JPH0214826A - Oxide superconductor and production thereof - Google Patents
Oxide superconductor and production thereofInfo
- Publication number
- JPH0214826A JPH0214826A JP63164364A JP16436488A JPH0214826A JP H0214826 A JPH0214826 A JP H0214826A JP 63164364 A JP63164364 A JP 63164364A JP 16436488 A JP16436488 A JP 16436488A JP H0214826 A JPH0214826 A JP H0214826A
- Authority
- JP
- Japan
- Prior art keywords
- oxide superconductor
- oxide
- vanadium
- compound
- composition formula
- 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 abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000010304 firing Methods 0.000 claims description 8
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 claims description 4
- 229910001935 vanadium oxide Inorganic materials 0.000 claims description 4
- 150000003682 vanadium compounds Chemical class 0.000 claims description 2
- 239000005749 Copper compound Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 150000001622 bismuth compounds Chemical class 0.000 claims 1
- 229940043430 calcium compound Drugs 0.000 claims 1
- 150000001674 calcium compounds Chemical class 0.000 claims 1
- 150000001880 copper compounds Chemical class 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 150000003438 strontium compounds Chemical class 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 abstract description 8
- 239000010949 copper Substances 0.000 abstract description 8
- 229910052791 calcium Inorganic materials 0.000 abstract description 7
- 239000011575 calcium Substances 0.000 abstract description 7
- 229910052712 strontium Inorganic materials 0.000 abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052797 bismuth Inorganic materials 0.000 abstract description 5
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 abstract description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 5
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910016523 CuKa Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 150000004703 alkoxides Chemical class 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000634 powder X-ray diffraction Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- MSBGPEACXKBQSX-UHFFFAOYSA-N (4-fluorophenyl) carbonochloridate Chemical compound FC1=CC=C(OC(Cl)=O)C=C1 MSBGPEACXKBQSX-UHFFFAOYSA-N 0.000 description 1
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 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
- Inorganic Compounds Of Heavy Metals (AREA)
- Compositions Of Oxide Ceramics (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１
本発明は酸化物超伝導体およびその製造法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an oxide superconductor and a method for producing the same.
特に、本発明は高い臨界温度（Ｔｃ）を有する高温酸化
物超伝導体に関するものである。In particular, the present invention relates to high temperature oxide superconductors with high critical temperatures (Tc).
［従来の技術とその課題１
従来、酸化物超伝導体としてＢａ （Ｐｂ Ｂｉ ）
０３が知られていたが、この物質のＴｃは１２にであり
冷媒として液体ヘリウムを使用する必要があった。[Conventional technology and its problems 1 Conventionally, Ba (Pb Bi ) was used as an oxide superconductor.
03 was known, but this material had a Tc of 12 and required the use of liquid helium as a refrigerant.
最近、ＲＢａ２Ｃｕ３０７ ｘ（Ｒ；希土類元素）で示
される物質のなかにはＴｃが９０Ｋを越えるものが見出
され、冷媒として液体窒素が使用できるようになった。Recently, among substances represented by RBa2Cu307x (R; rare earth element), a substance with Tc exceeding 90K has been found, and liquid nitrogen has become usable as a refrigerant.
しかし超伝導材料として実用に供するためには、更に高
い臨界温度を有する材料が望ましい。However, in order to put it into practical use as a superconducting material, it is desirable to have a material with an even higher critical temperature.
［課題を解決するための手段１
本発明の目的は、窒素の液化温度以上で超伝導を示す酸
化物超伝導体を提供することにあり、かかる目自勺はビ
スマス、バナジウム、ストロンチウム、カルシウムおよ
び銅を含有する酸化物超伝導体により達成される。[Means for Solving the Problems 1] An object of the present invention is to provide an oxide superconductor that exhibits superconductivity above the liquefaction temperature of nitrogen. This is achieved with copper-containing oxide superconductors.
以下に本発明の詳細な説明する。The present invention will be explained in detail below.
本発明に係る酸化物超伝導体は、ビスマス、バナジウム
、ストロンチウム、カルシウムおよび銅の酸化物であっ
て、下記組成式、
ＢｉａＶ１３ＳｒγＣａδＣｕｅＯｘ
（式中、α、Ｉ３．γ、δ、εおよびＸはそれぞれの元
素のモル数を表わし、
α＝ ２．０−１３
０．２≦ｐ≦０，８
１．８≦γ≦２．２
１．８≦δ≦２．２
２．７≦８≦３．３
好ましくは、
α＝ ２．０−１３
０．４≦ｐ≦０．６
γ＝２．０
δ＝２．０
ε＝３．０
である。）
で示される。The oxide superconductor according to the present invention is an oxide of bismuth, vanadium, strontium, calcium, and copper, and has the following compositional formula: BiaV13SrγCaδCueOx (where α, I3.γ, δ, ε, and X are each Represents the number of moles of the element, α = 2.0-13 0.2≦p≦0,8 1.8≦γ≦2.2 1.8≦δ≦2.2 2.7≦8≦3.3 Preferably, α=2.0-13 0.4≦p≦0.6 γ=2.0 δ=2.0 ε=3.0.
本発明に係る酸化物超伝導体は、ビスマス、バナジウム
、ストロンチウム、カルシウムおよび銅の酸化物、炭酸
塩、水酸化物、硝酸塩、硫酸塩、蓚酸塩、塩化物、アル
コキサイド等を原料として製造することができる。これ
らの原料化合物から適宜選択して、Ｂｉ 、 Ｖ 、
Ｓｒ 、 ＣａおよびＣｕの原子比が前記組成になるよ
うに秤量し、粉末混合法、湿式共沈法、蒸発乾固法、ア
ルコキサイドによるゾルゲル法等、従来から知られてい
る均一混合を目的とする方法により混合される。得られ
た混合物は乾燥されたのち焼成される。The oxide superconductor according to the present invention can be produced using oxides, carbonates, hydroxides, nitrates, sulfates, oxalates, chlorides, alkoxides, etc. of bismuth, vanadium, strontium, calcium, and copper as raw materials. I can do it. By appropriately selecting from these raw material compounds, Bi, V,
Weigh so that the atomic ratios of Sr, Ca and Cu become the above composition, and aim for homogeneous mixing using conventionally known methods such as powder mixing method, wet coprecipitation method, evaporation to dryness method, sol-gel method using alkoxide, etc. Mixed by method. The resulting mixture is dried and then fired.
この際、固相反応を十分に進行させるためには、粉末を
加圧成形してペレット状で焼成することが好ましい。焼
成温度は、通常、各塩類を分解させるため、５００℃以
上で行なうことが好ましい。バナジウム化合物としては
酸化バナジウムが好ましく使用されるが、酸化バナジウ
ムの融点は６９０℃であるため、−次焼成を６８０℃以
下で十分性ない、酸化バナジウムが実質上認められなく
なった後、８３０〜８７０℃１好ましくは、８５０〜８
６０℃で二次焼成される。酸化バナジウムの消失はＸ線
回折により（五酸化バナジウムの主回折角は２θ：２０
．３°に現れる）検出することができる。二次焼成は、
少なくとも１時間は必要であり、好ましくは２４時間以
上、さらに好ましくは１２０時間以上行なうことが推奨
され、長時間焼成するほど得られる超伝導体の超伝導特
性が向上する。At this time, in order to allow the solid phase reaction to proceed sufficiently, it is preferable that the powder is press-molded and fired in the form of pellets. Generally, the firing temperature is preferably 500° C. or higher in order to decompose each salt. Vanadium oxide is preferably used as the vanadium compound, but since the melting point of vanadium oxide is 690°C, it is not sufficient to perform the second firing at 680°C or lower. ℃1 Preferably 850-8
Secondary firing is performed at 60°C. Vanadium oxide disappeared by X-ray diffraction (the main diffraction angle of vanadium pentoxide is 2θ:20
．． 3°) can be detected. The secondary firing is
At least one hour is required, preferably 24 hours or more, more preferably 120 hours or more, and the longer the firing time, the better the superconducting properties of the superconductor obtained.
このようにして得られた複合酸化物は超伝導特性につい
て解析することにより、Ｔｃ−ｌｌ０Ｋを有する酸化物
超伝導体であることを確認することができる。すなわち
、ＣｕＫａ線（１，５４１８Ａ ）による粉末Ｘ線回折
を行なうと、ビスマス、ストロンチウム、カルシウム、
および銅を必須成分として含む公知の酸化物超伝導体の
回折パターンに現れるものと同様のＴｃ−８０にの物質
による回折ピークおよびＴｃ−１１０にの物質による回
折ピークが現れる。その他に不純物であるＣｕｂ、 Ｃ
ａ２ＣｕＯ３等のピークおよび若干の不明ピークが現れ
る。本発明の焼結体は、１１０にの回折ピーク群を有す
る物質の体積分率が大きいはどＴｃが高くなる。焼結体
中での１１０にの回折ピーク群を有する物質の体積分率
の大小は粉末Ｘ線回折により、Ｔｃ−８０にの物質に特
異的に現れる２θ＝２３．３±０．２°の回折ピークの
強度（Ｌ）に対するＴｃ−１１０にの回折ピーク群を有
する物質に特異的に現れる２＜３ ＝ ２４．０±０．
２°の回折ピークの強度（Ｈ）の比率を求めることによ
り、便宜的に比較することが可能であり、Ｈ／Ｌ≧０．
１、特に、Ｈ／Ｌ≧１．０の酸化物超伝導体は極めて良
好な超伝導特性を示す。By analyzing the superconducting properties of the composite oxide thus obtained, it can be confirmed that it is an oxide superconductor having Tc-ll0K. That is, when powder X-ray diffraction is performed using CuKa radiation (1,5418A), bismuth, strontium, calcium,
A diffraction peak due to the substance at Tc-80 and a diffraction peak due to the substance at Tc-110 similar to those appearing in the diffraction pattern of a known oxide superconductor containing copper as an essential component appear. In addition, impurities Cub, C
Peaks such as a2CuO3 and some unknown peaks appear. In the sintered body of the present invention, the larger the volume fraction of the substance having the diffraction peak group at 110, the higher the Tc. The size of the volume fraction of a substance having a diffraction peak group at 110 in a sintered body is determined by powder X-ray diffraction at 2θ = 23.3 ± 0.2°, which appears specifically for a substance at Tc-80. 2<3 = 24.0±0. which appears specifically in a substance having a diffraction peak group at Tc-110 with respect to the intensity (L) of the diffraction peak.
By determining the ratio of the intensities (H) of the 2° diffraction peak, it is possible to conveniently compare, and H/L≧0.
1. In particular, oxide superconductors with H/L≧1.0 exhibit extremely good superconducting properties.
［実施例］
次に本発明を実施例により更に具体的に説明するが、本
発明はその要旨を越えない限り、以下の実施例に限定さ
れるものではない。[Examples] Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.
実施例１
酸化ビスマス（ＩＩＩ ） ０．８７７７ｇ 、酸化バ
ナジウム（Ｖ ） ０．１４６８ｇ 、炭酸ストロンチ
ウム０．７９４６ｇ、炭酸カルシウム０．５３８７ ｇ
、酸化銅（ＩＩ ） ０．６４２１ｇ （いずれも純度
９９．９％以上の粉末）をメハン乳鉢に入れ、エタノー
ルを約１ｍｅ添加し、スラリー状にして充分撹拌混合し
た。混合物のＢｉ 、 Ｖ 、 Ｓｒ 、 Ｃａおよび
Ｃｕの原子比は、１．４：０．６＋２．０＋２．０：３
．０である。Example 1 Bismuth (III) oxide 0.8777g, vanadium (V) oxide 0.1468g, strontium carbonate 0.7946g, calcium carbonate 0.5387g
, 0.6421 g of copper (II) oxide (all powders with a purity of 99.9% or higher) were placed in a Mehan mortar, and approximately 1 me of ethanol was added to form a slurry and thoroughly stirred and mixed. The atomic ratio of Bi, V, Sr, Ca and Cu in the mixture is 1.4:0.6+2.0+2.0:3
．． It is 0.
得られた混合粉末０．４ｇを、常法により加圧成形（１
ｔｏｎ ／ ｃｍ２） Ｌ、直径１０ｍｍのベレットを
作成した。このペレットを空気中にて６００ ’Ｃで２
４時間−次焼成し、次いで８６０℃で２４時時間法焼成
した後、５０℃／ ｈｒの降温速度で室温まで徐冷した
。0.4 g of the obtained mixed powder was press-molded (1
ton/cm2) L, a pellet with a diameter of 10 mm was created. This pellet was heated to 600'C in air for 2 hours.
After 4-hour secondary firing and then 24-hour firing at 860°C, it was slowly cooled to room temperature at a cooling rate of 50°C/hr.
得られた焼成物の電気抵抗および交流複素帯磁率の温度
依存性を測定した結果、１１０にで臨界ｌ益度に達し、
本物質が１１０に級超伝導体であることが確認された。As a result of measuring the temperature dependence of the electrical resistance and AC complex magnetic susceptibility of the obtained fired product, the critical gain was reached at 110,
It was confirmed that this material is a class 110 superconductor.
本物質のＣｕＫａ線（１，５４１８Ａ ）による粉末Ｘ
線回折の結果、不純物およびＴｃ−８０にの物質による
回折ピークに混じって、２θ＝４．８°、２θ＝ ２４
．０°、２θ：２６．２°およびその他の角度に、Ｔｃ
−１１０にの物質による回折ピークが得られた。得られ
たＸ線回折図を図−１に示した。Powder X of this substance by CuKa ray (1,5418A)
As a result of line diffraction, 2θ = 4.8°, 2θ = 24, mixed with the diffraction peaks due to impurities and Tc-80
．． At 0°, 2θ: 26.2° and other angles, Tc
A diffraction peak due to the substance at -110 was obtained. The obtained X-ray diffraction pattern is shown in Figure 1.
また、ｌｌｏＫ級の超伝導物質の体積分率の大小を比較
するために、Ｔｃ−８０にの物質に特異的に現れる２ｅ
：２３．３±０．２°の回折ピークの強度（図−２に
おけるＬ）に対する前記回折ピーク群を有する物質に特
異的に現れる２ｅ ：２４．０±０．２°の回折ピーク
の強度（図−２におけるＨ）の比率を求めたところ、Ｈ
／Ｌ＝２．７であり、Ｔｃ−１１０にの超伝導物質を大
量に含有すること力’Ｉ７Ｉ：’認された。In addition, in order to compare the volume fractions of lloK-class superconducting materials, 2e, which specifically appears in Tc-80 materials, was
2e: Intensity of the diffraction peak at 24.0±0.2° (L in Figure 2) that appears specifically in the substance having the above diffraction peak group for the intensity of the diffraction peak at 23.3±0.2° (L) When we calculated the ratio of H) in Figure 2, we found that H
/L=2.7, and it was recognized that Tc-110 contained a large amount of superconducting material.
実施例２〜５、比較例１〜６
ビスマス、バナジウム、ストロンチウム、カルシウムお
よび銅の原子比率を表−１に記載したように変更したこ
と以外は実施例１と同様の方法で酸化物超伝導体を製造
し、Ｈ／Ｌを測定した。得られた結果を表−１に示す。Examples 2 to 5, Comparative Examples 1 to 6 Oxide superconductors were produced in the same manner as in Example 1, except that the atomic ratios of bismuth, vanadium, strontium, calcium, and copper were changed as shown in Table 1. was manufactured and H/L was measured. The results obtained are shown in Table-1.
表−１ られる。Table-1 It will be done.
図−１は、実施例１で製造された超伝導体について、Ｃ
ｕＫａ線（１，５４１８Ａンを用いて得られた粉末Ｘ
線回折パターンである。図−１において、（［）印が付
されたピークはＴＣ〜１１０にの相を示し、Δ印が付さ
れたピークはＴＣ〜８０にの相を示し、０印が付された
ピークはＣｕＯを示し、・印が付されたピークはＣａ２
ＣｕＯ３を示す。
図−２は、図−１における回折角（２０）が２３〜２４
°付近の拡大図であり、ＨおよびＬはそれぞれ２ Ｅ３
：２４．０４°および２ （３＝ ２３．２９°の回
折ピークの強度を表わす。
回折強度
図−２
回折角２θ
（度）Figure 1 shows the superconductor manufactured in Example 1 with C
Powder X obtained using uKa radiation (1,5418A)
This is a line diffraction pattern. In Figure 1, the peaks marked ([) indicate the phase of TC~110, the peaks marked Δ indicate the phase of TC~80, and the peaks marked 0 indicate the phase of CuO The peaks marked with ・ are Ca2
Indicates CuO3. In Figure 2, the diffraction angle (20) in Figure 1 is 23 to 24.
This is an enlarged view around °, H and L are each 2 E3
:24.04° and 2 (3 = represents the intensity of the diffraction peak at 23.29°. Diffraction intensity diagram-2 Diffraction angle 2θ (degrees)
Claims (2)
のモル数を表わし、 α＝２．０−β ０．２≦β≦０．８ １．８≦γ≦２．２ １．８≦δ≦２．２(1) Composition formula BiαVβSrγCaδCuεOx (In the formula, α, β, γ, δ, ε and x represent the number of moles of each element, α=2.0−β 0.2≦β≦0.8 1.8 ≦γ≦2.2 1.8≦δ≦2.2
ウム化合物、カルシウム化合物および銅化合物の混合物
を、酸素含有ガス雰囲気下、６８０℃以下の温度で酸化
バナジウムが実質上認められなくなるまで一次焼成した
後、８３０〜８７０℃で二次焼成することを特徴とする
特許請求の範囲第１項記載の酸化物超伝導体の製造法。2.7≦ε≦3.3. ) oxide superconductor. (2) A mixture of a bismuth compound, a vanadium compound, a strontium compound, a calcium compound, and a copper compound is primarily fired in an oxygen-containing gas atmosphere at a temperature of 680°C or lower until vanadium oxide is virtually no longer observed, and then 2. The method for producing an oxide superconductor according to claim 1, wherein the secondary firing is carried out at a temperature of .degree.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63164364A JPH0214826A (en) | 1988-07-01 | 1988-07-01 | Oxide superconductor and production thereof |
| PCT/JP1989/000133 WO1989007579A1 (en) | 1988-02-12 | 1989-02-10 | Superconducting oxide and method of producing the same |
| EP19890902293 EP0359827A4 (en) | 1988-02-12 | 1989-02-10 | Superconducting oxide and method of producing the same |
| KR1019890701879A KR900700394A (en) | 1988-02-12 | 1989-10-12 | Oxide superconductor and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63164364A JPH0214826A (en) | 1988-07-01 | 1988-07-01 | Oxide superconductor and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0214826A true JPH0214826A (en) | 1990-01-18 |
Family
ID=15791741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63164364A Pending JPH0214826A (en) | 1988-02-12 | 1988-07-01 | Oxide superconductor and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0214826A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57124798U (en) * | 1981-01-29 | 1982-08-03 | ||
| JPS59132397A (en) * | 1983-01-18 | 1984-07-30 | 株式会社神戸製鋼所 | Storage container of radioactive material |
| JPS61140999U (en) * | 1985-02-21 | 1986-09-01 |
-
1988
- 1988-07-01 JP JP63164364A patent/JPH0214826A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57124798U (en) * | 1981-01-29 | 1982-08-03 | ||
| JPS59132397A (en) * | 1983-01-18 | 1984-07-30 | 株式会社神戸製鋼所 | Storage container of radioactive material |
| JPS61140999U (en) * | 1985-02-21 | 1986-09-01 |
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