JPH02255506A - Production of oxide superconductor - Google Patents
Production of oxide superconductorInfo
- Publication number
- JPH02255506A JPH02255506A JP1080053A JP8005389A JPH02255506A JP H02255506 A JPH02255506 A JP H02255506A JP 1080053 A JP1080053 A JP 1080053A JP 8005389 A JP8005389 A JP 8005389A JP H02255506 A JPH02255506 A JP H02255506A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- substrate
- oxide superconductor
- irradiated
- laser beams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002887 superconductor Substances 0.000 title claims description 10
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000000470 constituent Substances 0.000 claims abstract description 4
- 230000001678 irradiating effect Effects 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 239000011247 coating layer Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229940120693 copper naphthenate Drugs 0.000 description 1
- SEVNKWFHTNVOLD-UHFFFAOYSA-L copper;3-(4-ethylcyclohexyl)propanoate;3-(3-ethylcyclopentyl)propanoate Chemical compound [Cu+2].CCC1CCC(CCC([O-])=O)C1.CCC1CCC(CCC([O-])=O)CC1 SEVNKWFHTNVOLD-UHFFFAOYSA-L 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000005608 naphthenic acid group Chemical group 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は酸化物超電導体の製造方法に係わり、特に有機
金属塩の塗布、熱分解によって酸化物超電導膜を形成す
る方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing an oxide superconductor, and particularly to an improvement in a method for forming an oxide superconductor film by coating and thermal decomposition of an organic metal salt.
［従来の技術］
近年、酸化物超電導物質の開発が著しい速度で進められ
ており、Ｌａ系、Ｙ系、Ｂｉ系、ＴＩ系等の超電導物質
の利用が有力視されている。しかしながら、これらの物
質はその超電導特性に異方性、すなわち結晶方位による
特性の差が著しく、通常の合成法によって得られた原料
粉末を成型後、焼結しただけではランダムな結晶方位の
ものしか得られないため、実用的レベルに達する電気的
、磁気的特性が得られないという問題があった。[Prior Art] In recent years, the development of oxide superconducting materials has progressed at a remarkable speed, and the use of superconducting materials such as La-based, Y-based, Bi-based, and TI-based materials is considered promising. However, the superconducting properties of these materials are anisotropic, that is, there are significant differences in properties depending on the crystal orientation, and simply molding and sintering the raw material powder obtained by normal synthesis methods will only result in properties with random crystal orientation. Therefore, there was a problem in that electrical and magnetic properties reaching a practical level could not be obtained.
酸化物超電導体を製造する方法の一つとして、有機金属
塩を含む溶液を基板上に塗布した後、焼成することによ
って膜状の超電導体を得る方法が知られている。この方
法は塗布、仮焼結を複数回繰返した後、焼結することが
できるため、膜厚の制御が容易であり、かつその方法も
簡単であるという利点を有する。As one of the methods for producing an oxide superconductor, a method is known in which a solution containing an organic metal salt is applied onto a substrate and then baked to obtain a film-like superconductor. This method allows sintering to be carried out after repeating coating and pre-sintering several times, so it has the advantage that the film thickness can be easily controlled and the method is also simple.
［発明が解決しようとする課題）
しかしながら、上記の方法においては、有機物を用いる
ため超電導体内部に不純物として炭素が残存し、超電導
物質は得られるものの、その臨界電流密度は低い値しか
得られないという問題がある。[Problem to be solved by the invention] However, in the above method, since an organic substance is used, carbon remains as an impurity inside the superconductor, and although a superconducting material is obtained, the critical current density thereof is only a low value. There is a problem.
本発明は、上記の難点を解決するためになされたもので
、有機金属塩の塗布、熱分解により超電導体を製造する
場合に、結晶の配向性を向上させ、かつ不純物を効率的
に除去することにより臨界電流密度を向上させることの
できる方法を提供することをその目的とする。The present invention has been made in order to solve the above-mentioned difficulties, and is intended to improve crystal orientation and efficiently remove impurities when producing superconductors by applying organic metal salts and thermal decomposition. The object is to provide a method that can improve the critical current density.
［課題を解決するための手段］
上記目的を達成するために本発明の酸化物超電導体の製
造方法は、基体上に酸化物超電導物質の構成元素を含む
有機金属塩を含む溶液を塗布した後、この塗布層に酸素
雰囲気下でレーザビームを照射し、結晶化させると同時
に炭素を揮散させるものである。[Means for Solving the Problems] In order to achieve the above object, the method for producing an oxide superconductor of the present invention includes applying a solution containing an organic metal salt containing constituent elements of an oxide superconducting substance onto a substrate, and then This coating layer is irradiated with a laser beam in an oxygen atmosphere to crystallize it and at the same time volatilize the carbon.
上記のレーザビームの照射と同時に紫外線を照射し、光
励起された高エネルギーのオゾンを発生させることによ
り、より効果的に不純物を除去することができる。Impurities can be removed more effectively by irradiating ultraviolet rays simultaneously with the laser beam irradiation to generate optically excited high-energy ozone.
本発明における酸化物超電導物質としては特に限定され
ず、たとえばＬａ−Ｂａ−Ｃｕ−０系、Ｌａ−８ｒ−Ｃ
ａ−Ｃｕ−０系、Ｙ−Ｂａ−Ｃｕ−０系、Ｂ１−３ｒ−
Ｃａ−Ｃｕ−０系、Ｔ １−Ｄａ−Ｃａ−Ｃｕ−０系等
の酸化物を挙げることができる。また、上記の有機金属
塩としては、炭酸塩や、脂肪酸、樹脂酸、ナフテン酸等
のアルカリ塩以外の金属塩、すなわち金属石けんを用い
ることができる。また、本発明におけるレーザビームと
しては、Ａｒ、 ＷＡＧ 、 ＣＯ２等のＣＷ（連続）
レーザを使用することができる。The oxide superconducting material in the present invention is not particularly limited, and includes, for example, La-Ba-Cu-0, La-8r-C
a-Cu-0 series, Y-Ba-Cu-0 series, B1-3r-
Examples include Ca-Cu-0-based oxides, T1-Da-Ca-Cu-0-based oxides, and the like. Moreover, as the above-mentioned organic metal salt, metal salts other than alkali salts such as carbonates, fatty acids, resin acids, naphthenic acids, ie, metal soaps can be used. Further, as the laser beam in the present invention, CW (continuous) such as Ar, WAG, CO2, etc.
Lasers can be used.
例えば、ビーム系２０〜５０μｍφ程度のものを使用し
て、１〜１０ｃｍ／ｓｅｃの走査速度で移動させる。For example, a beam system of about 20 to 50 μm in diameter is used and moved at a scanning speed of 1 to 10 cm/sec.
この場合走査方向に配向した結晶を得るためにツインビ
ーム、トリプルビーム、スリットビーム等を用い、走査
方向に大きな温度勾配を形成することができる。In this case, in order to obtain crystals oriented in the scanning direction, a twin beam, triple beam, slit beam, etc. can be used to form a large temperature gradient in the scanning direction.
［作用］
本発明においては、レーザビームの走査により非常に狭
い帯域で急速に溶融、凝固させることができるため、非
常に大きな温度勾配を達成することができるとともに、
不純物の炭素を短時間で揮発させることができる。さら
に、ビーム速度を制御することにより、高い配向性を有
する結晶が得られ、臨界電流密度を向上させることがで
きる。[Function] In the present invention, since it is possible to rapidly melt and solidify in a very narrow band by scanning a laser beam, it is possible to achieve a very large temperature gradient, and
Impurity carbon can be volatilized in a short time. Furthermore, by controlling the beam speed, highly oriented crystals can be obtained and the critical current density can be improved.
［実施例］
ナフテン酸イツトリウム、ナフテン酸バリウムおよびナ
フテン酸銅の所定量をＹ：Ｂａ：Ｃｕ −１：２：３と
なるように秤量して、トルエンに溶解せしめて５νｔ％
の溶液を得た。この溶液をＭｇＯ基板上に塗布し、１０
０℃に加熱して溶媒を揮発させ、次いで５００℃に加熱
して仮焼結した。このような塗布→仮焼結の工程を２０
回繰返して基板上に厚さ５μｌの被膜を形成した。この
被膜に出力５ｗ、ビーム径５０μ■φ、ビーム焦点間距
離１００μｌの２本のＹＡＧレーザ（ツインビーム）を
酸素加圧下で１０ｃｍ／ｓｅｅで照射し、同時に紫外線
を照射して被膜を結晶化させた。このようにして得られ
た超電導被膜の臨界温度（Ｔｃ）は９０Ｋ、臨界電流密
度（Ｊ ｃ）は７７に、ＯＴでｔｏ３〜１０４＾／ｃ−
であった。[Example] Predetermined amounts of yttrium naphthenate, barium naphthenate, and copper naphthenate were weighed so that the ratio was Y:Ba:Cu -1:2:3, and dissolved in toluene to give 5vt%.
A solution of was obtained. This solution was applied onto an MgO substrate, and
It was heated to 0°C to volatilize the solvent, and then heated to 500°C for temporary sintering. This process of coating → temporary sintering takes 20 minutes.
This was repeated several times to form a film with a thickness of 5 μl on the substrate. This film was irradiated with two YAG lasers (twin beams) with an output of 5 W, a beam diameter of 50 μΦ, and a beam focal length of 100 μl at a rate of 10 cm/see under oxygen pressure, and at the same time, ultraviolet rays were irradiated to crystallize the film. Ta. The critical temperature (Tc) of the superconducting film obtained in this way was 90K, the critical current density (Jc) was 77, and the OT was to3~104^/c-
Met.
一方、上記の基板上に形成した被膜に９７０℃×ｌＯ分
間および８００℃Ｘ２０時間の熱処理を施した酸化物被
膜のＴｃおよびＪｃはそれぞれ９０Ｋ 、 １０２Ａ／
Ｇｌｌ ”以下であった。On the other hand, the Tc and Jc of the oxide film formed on the above substrate and subjected to heat treatment at 970°C for 1O minutes and at 800°C for 20 hours are 90K and 102A/, respectively.
Gll” or less.
［発明の効果］
以上述べたように本発明によれば、レーザビームの照射
により高い配向性の結晶体を得ることができるとともに
、酸化物超電導物質に残存し易い不純物を除去すること
ができる。これにより、超電導特性の優れた膜体を得る
ことができる。[Effects of the Invention] As described above, according to the present invention, a highly oriented crystal can be obtained by laser beam irradiation, and impurities that tend to remain in the oxide superconducting material can be removed. Thereby, a film body with excellent superconducting properties can be obtained.
Claims (2)
金属塩を含む溶液を塗布した後、この塗布層に酸素雰囲
気下でレーザビームを照射し、結晶化させると同時に炭
素を揮散させることを特徴とする酸化物超電導体の製造
方法。(1) After applying a solution containing an organic metal salt containing the constituent elements of an oxide superconducting material onto a substrate, this applied layer is irradiated with a laser beam in an oxygen atmosphere to crystallize and at the same time volatilize carbon. A method for producing an oxide superconductor characterized by:
ン発生させることを特徴とする請求項１記載の酸化物超
電導体の製造方法。(2) The method for producing an oxide superconductor according to claim 1, characterized in that ozone is generated by irradiating ultraviolet rays at the same time as irradiating the laser beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1080053A JPH02255506A (en) | 1989-03-30 | 1989-03-30 | Production of oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1080053A JPH02255506A (en) | 1989-03-30 | 1989-03-30 | Production of oxide superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02255506A true JPH02255506A (en) | 1990-10-16 |
Family
ID=13707497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1080053A Pending JPH02255506A (en) | 1989-03-30 | 1989-03-30 | Production of oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02255506A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009252641A (en) * | 2008-04-09 | 2009-10-29 | National Institute Of Advanced Industrial & Technology | Method of producing superconducting oxide material |
-
1989
- 1989-03-30 JP JP1080053A patent/JPH02255506A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009252641A (en) * | 2008-04-09 | 2009-10-29 | National Institute Of Advanced Industrial & Technology | Method of producing superconducting oxide material |
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