JP2634187B2 - Method for producing thallium-based oxide superconductor - Google Patents
Method for producing thallium-based oxide superconductorInfo
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- JP2634187B2 JP2634187B2 JP63091067A JP9106788A JP2634187B2 JP 2634187 B2 JP2634187 B2 JP 2634187B2 JP 63091067 A JP63091067 A JP 63091067A JP 9106788 A JP9106788 A JP 9106788A JP 2634187 B2 JP2634187 B2 JP 2634187B2
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- oxide superconductor
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Classifications
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- 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
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- Compositions Of Oxide Ceramics (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、高臨界温度のタリウム系の酸化物超電導体
の製造方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for producing a thallium-based oxide superconductor at a high critical temperature.
「従来の技術」 近年、常電導状態から超電導状態に遷移する臨界温度
（Tc）が液体窒素温度を超える値を示す酸化物系の超電
導体が種々発見されている。この種の酸化物超電導体
は、Ｙ−Ba−Cu−Ｏ系あるいはBi−Sr−Ca−Cu−Ｏ系な
どで代表される酸化物であって、Ｙ−Ba−Cu−Ｏ系の酸
化物では90Kを超える臨界温度を示し、Bi−Sr−Ca−Cu
−Ｏ系の酸化物では100Kを超える臨界温度を示すことが
確認されている。[Background Art] In recent years, various oxide-based superconductors have been discovered in which a critical temperature (Tc) at which a transition from a normal conducting state to a superconducting state exceeds a liquid nitrogen temperature. This type of oxide superconductor is an oxide represented by a Y-Ba-Cu-O system or a Bi-Sr-Ca-Cu-O system, and is a Y-Ba-Cu-O system oxide. Shows a critical temperature exceeding 90K, Bi-Sr-Ca-Cu
It has been confirmed that a -O-based oxide exhibits a critical temperature exceeding 100K.
「発明が解決しようとする課題」 ところで、最近に至り、アメリカ合衆国、アーカンソ
ー大学のA.M.Hermannらが120K近傍から電気抵抗が低下
し、100K近傍で零抵抗を示すTl−Ca−Ba−Cu−Ｏ系の酸
化物超電導体を発見したことが明らかとなり、その結果
を基に世界中の各研究機関で追試実験が進められてい
る。[Problems to be Solved by the Invention] By the way, recently, the United States, AMHermann et al. Of the University of Arkansas reduced the electric resistance from around 120K and showed a zero resistance near 100K. It became clear that they had discovered an oxide superconductor, and based on the results, research laboratories around the world are conducting additional tests.
この系の酸化物超電導体は、Hermannらが、NATURE VO
L.332 10 MARCH 1988などにおいて公表した内容から明
らかなように、 Tl2Ca1.5Ba1Cu3O8.5＋ｘ（Tc＝103K）、 Tl2Ca2Ba1Cu3OX （Tc＝106K）、 Tl2Ca2Ba2Cu3OX （Tc＝102K）、 なる組成と臨界温度を示すものである。The oxide superconductor of this system is described by Hermann et al.
L.332 10 MARCH is clear from published by contents in such 1988, Tl 2 Ca 1.5 Ba 1 Cu 3 O 8.5 + x (Tc = 103K), Tl 2 C a2 Ba 1 Cu 3 O X (Tc = 106K), Tl 2 C a2 Ba 2 Cu 3 O X (Tc = 102K), which shows the following composition and critical temperature.
以上のように種々の酸化物超電導体が発見されつつあ
る状況であるが、超電導体はより高い温度で抵抗が零に
なることが好ましいので、前記従来の酸化物超電導体の
臨界温度を向上させる製造方法あるいは手段が種々試み
られている状況である。Although various oxide superconductors are being discovered as described above, it is preferable that the resistance of the superconductor becomes zero at a higher temperature, so that the critical temperature of the conventional oxide superconductor is improved. Various production methods or means are being attempted.
本発明は、前記課題に鑑みてなされたもので、118Kで
抵抗が０になる臨界温度の高いTl−Ba−Ca−Cu−Ｏ系の
酸化物超電導体を提供することを目的とする。The present invention has been made in view of the above problems, and has as its object to provide a Tl-Ba-Ca-Cu-O-based oxide superconductor having a high critical temperature at which the resistance becomes zero at 118K.
「課題を解決するための手段」 本発明は、前記課題を解決するために、Ba2Cu3O5なる
組成の酸化物にタリウム化合物とカルシウム化合物をタ
リウムとカルシウムとバリウムと銅の比率が2:2:2:3の
割合になるように混合して混合物を得、この混合物を圧
密して成形体を得るとともに、この成形体を酸素存在雰
囲気中において870〜890℃で加熱した後に冷却するもの
である。`` Means for solving the problem '' The present invention provides, in order to solve the above-mentioned problems, a ratio of thallium, calcium, barium, and copper to thallium compound and calcium compound in an oxide having a composition of Ba 2 Cu 3 O 5. : 2: 2: 3 to obtain a mixture by mixing, the mixture is compacted to obtain a compact, and the compact is heated at 870 to 890 ° C. in an atmosphere containing oxygen and then cooled. Things.
「作用」 Tl−Ba−Ca−Cu−Ｏ系の酸化物超電導体を構成する各
元素を含有する原料を混合した混合物を圧密し、元素の
拡散反応が良好になされるようにした状態において870
〜890℃で熱処理することにより118Kの臨界温度を示す
酸化物超電導体が生成する。"Action" 870 in a state where a mixture of raw materials containing the respective elements constituting the Tl-Ba-Ca-Cu-O-based oxide superconductor is compacted and the diffusion reaction of the elements is favorably performed.
Heat treatment at ~ 890 ° C produces an oxide superconductor exhibiting a critical temperature of 118K.
特に、Ba2Cu3O5なる組成の酸化物にタリウム化合物と
カルシウム化合物をタリウムとカルシウムとバリウムと
銅の比率が2:2:2:3の割合になるように混合した混合物
を用いるので、元素の拡散反応が良好になされて118Kと
いう極めて高い温度で抵抗が０になるタリウム系の酸化
物超電導体が得られる。In particular, since a mixture of a thallium compound and a calcium compound in an oxide having a composition of Ba 2 Cu 3 O 5 such that the ratio of thallium, calcium, barium, and copper is 2: 2: 2: 3 is used, A thallium-based oxide superconductor having a resistance of 0 at an extremely high temperature of 118 K is obtained by a favorable element diffusion reaction.
以下に本発明を更に詳細に説明する。 Hereinafter, the present invention will be described in more detail.
本発明を実施してTl−Ba−Ca−Cu−Ｏ系の酸化物超電
導体を製造するには、まず、出発物を調製する。この出
発物としては、酸化物超電導体の粉末、あるいは、酸化
物超電導体を構成する元素を含む材料、または、これら
の混合物が用いられる。To manufacture the Tl-Ba-Ca-Cu-O-based oxide superconductor by carrying out the present invention, first, a starting material is prepared. As the starting material, a powder of an oxide superconductor, a material containing an element constituting the oxide superconductor, or a mixture thereof is used.
前記材料としては、TlとBaとCaとCuの各化合物あるい
は合金などが用いられる。前記各元素の化合物として
は、酸化物、塩化物、炭酸塩、硫化物、フッ化物などの
粉末あるいは粒状体などが用いられる。また、前記材料
としてCuとBaの複合酸化物などの複合化合物を用いるこ
ともできる。なお、前記化合物として具体的には、Tl2O
3粉末、CaO粉末、BaCo3粉末、Ba2Cu3O5粉末、BaCu3O4粉
末などである。As the material, each compound or alloy of Tl, Ba, Ca, and Cu is used. As the compound of each of the above-mentioned elements, powders or granules of oxides, chlorides, carbonates, sulfides, fluorides and the like are used. In addition, a composite compound such as a composite oxide of Cu and Ba can be used as the material. In addition, specifically, as the compound, Tl 2 O
3 powder, CaO powder, BaCo 3 powder, Ba 2 Cu 3 O 5 powder, BaCu 3 O 4 powder and the like.
前記化合物を用意したならば、TlとBaとCaとCuとＯの
比率が、2:2:23あるいは2:1:2:3になるように各粉末を
混合する。また、前記化合物を前述の比率に混合する場
合、118Kで抵抗が０になる臨界温度の高いタリウム系酸
化物超電導体を得るためには、Baの化合物とCuの化合物
を混合して仮焼処理を施し、BaとCuとＯとからなるBa2C
u3O5なる組成の複合酸化物を作製し、この複合酸化物と
Tlの化合物とCaの化合物を混合することが必要である。
このように得られた混合粉末に炭素などの不要元素が含
有されている場合は、仮焼処理を行って不要成分を除去
しておくことが好ましい。この仮焼条件は、酸素存在雰
囲気、より好ましくは酸素ガス雰囲気中において、500
〜1000℃、更に好ましくは、870〜890℃で0.1〜数10時
間加熱するなどの条件が好ましい。After preparing the compound, the respective powders are mixed such that the ratio of Tl, Ba, Ca, Cu, and O is 2: 2: 23 or 2: 1: 2: 3. When the above compounds are mixed in the above-described ratio, in order to obtain a thallium-based oxide superconductor having a high critical temperature at which the resistance becomes zero at 118 K, a Ba compound and a Cu compound are mixed and calcined. Ba 2 C consisting of Ba, Cu and O
A composite oxide having a composition of u 3 O 5 was prepared, and this composite oxide and
It is necessary to mix the compound of Tl and the compound of Ca.
When the mixed powder thus obtained contains an unnecessary element such as carbon, it is preferable to perform a calcination treatment to remove the unnecessary component. This calcination condition is an oxygen-containing atmosphere, more preferably an oxygen gas atmosphere,
Preferred conditions include heating at 0.1 to 1000 ° C, more preferably 870 to 890 ° C for 0.1 to several tens hours.
ところで前記混合粉末を作製する場合、通常は前述の
粉末法を用いるが、この方法に限定されるものではな
く、各元素をシュウ酸塩などとして共沈させ、その沈澱
物を乾燥させて粉末状の混合粉末を得る共沈法を適用す
ることもできる。また、前記必要元素のアルコキシド化
合物、オキシケトン化合物、シクロペンタジエニル化合
物などを所定の比率で混合して混合液とし、この混合液
を加水分解してゾル化するとともに、このゾル状の物質
を加熱してゲル化し、このゲル状物質を加熱して固相と
した上で粉砕して混合粉末を得るゾルゲル法を適用して
も差し支えない。When the mixed powder is prepared, the above-mentioned powder method is usually used, but the present invention is not limited to this method. Each element is coprecipitated as oxalate and the like, and the precipitate is dried to form a powder. May be applied to obtain a mixed powder of In addition, the alkoxide compound, oxyketone compound, cyclopentadienyl compound, and the like of the necessary elements are mixed at a predetermined ratio to form a mixed solution. The mixed solution is hydrolyzed to form a sol, and the sol-like substance is heated. Then, the sol-gel method of obtaining a mixed powder by heating the gel-like substance to a solid phase and pulverizing the gel-like substance may be applied.
次に以上のように調製された混合粉末に、例えば、0.
1〜10t/cm2程度の圧力を加える圧粉成形処理を施して所
望の形状の圧粉成形体を得る。ここでの圧粉成形には、
例えば、機械プレス、静水圧プレスなどを用いることが
好ましいが、これらの方法に限定されるものではなく、
混合粉末を所望の形状に圧密できる方法であれば、いか
なる方法を用いても良い。従って、例えば、前記混合粉
末を金属管に充填し、ダイス引抜法あるいは冷間鍛造法
などで縮径し、混合粉末を所望の圧密度の圧粉成形体に
する方法などを用いても良い。Next, to the mixed powder prepared as described above, for example, 0.
A compacting process of applying a pressure of about 1 to 10 t / cm 2 is performed to obtain a compact having a desired shape. For the compacting here,
For example, it is preferable to use a mechanical press, an isostatic press, or the like, but is not limited to these methods.
Any method may be used as long as it can compact the mixed powder into a desired shape. Therefore, for example, a method of filling the mixed powder into a metal tube, reducing the diameter by a die drawing method, a cold forging method, or the like to form the mixed powder into a green compact having a desired compact density may be used.
圧粉成形体を得たならば、これを酸素ガス雰囲気中に
おいて870〜890℃で0.1〜10時間程度加熱した後に冷却
する熱処理を施す。ここで加熱温度を前述の範囲外とす
ると臨界温度が低下するので好ましくない。Once the green compact is obtained, it is heated in an oxygen gas atmosphere at 870 to 890 ° C. for about 0.1 to 10 hours and then subjected to a heat treatment of cooling. Here, if the heating temperature is outside the above-mentioned range, the critical temperature decreases, which is not preferable.
以上のような熱処理によって圧粉成形体の内部では固
相反応がなされ、Ba2Cu3O5粉末を用いた場合はTl2Ba1Ca
2Cu3OXなる組成の酸化物超電導物質が、また、Ba1Cu3O4
粉末を用いた場合はTl2Ba2Ca2Cu3OXなる組成の酸化物超
電導物質が各々生成する。なお、Tl2O3粉末とCaO粉末
に、Ba2Cu3O5粉末またはBaCu3O4粉末を混合して混合粉
末を作製した場合は、Tl2O3の融点が717℃、CaOの融点
が2572℃、バリウム銅酸化物の融点が930℃近傍になる
関係から、870〜890℃の温度範囲においては、Tl2O3粉
末が溶融状態となって他の粉末の元素との間に活発な拡
散反応が生じて酸化物超電導体が生成する。By the heat treatment as described above, a solid-phase reaction is performed inside the green compact, and when Ba 2 Cu 3 O 5 powder is used, Tl 2 Ba 1 Ca
Oxide superconducting material 2 Cu 3 O X a composition is also, Ba 1 Cu 3 O 4
When a powder is used, an oxide superconducting material having a composition of Tl 2 Ba 2 Ca 2 Cu 3 O X is generated. Note that Tl 2 O 3 powder and CaO powder, if produced the Ba 2 Cu 3 O 5 powder or BaCu 3 O 4 powder mixed powder by mixing, melting point 717 ° C. of Tl 2 O 3, CaO melting point In the temperature range of 870 to 890 ° C, Tl 2 O 3 powder becomes molten and becomes active with other powder elements in the temperature range of 870 ° C to 2572 ° C and the melting point of barium copper oxide becomes near 930 ° C. Oxide superconductors are generated due to a strong diffusion reaction.
以上説明した方法によれば、870〜890℃の好ましい温
度範囲で酸素ガス雰囲気中において焼結しているため
に、臨界温度の極めて高いTl2Ba2Ca2Cu3OXの組成、ある
いはTl2Ba2Ca1Cu3OXの組成を有する酸化物超電導体を生
成することができる。そして、このように製造された酸
化物超電導体において、Tl2Ba2Ca2Cu3OXの組成のもの
は、Tc＝118K、Tl2Ba1Ca2Cu3OXの組成のものはTc＝112K
の極めて高い臨界温度を示す。According to the method described above, since sintering is performed in an oxygen gas atmosphere at a preferable temperature range of 870 to 890 ° C., the composition of Tl 2 Ba 2 Ca 2 Cu 3 O X having a very high critical temperature, or Tl An oxide superconductor having a composition of 2 Ba 2 Ca 1 Cu 3 O X can be produced. And, in the oxide superconductor thus manufactured, the one having the composition of Tl 2 Ba 2 Ca 2 Cu 3 O X is Tc = 118 K, and the one having the composition of Tl 2 Ba 1 Ca 2 Cu 3 O X is Tc. = 112K
Has a very high critical temperature.
実施例および製造例 Ba:Cu:O＝2:3:5となるようにBaCO3粉末とCuO粉末を混
合し、この混合粉末を酸素ガス雰囲気中において880℃
で12時間加熱する仮焼処理を行った。次にこの仮焼粉末
を粉砕して粒径を揃え、Ba2Cu3O5なる組成の酸化物粉末
を得た。次にこの酸化物粉末とTl2O3粉末とCaO粉末をT
l:Ca:Ba:Cu＝2:2:2:3の比率になるように混合して混合
粉末を得た。Examples and Preparations Example Ba: Cu: O = 2: 3: a mixture of BaCO 3 powder and CuO powder so as to 5, 880 ° C. The mixed powder in an oxygen gas atmosphere
For 12 hours. Next, the calcined powder was pulverized to make the particle diameter uniform, thereby obtaining an oxide powder having a composition of Ba 2 Cu 3 O 5 . Next, this oxide powder, Tl 2 O 3 powder and CaO powder
The mixture was mixed at a ratio of l: Ca: Ba: Cu = 2: 2: 2: 3 to obtain a mixed powder.
この混合粉末を機械プレスで1t/cm2の圧力をかけて圧
粉成形し、厚さ1.5mm、直径13mmのペレット成形体を得
た。This mixed powder was pressed with a mechanical press at a pressure of 1 t / cm 2 to obtain a compact having a thickness of 1.5 mm and a diameter of 13 mm.
続いて前記成形体を酸素ガス雰囲気中において880℃
で１時間加熱した後に200℃／時間の割合で冷却する熱
処理を施してTl2Ba2Ca2Cu3OXなる組成の酸化物超電導体
を得た。Subsequently, the molded body was heated at 880 ° C. in an oxygen gas atmosphere.
After heating for 1 hour at a temperature of 200 ° C./hour, an oxide superconductor having a composition of Tl 2 Ba 2 Ca 2 Cu 3 O X was obtained.
また、前述の工程と同等の工程を行う際に、熱処理温
度を870℃に設定してTl2Ba2Ca2Cu3OXなる組成の酸化物
超電導体を得た。In addition, when performing the same step as the above-mentioned step, the heat treatment temperature was set to 870 ° C. to obtain an oxide superconductor having a composition of Tl 2 Ba 2 Ca 2 Cu 3 O X.
更に、前述の工程と同等の工程を行う場合に、Ba:Ca:
O＝1:3:4の比率になるようにBaCO3粉末とCuO粉末を混合
して混合粉末を調製し、この後仮焼してBa1Cu3O4なる組
成の酸化物粉末を得、成形後に行う熱処理温度を870℃
と880℃に設定して２種類のTl2Ba1Ca2Cu3OXなる組成の
酸化物超電導体を得た。Further, when performing a step equivalent to the above-mentioned step, Ba: Ca:
A mixed powder was prepared by mixing the BaCO 3 powder and the CuO powder so as to have a ratio of O = 1: 3: 4, and then calcined to obtain an oxide powder having a composition of Ba 1 Cu 3 O 4 , 870 ° C heat treatment temperature after molding
And 880 ° C., two types of oxide superconductors having compositions of Tl 2 Ba 1 Ca 2 Cu 3 O X were obtained.
以上得られた酸化物超電導体について温度と抵抗率を
測定した結果を第１表に示す。Table 1 shows the results of measuring the temperature and the resistivity of the oxide superconductor obtained as described above.
第１図において、の曲線は880℃で熱処理を行ったT
l2Ba2Ca2Cu3OXなる組成の酸化物超電導体の特性を示
し、の曲線はTl2Ba2Ca2Cu3OXなる組成で870℃で熱処
理を行った酸化物超電導体の特性を示し、の曲線は88
0℃で熱処理を行ったTl2Ba1Ca2Cu3OXなる組成の酸化物
超電導体の特性を示し、の曲線は870℃で熱処理を行
ったTl2Ba1Ca2Cu3OXなる組成の酸化物超電導体の特性を
示す。In FIG. 1, the curve of T indicates that the heat treatment was performed at 880 ° C.
The characteristics of the oxide superconductor having the composition l 2 Ba 2 Ca 2 Cu 3 O X are shown, and the curve of the oxide superconductor which was heat-treated at 870 ° C. with the composition Tl 2 Ba 2 Ca 2 Cu 3 O X Characteristic, the curve is 88
The characteristics of the oxide superconductor having the composition of Tl 2 Ba 1 Ca 2 Cu 3 O X heat-treated at 0 ° C. are shown, and the curve of Tl 2 Ba 1 Ca 2 Cu 3 O X heat-treated at 870 ° C. The characteristics of the oxide superconductor having the composition are shown.
第１図から明らかなように、の曲線で示される酸化
物超電導体においては、Tc＝118Kを実現することができ
た。また、で示される酸化物超電導体においては、Tc
＝112Kを実現することができた。As is clear from FIG. 1, in the oxide superconductor represented by the curve, it was possible to realize Tc = 118K. Further, in the oxide superconductor represented by
= 112K was realized.
また、第２図は、第１図に，，，の曲線で示
した酸化物超電導体の各々の磁化率と温度の関係を示し
たものである。FIG. 2 shows the relationship between the susceptibility and the temperature of each of the oxide superconductors shown by the curves of FIG.
第２図から明らかなようにの曲線で示される酸化物
超電導体が120K近傍で磁化率の急峻な変化を示してお
り、120K近傍で酸化物超電導物質が生成していることが
判明した。また、の曲線で示される酸化物超電導体は
120K近傍と112K近傍で磁化率の２段階の急峻な変化を示
していることが判明した。第１図と第２図に示す結果か
ら、Tl2Ba2Ca2Cu3OXで示される組成と、Tl2Ba1Ca2Cu3OX
で示される組成のいずれの場合も880℃で焼結すること
がより好ましいことが判明した。The oxide superconductor indicated by the curve clearly shown in FIG. 2 shows a sharp change in magnetic susceptibility near 120 K, and it was found that an oxide superconductor was generated near 120 K. The oxide superconductor represented by the curve of
It was found that the magnetic susceptibility showed a two-step steep change near 120 K and near 112 K. From the results shown in FIGS. 1 and 2, the composition represented by Tl 2 Ba 2 Ca 2 Cu 3 O X and the composition represented by Tl 2 Ba 1 Ca 2 Cu 3 O X
It has been found that sintering at 880 ° C. is more preferable in any of the compositions shown by
なお、比較のために、前述の工程において最終の熱処
理工程を大気中において行ってみたが、880℃と870℃で
行う熱処理では、得られた酸化物は超電導特性を示さな
かった。Note that, for comparison, the final heat treatment step in the above-described step was performed in air, but the heat treatment performed at 880 ° C. and 870 ° C. did not show superconductivity in the obtained oxide.
「発明の効果」 以上説明したように本発明によれば、Ba2Cu3O5なる組
成の酸化物にタリウム化合物とカルシウム化合物をタリ
ウムとカルシウムとバリウムと銅の比率が2:2:2:3の割
合になるように混合した混合物を圧密し、元素の拡散反
応が良好になされるようにした状態において、870〜890
℃の好ましい温度範囲で熱処理するために、118Kの臨界
温度を示し、118Kで抵抗が０になるタリウム系の酸化物
超電導体を生成できる効果がある。`` Effects of the Invention '' As described above, according to the present invention, an oxide having a composition of Ba 2 Cu 3 O 5 has a thallium compound and a calcium compound in a ratio of thallium, calcium, barium, and copper of 2: 2: 2: In a state in which the mixture mixed so as to have a ratio of 3 is compacted so that the diffusion reaction of the elements can be favorably performed, 870 to 890
Since the heat treatment is performed in a preferable temperature range of ° C., a thallium-based oxide superconductor having a critical temperature of 118 K and having zero resistance at 118 K is produced.
また、Ba2Cu3O5なる組成の酸化物にタリウム化合物と
カルシウム化合物をタリウムとカルシウムとバリウムと
銅の比率が2:2:2:3の割合になるように混合して混合物
を得、これを基にして製造するので、混合された各元素
が効率よく反応する結果、従来の酸化物超電導体では得
られなかった118Kという高い温度で抵抗０になる優れた
臨界温度を示すタリウム系酸化物超電導体を製造でき
る。Also, an oxide having a composition of Ba 2 Cu 3 O 5 was mixed with a thallium compound and a calcium compound such that the ratio of thallium, calcium, barium, and copper was 2: 2: 2: 3 to obtain a mixture, Since it is manufactured on the basis of this, as a result of the mixed elements reacting efficiently, thallium-based oxides exhibiting an excellent critical temperature at which the resistance becomes zero at a high temperature of 118 K, which cannot be obtained with conventional oxide superconductors. Superconductor can be manufactured.
第１図は本発明例と比較例の温度と抵抗率の関係を示す
線図、第２図は本発明例と比較例の磁化率と温度の関係
を示す線図である。FIG. 1 is a diagram showing the relationship between the temperature and the resistivity of the example of the present invention and the comparative example, and FIG. 2 is a diagram showing the relationship between the magnetic susceptibility and the temperature of the example of the present invention and the comparative example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 宰 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (72)発明者 小山内 裕 東京都江東区木場１丁目５番１号 藤倉 電線株式会社内 (56)参考文献 特開 平１−261230（ＪＰ，Ａ) 特開 平１−242418（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Kono 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (72) Inventor Hiroshi Koyamauchi 1-1-5-1 Kiba, Koto-ku, Tokyo Fujikura Electric Wire (56) References JP-A 1-261230 (JP, A) JP-A 1-242418 (JP, A)
Claims (1)
物とカルシウム化合物をタリウムとカルシウムとバリウ
ムと銅の比率が2:2:2:3の割合になるように混合して混
合物を得、この混合物を圧密して成形体を得るととも
に、この成形体を酸素存在雰囲気中において870〜890℃
で加熱した後に冷却することを特徴とするタリウム系酸
化物超電導体の製造方法。1. A mixture obtained by mixing a thallium compound and a calcium compound with an oxide having a composition of Ba 2 Cu 3 O 5 such that the ratio of thallium, calcium, barium and copper is 2: 2: 2: 3. The mixture is compacted to obtain a molded body, and the molded body is heated at 870 to 890 ° C. in an atmosphere containing oxygen.
A method for producing a thallium-based oxide superconductor, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63091067A JP2634187B2 (en) | 1988-04-13 | 1988-04-13 | Method for producing thallium-based oxide superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63091067A JP2634187B2 (en) | 1988-04-13 | 1988-04-13 | Method for producing thallium-based oxide superconductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01264953A JPH01264953A (en) | 1989-10-23 |
| JP2634187B2 true JP2634187B2 (en) | 1997-07-23 |
Family
ID=14016154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63091067A Expired - Fee Related JP2634187B2 (en) | 1988-04-13 | 1988-04-13 | Method for producing thallium-based oxide superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2634187B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01305816A (en) * | 1988-06-01 | 1989-12-11 | Agency Of Ind Science & Technol | High-temperature superconductor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4962083A (en) * | 1988-02-12 | 1990-10-09 | University Of Arkansas | High temperature T1-Ba-Ca-Cu-O and T1-Sr-Cu-O superconductor |
| JP3034255B2 (en) * | 1988-04-09 | 2000-04-17 | 株式会社東芝 | Superconductor, superconductor wire, and method of manufacturing superconducting wire |
-
1988
- 1988-04-13 JP JP63091067A patent/JP2634187B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01264953A (en) | 1989-10-23 |
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