the method for forming the intermediate layer can be applied to the oriented metal tape, and the non-oriented metal tape in which the substrate itself has no orientation can be applied. , IBAD method and ISD method apply. As described above, when the intermediate layer is formed by the MOD method or the PLD method, it is preferable to use a highly-oriented metal substrate as the metal substrate.
- the firing atmosphere should be a reducing atmosphere gas containing 0.1 to 10% of ⁇ in Ar and N 2 gas. Is preferred.
- the H 2 concentration is less than 0.1%, NiO is generated on the Ni surface and significantly inhibits the epitaxy of the intermediate layer film.
- the H 2 concentration exceeds 10%, the gas is reduced. This is because the target oxide cannot be obtained because the power becomes too strong.
- an orientation control and diffusion prevention layer of 0.2 ⁇ m or less formed by a gas phase process such as the PLD method and the sputtering method is provided between the intermediate layer formed by the MOD method and the metal tape. Also, further, the front surface smoothness of deposited fabricated as CAP layer on the intermediate layer of 0.2 ⁇ ⁇ below Ce0 2, Ce-Re-0 film in PLD or sputtering in the MOD method that It is also effective to improve.
- the number of times the precursor film of the intermediate layer film is applied to the surface of the metal substrate by the MOD method is not limited at all, and the coating-calcination (drying) process is performed a plurality of times in order to obtain a desired film thickness. Techniques can also be adopted.
- a method of forming a superconducting layer on the intermediate layer formed on the metal substrate as described above a PLD method, a physical vapor deposition method such as e-beam vapor deposition, a chemical vapor deposition method such as a chemical vapor deposition method such as a CVD method, or the like.
- the film can be formed by various methods such as a film forming method via a liquid phase process such as the MOD method as in the case of the intermediate layer.
- the intermediate layer according to the present invention may be any of the above-described methods for forming a superconducting layer, wherein a precursor obtained by calcining TFA (TFA-MOD method) or a precursor containing F such as e-beam or PLD (ex-situ This method is very effective for forming a YBCO film by forming a film on the tape surface and then firing it.
- the precursor film contains F, Since water vapor is used during calcining, HF is generated during calcination and main calcining, and accordingly, the acid resistance of the intermediate layer becomes a problem.
- the intermediate layer according to the present invention is a Ce-based oxide. Excellent acid resistance.
- the intermediate layer according to the present invention can prevent the generation of cracks and can be made thicker. Therefore, it is not necessary to form an intermediate layer having a multilayer structure via a YSZ layer as in the above-described ABiTS method.
- the EE-based superconducting layer can be formed directly on the cerium-based oxide layer.
- Each mixed solution of Ce-Gd, Ce-Y, Ce-Yb and Ce-Gd-Yb is prepared using each 0.2 mol ZL naphthenic acid solution of Ce, Cd, Y and Yb, and this mixed solution is 10 mm X 5 mm Coating was performed by spin coating on a ⁇ 100 ⁇ 001> oriented Ni substrate of the same size as above. The rotation speed at this time was 3,000 rpm. The coated substrate was calcined at 200 ° C for 15 minutes in the air, and then fired at 1,000 ° C for 1 hour in an Ar-H 2 (2%) atmosphere. To form an intermediate layer.
- a YBCO (Y-123) superconducting layer was formed on the above-mentioned intermediate layer by a MOD method using trifluoroacetate (TFA-MOD).
- the superconducting layer For the superconducting layer, apply a mixed solution of trifluoroacetate containing each element of Y, Ba and Cu at a predetermined ratio on the intermediate layer, and calcine at 250 ° C for 15 hours in an oxygen atmosphere containing water vapor. After heat treatment, it was formed by baking at 760 to 800 ° C for 1 to 3 hours in an oxygen atmosphere containing Ar—O 2 (500 to 1,000 ppm) containing water vapor.
- Ar—O 2 500 to 1,000 ppm
- Example 2 100 Good C, C, C, C, ⁇ 500 0
- An intermediate layer and a superconducting layer were formed on an oriented Ni substrate in the same manner as in Example 1, except that a 0.2 mol ZL naphthenic acid solution of Ce or Y was used as a raw material solution for the intermediate layer.
- the results are also shown in Table 1.
- Ce0 2 or Y sintered body other targeting formed a more intermediate layers and superconducting layers in the same manner as in Example 5-8.
- an intermediate layer composed of a cerium-based oxide layer was formed by the MOD method or the PLD method, and a RE-based superconducting layer was formed on the intermediate layer by the MOD method.
- the RE-based superconductor does not crack in the intermediate layer, has excellent orientation of the intermediate layer and the superconducting layer, and shows a high Jc value.
- the oxide layer made of Ce or Y is used as the intermediate layer, the deviation is extremely small due to the occurrence of cracks in the intermediate layer or the low orientation of the superconducting layer. Results.
- the rotation speed at this time was 3000 rpm.
- firing is performed in an atmosphere of Ar-H 2 (2%) at a temperature in the temperature range of 900 1150 ° C and a pressure in the pressure range of 10 500 Pa.
- an intermediate layer having a thickness of 100 to 600 mn was formed on the oriented Ni substrate.
- Table 4 shows the firing temperature, firing pressure, and film thickness for each example. Firing temperature Firing thickness CAP layer Intermediate layer Intermediate layer peak intensity (GPS) Jc (MA / cm 2 ) (° C) Pressure (nm) Orientation degree Crack production YBGO deposition
- Example 9 1000 100 200 4iff 98 ffp 5500 5200 1.8
- the superconducting layer is prepared by applying a mixed solution of trifluoroacetate containing each element of Y, Ba and Cu at a predetermined ratio on the intermediate layer, and temporarily immersing at 250 ° C for 15 hours in an oxygen atmosphere containing steam. was subjected to tempering heat treatment, Ar-0 2 containing steam (500 ⁇ : l, 000ppm) was formed by performing firing of seven hundred and forty to eight hundred ° CX 1 to 3 hours in an oxygen atmosphere.
- those having a CAP layer on the intermediate layer in the above examples are CeO 2 film on the intermediate layer which was formed by the MOD method (film thickness 0.05 / zm) was formed by the PLD method.
- Table 4 also shows the degree of orientation of the intermediate layer, the presence or absence of cracks, the peak intensity of the intermediate layer, and the value of Jc of the Re-based superconductor manufactured as described above.
- Table 4 shows the firing temperature, firing pressure, and film thickness of each comparative example.
- a YBCO (Y-123) superconducting layer was formed on the above-mentioned intermediate layer by a TFA-MOD method in the same manner as in the example.
- Table 4 also shows the degree of orientation of the intermediate layer, the presence or absence of cracks, the peak intensity of the intermediate layer, and the value of Jc of the RE-based superconductor manufactured as described above.
- the intermediate layer and the BCO calcined film is reacted YBCO film does not grow when YBCO firing, the intermediate layer The peak also drops significantly, and does not show a Jc value.
- the rare earth-based oxide superconductor and the method for producing the same according to the present invention are useful for tape-shaped rare-earth oxide superconductors suitable for use in devices such as superconducting magnets and superconducting cables.
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Abstract
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005506027A JP4709005B2 (ja) | 2003-05-07 | 2004-05-06 | 希土類系酸化物超電導体及びその製造方法 |
| US10/551,900 US7473670B2 (en) | 2003-05-07 | 2004-05-06 | Process for producing rare earth oxide superconductor |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-129368 | 2003-05-07 | ||
| JP2003-129369 | 2003-05-07 | ||
| JP2003129368 | 2003-05-07 | ||
| JP2003129369 | 2003-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004100182A1 true WO2004100182A1 (ja) | 2004-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/006406 Ceased WO2004100182A1 (ja) | 2003-05-07 | 2004-05-06 | 希土類系酸化物超電導体及びその製造方法 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US7473670B2 (ja) |
| JP (1) | JP4709005B2 (ja) |
| WO (1) | WO2004100182A1 (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007080876A1 (ja) * | 2006-01-13 | 2007-07-19 | International Superconductivity Technology Center, The Juridical Foundation | 希土類系テープ状酸化物超電導体 |
| JP2007526199A (ja) * | 2004-01-16 | 2007-09-13 | アメリカン・スーパーコンダクター・コーポレーション | ナノドットフラックス・ピン止めセンターを有する酸化物膜 |
| JP2007234531A (ja) * | 2006-03-03 | 2007-09-13 | Internatl Superconductivity Technology Center | テープ状酸化物超電導線材の製造方法およびその中間層熱処理装置 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9165478B2 (en) * | 2003-04-18 | 2015-10-20 | International Business Machines Corporation | System and method to enable blind people to have access to information printed on a physical document |
| JP4254823B2 (ja) * | 2006-08-30 | 2009-04-15 | カシオ計算機株式会社 | 反応装置及び電子機器 |
| DE102008016257B4 (de) * | 2008-03-29 | 2010-01-28 | Zenergy Power Gmbh | Hochtemperatursupraleiter-Schichtanordnung und Verfahren zur Herstellung einer solchen |
| TWI688131B (zh) * | 2016-09-14 | 2020-03-11 | 日商東芝記憶體股份有限公司 | 半導體裝置 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111080A (ja) * | 1997-10-01 | 1999-04-23 | International Superconductivity Technology Center | 高臨界電流密度をもつ超電導線材 |
| JP2002075079A (ja) * | 2000-08-29 | 2002-03-15 | Sumitomo Electric Ind Ltd | 高温超電導厚膜部材およびその製造方法 |
| JP2003034527A (ja) * | 2001-05-15 | 2003-02-07 | Internatl Superconductivity Technology Center | 厚膜テープ状酸化物超電導体及びその製造方法 |
| JP2003323822A (ja) * | 2002-05-02 | 2003-11-14 | Sumitomo Electric Ind Ltd | 薄膜超電導線材およびその製造方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2726399B1 (fr) * | 1994-10-27 | 1997-01-10 | Alsthom Cge Alcatel | Procede pour la preparation d'un substrat en vue du depot d'une couche mince de materiau supraconducteur |
| EP1195819A1 (en) * | 2000-10-09 | 2002-04-10 | Nexans | Buffer layer structure based on doped ceria for providing optimized lattice match with a YBCO layer in a conductor and process of manufacturing said structure |
| US20040157747A1 (en) * | 2003-02-10 | 2004-08-12 | The University Of Houston System | Biaxially textured single buffer layer for superconductive articles |
-
2004
- 2004-05-06 JP JP2005506027A patent/JP4709005B2/ja not_active Expired - Fee Related
- 2004-05-06 US US10/551,900 patent/US7473670B2/en not_active Expired - Fee Related
- 2004-05-06 WO PCT/JP2004/006406 patent/WO2004100182A1/ja not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111080A (ja) * | 1997-10-01 | 1999-04-23 | International Superconductivity Technology Center | 高臨界電流密度をもつ超電導線材 |
| JP2002075079A (ja) * | 2000-08-29 | 2002-03-15 | Sumitomo Electric Ind Ltd | 高温超電導厚膜部材およびその製造方法 |
| JP2003034527A (ja) * | 2001-05-15 | 2003-02-07 | Internatl Superconductivity Technology Center | 厚膜テープ状酸化物超電導体及びその製造方法 |
| JP2003323822A (ja) * | 2002-05-02 | 2003-11-14 | Sumitomo Electric Ind Ltd | 薄膜超電導線材およびその製造方法 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007526199A (ja) * | 2004-01-16 | 2007-09-13 | アメリカン・スーパーコンダクター・コーポレーション | ナノドットフラックス・ピン止めセンターを有する酸化物膜 |
| WO2007080876A1 (ja) * | 2006-01-13 | 2007-07-19 | International Superconductivity Technology Center, The Juridical Foundation | 希土類系テープ状酸化物超電導体 |
| JP2007188756A (ja) * | 2006-01-13 | 2007-07-26 | Internatl Superconductivity Technology Center | 希土類系テープ状酸化物超電導体 |
| JP2007234531A (ja) * | 2006-03-03 | 2007-09-13 | Internatl Superconductivity Technology Center | テープ状酸化物超電導線材の製造方法およびその中間層熱処理装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2004100182A1 (ja) | 2006-07-13 |
| US20060258538A1 (en) | 2006-11-16 |
| US7473670B2 (en) | 2009-01-06 |
| JP4709005B2 (ja) | 2011-06-22 |
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