JPS63225531A - Oxide superconductive material - Google Patents
Oxide superconductive materialInfo
- Publication number
- JPS63225531A JPS63225531A JP62058441A JP5844187A JPS63225531A JP S63225531 A JPS63225531 A JP S63225531A JP 62058441 A JP62058441 A JP 62058441A JP 5844187 A JP5844187 A JP 5844187A JP S63225531 A JPS63225531 A JP S63225531A
- Authority
- JP
- Japan
- Prior art keywords
- oxide
- phase
- single phase
- critical
- magnetic field
- 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
- 239000000463 material Substances 0.000 title claims abstract description 13
- 229910052727 yttrium 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
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 229910052788 barium Inorganic materials 0.000 claims abstract description 3
- 229910052796 boron Inorganic materials 0.000 claims abstract 4
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract 3
- 229910052712 strontium Inorganic materials 0.000 claims abstract 3
- 229910052765 Lutetium Inorganic materials 0.000 claims abstract 2
- 229910052769 Ytterbium Inorganic materials 0.000 claims abstract 2
- 229910052782 aluminium Inorganic materials 0.000 claims abstract 2
- 229910052791 calcium Inorganic materials 0.000 claims abstract 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims abstract 2
- 230000007547 defect Effects 0.000 claims abstract 2
- 229910052706 scandium Inorganic materials 0.000 claims abstract 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 claims 1
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 10
- 239000000203 mixture Substances 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 3
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 abstract 2
- 239000002887 superconductor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910002561 K2NiF4 Inorganic materials 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 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
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は高い臨界温度及び高い臨界磁場を有する酸化物
超伝導材料に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to oxide superconducting materials with high critical temperatures and high critical magnetic fields.
（従来の技術）
１９Ｋ６年参月にＩＢＭチェーリッヒ研究所のＢｅｄｎ
ｏｒｚとＭＬＩｌｌｅｒがＬａ−Ｂａ−Ｃｕの酸化物で
臨界温度Ｔｃの高い材料が得られる予言がなされた（
Ｔ、 Ｇ、 Ｂｅｄｎｏｒｚ ａｎｄ Ｋ、 Ａ、 Ｍ
ＬＩＩＩｅｒ＋ Ｚ、 Ｐｈｙｓ、 Ｂ６偽／１５′り
（／りＫ６））。この結果から東大の日中。(Prior technology) Bedn of IBM Cherich Research Institute in March 19K6
It was predicted that a material with a high critical temperature Tc could be obtained by using La-Ba-Cu oxides with orz and MLIller (
T, G, Bednorz and K, A, M
LIIIer+ Z, Phys, B6 false/15'ri (/riK6)). From this result, the University of Tokyo during the day.
苗木グループかに＠ Ｎｉ Ｋ４型の結晶構造を持つＬ
ａ−８ｒ−Ｃｕの酸化物で≠ＯＫ前後の高いＴｃを示す
材料を作製した。しかしながら、この材料系は≠ＯＫ前
後が最高で、これ以上の高い臨界温度は得られない欠点
を有していた（ Ｋ、 Ｋ１５ｈｉｏ、Ｋ。Seedling group crab @ Ni L with K4 type crystal structure
A material showing a high Tc of around ≠OK was produced using an oxide of a-8r-Cu. However, this material system had the drawback that the highest critical temperature was around ≠OK, and a higher critical temperature could not be obtained (K, K15hio, K.
Ｋｉｔａｚａｗａ＋ Ｓ、Ｋａｎｂｅ＋ Ｉ、 Ｙａｓ
ｕｄａ＋ Ｎ、Ｓｕｇｉｉ＋ ＨｌＴａｋａｇｉ ＋
Ｓ、Ｕｃｈｉｄａ ＋ Ｋ、 Ｆｕｅｋｉ ａｎｄ
Ｓ、 Ｔａｎａｋａ ：Ｏｈｅｍ、 Ｌｅｉｔ、（／
りＫ７）１７２り）。これに対し、ヒユーストン大学の
Ｗｕと Ｏｈｕ らによりＹｌ、２ ＢａｏＪＣｕｌ
Ｏの組成で２３ＫからｒＯＫ の間で超伝導へ転移す
る報告がなされた（ Ｐ、Ｈ，Ｈｏｒｅｔ ａＬ＋
Ｐｈｙｓ、 Ｒｅｖ、 Ｌｅｔｔ、ｊ♂、 タＯ♂
（／りＫ７））。Kitazawa+ S, Kanbe+ I, Yas.
uda+ N, Sugii+ HlTakagi+
S, Uchida + K, Fueki and
S, Tanaka: Ohem, Leit, (/
riK7) 172ri). On the other hand, Wu and Ohu et al.
It has been reported that there is a transition to superconductivity between 23K and rOK at the composition of O (P, H, HoretaL+
Phys, Rev, Lett, j♂, TaO♂
(/riK7)).
また科学技術庁の金属材料技術研究所の戸叶らもＹ（１
，４１３ａＱ、６０ｕＩ０３の組成で７２３Ｋから２３
にの間で超伝導へ転移する報告がなされた。しかしなが
ら、これらの組成は超伝導を示す相の他に超伝導を示さ
ない相が混合しており、超伝導への転移点は高いものの
臨界電流、臨界磁場が小さいという欠点を有していた。In addition, Togana et al. of the Institute of Metals and Materials Technology of the Science and Technology Agency
, 413aQ, 723K to 23 with a composition of 60uI03
A transition to superconductivity was reported between . However, these compositions contain a mixture of phases that exhibit superconductivity and phases that do not exhibit superconductivity, and although the transition point to superconductivity is high, they have the disadvantage that the critical current and critical magnetic field are small.
また超伝導に転移する温度範囲も１０Ｋ以上を必要とす
る欠点を有していた。Moreover, it has the disadvantage that the temperature range for transition to superconductivity requires a temperature range of 10 K or higher.
（発明が解決しようとする問題点）
本発明はこれまで混合相であった高温超伝導体の低い臨
界電流、臨界磁場特性及び広い超伝導転移温度領域を有
する点を解決した単−相の高温超伝導体を提供しようと
するものである。(Problems to be Solved by the Invention) The present invention is a single-phase high-temperature superconductor that solves the problems of high-temperature superconductors, which have hitherto been mixed-phase, having a low critical current, critical magnetic field characteristics, and a wide superconducting transition temperature range. The aim is to provide a superconductor.
（問題点を解決するための手段および作用）本発明はペ
ロブスカイト型酸化物で発明者が初めて見出したＡｔＢ
４０ｕ Ｏ１４＋Ｙ 構造の単−相を有する酸化物超
伝導体を提供する。従来の混合相からなる酸化物超伝導
と比べて単−相の酸化物超伝導体であることが異なる。(Means and effects for solving the problems) The present invention is a perovskite-type oxide, and the AtB
An oxide superconductor having a single phase with a 40u O14+Y structure is provided. The difference is that it is a single-phase oxide superconductor compared to the conventional mixed-phase oxide superconductor.
（実施例）
Ａ４１ｊ４（ｊＬＩ６Ｌ）１４＋ｙＬ Ｏ（）’ ＜ｆ
） 荷造においてＡをイツトリウム、Ｂをバリウムとし
た場合の酸化物超伝導体についての実施例を説明する。(Example) A41j4(jLI6L)14+yL O()'<f
) An example of an oxide superconductor in which A is yttrium and B is barium in packaging will be described.
Ｙｚ Ｂａ４０ｕ６０、＋＋Ｙ はＹ、Ｏ５を１モル
ＢａＯＯ８を≠モル、ＯｕＯを６モルを混合し、酸素中
で ２ｔ ｏ ’ｃ２≠時間熱処理した後、粉砕して再
び粉末にした後ポリビニルアルコール１０％水溶液を前
記粉末に３〜７重量％添加してビレット状に圧粉成形し
再び酸素中で１０００℃、！時間熱処理して作製する。Yz Ba40u60, ++Y is Y, 1 mol of O5, ≠ mol of BaOO8, and 6 mol of OuO are mixed, heat treated in oxygen for 2t o'c2≠ hours, crushed to powder again, and then mixed with a 10% polyvinyl alcohol aqueous solution. was added to the powder in an amount of 3 to 7% by weight, compacted into a billet, and then heated again at 1000°C in oxygen. Produced by heat treatment for a period of time.
このように作製したＹ−Ｂａ−Ｏｕ の酸化物は第１
図に示すようなＡ２ Ｂ４０ｕａ ＯＩ４＋）’ 構
造の単−相をとる。単−相からなることは、第！図に示
したＸ線回折図より確認された。この結果、第２図に示
した温度に対する電気抵抗の変化において、り３Ｋから
り２にの約／にという小さな温度範囲で超伝導転移が生
じる。また、超伝導特性に対する磁場の影響を従来知ら
れているＹ。、４ Ｂａ６．６０ｕｌ ｏ。The Y-Ba-Ou oxide prepared in this way is the first
A single phase with an A2 B40ua OI4+)' structure as shown in the figure is taken. The fact that it consists of a single phase is number one! This was confirmed from the X-ray diffraction diagram shown in the figure. As a result, in the change in electrical resistance with respect to temperature shown in FIG. 2, a superconducting transition occurs in a small temperature range of about 3K to about 2K. In addition, the influence of magnetic fields on superconducting properties of Y is conventionally known. , 4 Ba6.60ul o.
−スフ
と比較して第３図に示す。第３図は／ア←の磁場の下で
の電気抵抗の変化を示す。Ｙ６．４ Ｂ ａ６，６０ｕ
ＩＯ２は超伝導相と非導電性の相が混合しておシ超伝
導相が弱い結合体となっているため、／−Ｐラスの磁場
によって超伝導が簡単に破壊されてしまうのに対し、Ｙ
！ Ｂａ４（３ｕ６０１４−１−ｙはほとんど影響を受
けない。- Shown in Figure 3 in comparison with Sufu. Figure 3 shows the change in electrical resistance under the magnetic field of /A←. Y6.4 B a6,60u
In IO2, a superconducting phase and a non-conducting phase are mixed, and the superconducting phase forms a weak bond, so the superconductivity is easily destroyed by the magnetic field of /-P. Y
! Ba4(3u6014-1-y is hardly affected.
以上の結果から明らかなように従来の技術に比べて超伝
導転移の温度範囲を小さくしたこと及び磁場に対する影
響を受けに＜＜シたことの改善があった・
〔実施例２〕
Ａｓ Ｂ４０ｕ６０＋＊＋Ｙにおいて人をランタン、Ｂ
をパと同様である。温度に対する電気抵抗の変化をに、
ＮｉＦ、構造のＬａ１Ｊｌｌ １３ａ（ｊｌｌｌ ０ｕ
１０４と比較して第≠図に示す。本発明の構造による酸
化物超伝導材料はＬａＢａ−０ｕの酸化物としては世界
最高の臨界磁場を有し、 Ｋ、ＮｉＦ、構造のものよ
りも／Ｊ”Ｋも高い。As is clear from the above results, compared to the conventional technology, the temperature range of superconducting transition was made smaller and the influence of the magnetic field was significantly improved. [Example 2] As B40u60+* ＋Y makes a person a lantern, B
is similar to Pa. The change in electrical resistance with respect to temperature,
NiF, structure La1Jll 13a (jllll 0u
A comparison with 104 is shown in FIG. The oxide superconducting material with the structure of the present invention has the world's highest critical magnetic field as a LaBa-0u oxide, and /J''K is higher than that of the K, NiF, structure.
また、上部臨界磁場Ｈｃ２はｔテμまでの測定では１本
特許の構造のものはに、ＮｉＦ、構造のものよシも少な
くとも約２倍優れていることが明らかとなった。Furthermore, it has been revealed that the upper critical magnetic field Hc2 is at least twice as good as that of the structure of this patent and that of the NiF structure when measured up to tteμ.
〔実施例３〕
示す。表／に見られるようにＡｔ Ｂ４０ｕ６０ｔ４＋
Ｙ 構造の単−相をとればいずれも高い臨界温度と小
さな温度範囲で超伝導転移を行う。[Example 3] Shown. At B40u60t4+ as seen in table/
All single-phase Y structures undergo a superconducting transition at a high critical temperature and within a small temperature range.
表 ／
（発明の効果）
以上説明したようにＡｘ Ｂ４ ｃｕａ Ｏ１４＋）’
（０＜ｙ ＜２）構造の単−相で酸化物超伝導材料
を構成したことにより、高い臨界温度と小さな超伝導転
移温度領域及び高い臨界磁場特性が得られる利点がある
。Table / (Effect of the invention) As explained above, Ax B4 cua O14+)'
By configuring the oxide superconducting material with a single phase having a (0<y<2) structure, there are advantages in that a high critical temperature, a small superconducting transition temperature region, and high critical magnetic field characteristics can be obtained.
第１図は本発明の酸化物超伝導材料の構造図。
第２図は本発明の酸化物超伝導材料の構造を有するＹ２
Ｂａ４００６０１４＋Ｙの温度に対する電気抵抗の変
化。
第３図は本発明の単−相を持つＹｔ Ｂａ４０ｕ６０＋
４＋ｙと混合相を持つＹ。、４１３ａＯ０６Ｃｕｌ ０
３の／テスラの磁場の下での伝導特性。
第≠図は本発明の酸化物超伝導材料の構造を有するＬａ
ｔＢａ４１ Ｃｕ６０１４＋Ｙ と Ｋ２ＮｉＦ４゛
構造のＬａｌ、８５ ＥｌａＱ、ｔｓ Ｏｕｔ ０４温
度に対スル電気抵抗Ｃ７）変化。
第５図は本発明のＹ２ Ｂａ４０ｕａ Ｏ＋＊＋Ｙ
のＸ線回折図である。
第１図FIG. 1 is a structural diagram of the oxide superconducting material of the present invention. Figure 2 shows Y2 having the structure of the oxide superconducting material of the present invention.
Change in electrical resistance of Ba4006014+Y with respect to temperature. Figure 3 shows Yt Ba40u60+ having a single phase according to the present invention.
4+y and Y with a mixed phase. , 413aO06Cul 0
Conduction properties under a magnetic field of 3/Tesla. Figure ≠ shows La having the structure of the oxide superconducting material of the present invention.
tBa41 Cu6014+Y and K2NiF4゛ structure Lal, 85 ElaQ, ts Out 04 Electrical resistance vs. temperature C7) Change. Figure 5 shows Y2 Ba40ua O++Y of the present invention.
It is an X-ray diffraction diagram of. Figure 1
Claims (1)
酸化物Ａ＿２Ｂ＿４Ｃｕ＿５Ｏ＿１＿４＿＋＿ｙ（０＜
ｙ＜２．５）構造を有し、Ａはイットリウム（Ｙ）、ラ
ンタン（Ｌａ）、イッテルビウム（Ｙｂ）、ルテチウム
（Ｌｕ）、スカンジウム（Ｓｃ）、アルミニウム（Ａｌ
）、ボロン（Ｂ）からなる群から選ばれた１又は２以上
の元素からなり、Ｂはバリウム（Ｂａ）、ストロンチウ
ム（Ｓｒ）、カルシウム（Ｃａ）からなる群から選ばれ
た１又は２以上の元素からなることを特徴とする酸化物
超伝導材料。Perovskite oxide belonging to the tetragonal system with oxygen defects A_2B_4Cu_5O_1_4_+_y (0<
y<2.5) structure, and A is yttrium (Y), lanthanum (La), ytterbium (Yb), lutetium (Lu), scandium (Sc), aluminum (Al
), boron (B), and B is one or more elements selected from the group consisting of barium (Ba), strontium (Sr), and calcium (Ca). An oxide superconducting material characterized by being composed of elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62058441A JPS63225531A (en) | 1987-03-13 | 1987-03-13 | Oxide superconductive material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62058441A JPS63225531A (en) | 1987-03-13 | 1987-03-13 | Oxide superconductive material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63225531A true JPS63225531A (en) | 1988-09-20 |
Family
ID=13084483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62058441A Pending JPS63225531A (en) | 1987-03-13 | 1987-03-13 | Oxide superconductive material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63225531A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63230526A (en) * | 1987-03-18 | 1988-09-27 | Kazuo Fueki | Compound superconductor and production thereof |
| JPS643014A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Superconducting material and production thereof |
| JPS643059A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| JPS643063A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconductive material |
| JPS643054A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| JPS643009A (en) * | 1987-03-19 | 1989-01-06 | Sumitomo Electric Ind Ltd | Superconducting material and production thereof |
| JPS6452616A (en) * | 1987-03-13 | 1989-02-28 | Sanyo Electric Co | Superconducting substance and production thereof |
| JPH0517203A (en) * | 1991-04-01 | 1993-01-26 | Semiconductor Energy Lab Co Ltd | Superconducting ceramics |
| JPH0517202A (en) * | 1991-04-01 | 1993-01-26 | Semiconductor Energy Lab Co Ltd | Superconducting ceramics |
| US7112556B1 (en) | 1987-03-25 | 2006-09-26 | Semiconductor Energy Laboratory Co., Ltd. | Superconducting ceramics |
-
1987
- 1987-03-13 JP JP62058441A patent/JPS63225531A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6452616A (en) * | 1987-03-13 | 1989-02-28 | Sanyo Electric Co | Superconducting substance and production thereof |
| JPS63230526A (en) * | 1987-03-18 | 1988-09-27 | Kazuo Fueki | Compound superconductor and production thereof |
| JPS643009A (en) * | 1987-03-19 | 1989-01-06 | Sumitomo Electric Ind Ltd | Superconducting material and production thereof |
| JPS643059A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| JPS643054A (en) * | 1987-03-22 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconducting material |
| US7112556B1 (en) | 1987-03-25 | 2006-09-26 | Semiconductor Energy Laboratory Co., Ltd. | Superconducting ceramics |
| JPS643014A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Superconducting material and production thereof |
| JPS643063A (en) * | 1987-03-28 | 1989-01-06 | Sumitomo Electric Ind Ltd | Production of superconductive material |
| JPH0517203A (en) * | 1991-04-01 | 1993-01-26 | Semiconductor Energy Lab Co Ltd | Superconducting ceramics |
| JPH0517202A (en) * | 1991-04-01 | 1993-01-26 | Semiconductor Energy Lab Co Ltd | Superconducting ceramics |
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