JPH01278466A - Production of superconductor - Google Patents
Production of superconductorInfo
- Publication number
- JPH01278466A JPH01278466A JP63106695A JP10669588A JPH01278466A JP H01278466 A JPH01278466 A JP H01278466A JP 63106695 A JP63106695 A JP 63106695A JP 10669588 A JP10669588 A JP 10669588A JP H01278466 A JPH01278466 A JP H01278466A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- temperature
- mixed powder
- superconductor
- mixing
- 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 12
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000011575 calcium Substances 0.000 claims abstract description 20
- 239000010949 copper Substances 0.000 claims abstract description 18
- 239000011812 mixed powder Substances 0.000 claims abstract description 11
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 6
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000001590 oxidative effect Effects 0.000 claims abstract description 6
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 5
- 229940043430 calcium compound Drugs 0.000 claims abstract description 5
- 150000001674 calcium compounds Chemical class 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 238000010298 pulverizing process Methods 0.000 claims abstract description 3
- 238000010304 firing Methods 0.000 claims description 11
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 4
- 150000003438 strontium compounds Chemical class 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910014454 Ca-Cu Inorganic materials 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 22
- 239000007788 liquid Substances 0.000 abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000001354 calcination Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract 3
- 150000001875 compounds Chemical class 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- 239000005751 Copper oxide Substances 0.000 description 4
- 229910000431 copper oxide Inorganic materials 0.000 description 4
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229910000018 strontium carbonate Inorganic materials 0.000 description 2
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- UUCCCPNEFXQJEL-UHFFFAOYSA-L strontium dihydroxide Chemical compound [OH-].[OH-].[Sr+2] UUCCCPNEFXQJEL-UHFFFAOYSA-L 0.000 description 1
- 229910001866 strontium hydroxide Inorganic materials 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 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】
Ａ、産業上の利用分野
本発明は、一定の温度で電気抵抗がゼロになるいわゆる
超電導体に係り、特に液体窒素温度以上で超電導特性を
示す超電導体の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION A. Industrial Application Field The present invention relates to a so-called superconductor whose electrical resistance becomes zero at a certain temperature, and particularly relates to a method for producing a superconductor that exhibits superconducting properties at temperatures above liquid nitrogen temperature. .
Ｂ９発明の概要
本発明は、ビスマス酸化物の粉末、カルシウム化合物の
粉末、銅酸化物の粉末を混合して仮焼成すると共にこれ
を粉砕して加工粉末を得、これにストロンチウム化合物
の粉末を加えて混合し、これを加圧成形した後に酸化性
雰囲気中で本焼成して得た、
ビスマス（Ｂｉ）、ストロンチウム（Ｓｒ）、カルシウ
ム（Ｃａ）、銅（Ｃｕ）、及び酸素（Ｏ）の成分からな
る焼結体で、液体窒素温度以上（絶対温度７７℃）以上
で超電導を示す超電導体の製造方法にある。B9 Summary of the Invention The present invention involves mixing bismuth oxide powder, calcium compound powder, and copper oxide powder, calcining the mixture, and pulverizing the mixture to obtain a processed powder, to which powder of a strontium compound is added. Components of bismuth (Bi), strontium (Sr), calcium (Ca), copper (Cu), and oxygen (O) obtained by mixing the mixture under pressure, molding it under pressure, and then firing it in an oxidizing atmosphere. A method for producing a superconductor which exhibits superconductivity at a temperature higher than liquid nitrogen temperature (absolute temperature 77°C) and higher.
Ｃ１従来の技術
１９１１年にカメリング・オンネスにより超電導現象が
発見されて以来、実用化に向けてさまざまな研究開発が
進められている。実用化には、臨界温度（Ｔｃ）が高け
れば高い程、冷却コストが安くて済むため、より高温で
の超電導の可能性をめぐってその超電導材料の激しい開
発競争が展開されている。C1 Conventional Technology Since the discovery of superconductivity by Kamerling Onnes in 1911, various research and development efforts have been made toward practical application. For practical application, the higher the critical temperature (Tc), the lower the cooling cost, so there is intense competition to develop superconducting materials with the potential for superconducting at higher temperatures.
最近、液体窒素の温度７７に以上の温度にて超電導現象
を生じるものとして、ストロンチウム・イッテルビウム
・銅酸化物・イツトリウム系銅酸化物といった超電導材
料が発見されたと発表されるに至っている。Recently, it has been announced that superconducting materials such as strontium, ytterbium, copper oxide, and yttrium-based copper oxide have been discovered as materials that exhibit superconducting phenomena at temperatures above the temperature of liquid nitrogen of 77°C.
Ｄ３発明が解決しようとする課題
液体窒素の温度以上の温度で超電導現象を生じることか
ら、この超電導を利用した具体的な適用範囲が拡大して
きた。D3 Problems to be Solved by the Invention Since superconductivity occurs at temperatures higher than the temperature of liquid nitrogen, the range of specific applications utilizing this superconductivity has expanded.
しかし、上述のようなイツトリウムは希少材料であるこ
とから、高価であり、超電導の適用範囲の拡大にはおの
ずと限界があり、安価な超電導材料の開発が望まれてい
るが、その開発は、まだ緒についたばかりであるのが現
状である。However, since yttrium is a rare material as mentioned above, it is expensive, and there is a natural limit to the expansion of the application range of superconductivity.Therefore, there is a desire to develop inexpensive superconducting materials, but the development has not yet been completed. The current situation is that it has just started.
これらの点に鑑み、本発明は、安価な材料にて７７にで
超電導状態となる超電導体の製造方法を提供しようとす
るしのである。In view of these points, the present invention seeks to provide a method for manufacturing a superconductor that becomes superconducting at 77 using inexpensive materials.
Ｅ０課題を解決するための手段と作用
発明台らは、種々の材料の配合、焼成温度等の実験を重
ねた結果、ビスマス（Ｂｉ）、ストロンチウム（Ｓｒ）
、カルシウム（Ｃａ）、銅（Ｃｕ）、及び酸素（Ｏ）の
成分からなる焼結体で、ビスマス酸化物、カルシウム化
合物、銅酸化物の粉末を混合し、この混合粉末を本焼成
の温度より低い温度にて仮焼成すると共にこれを粉砕し
て加工粉末を得、これにストロンチウム化合物の粉末を
加えて混合し、これを加圧成形した後に酸化性雰囲気中
で且つ８３０〜８８０℃の範囲の温度で本焼成して焼結
体とすることにより、Ｂｉ−Ｓｒ−Ｃａ−Ｃｕ−０の成
分からなり、且つ旧、Ｓｒ、Ｃａ。Means and effects for solving the E0 problem As a result of repeated experiments on the composition of various materials, firing temperatures, etc., the inventors discovered bismuth (Bi), strontium (Sr), etc.
, calcium (Ca), copper (Cu), and oxygen (O), in which powders of bismuth oxide, calcium compound, and copper oxide are mixed, and this mixed powder is heated at a temperature higher than the main firing temperature. Temporarily calcined at a low temperature and pulverized to obtain a processed powder, strontium compound powder is added and mixed, this is pressure molded, and then heated in an oxidizing atmosphere at a temperature of 830 to 880°C. By performing main firing at this temperature to form a sintered body, it consists of the components Bi-Sr-Ca-Cu-0, and contains old, Sr, and Ca.
Ｃｕの成分の原子比が、
Ｓ ｒ ： Ｃａ＝ １ ＋ ０．３〜３Ｉ３ ｉ ：
Ｃｕ＝ Ｉ ： １．８〜４（Ｓｒ＋Ｃａ）： （Ｂ
ｉ＋Ｃｕ）＝１ ： Ｉ〜２の範囲であれば、液体窒素
温度の冷却で抵抗ゼロのち密でしかも特性の安定した超
電導体が得られることを見いだした。The atomic ratio of the Cu components is Sr:Ca=1+0.3~3I3i:
Cu=I: 1.8~4(Sr+Ca): (B
i+Cu)=1: It has been found that in the range of I to 2, a dense superconductor with zero resistance and stable characteristics can be obtained by cooling to liquid nitrogen temperature.
なお、ストロンチウム化合物としては、ストロンチウム
炭酸化物（ＳｒＣＣ＋＋）、ストロンチウム酸化物（Ｓ
ｒＯ）、
ストロンチウム水酸化物（Ｓ ｒ （ＯＨ） ｚ）、の
何れか一種以上を用いる。Note that strontium compounds include strontium carbonate (SrCC++), strontium oxide (SrCC++), and strontium oxide (SrCC++).
rO) and strontium hydroxide (S r (OH) z).
また、カルシウム化合物としては、
カルシウム炭酸化物（Ｃａ ＣＯａ ）、カルシウム酸
化物（Ｃａｂ）、
カルシウム水酸化物（Ｃａ（Ｏ１−１）ｙ）、の何れが
一種以上を用いる。Further, as the calcium compound, one or more of calcium carbonate (CaCOa), calcium oxide (Cab), and calcium hydroxide (Ca(O1-1)y) is used.
なお、各成分の原子比及び温度が、前記の範囲外の場合
には、液体窒素で超電導が生じる焼結体を得ることがで
きなかった。Note that when the atomic ratio and temperature of each component were outside the above ranges, it was not possible to obtain a sintered body in which superconductivity occurred in liquid nitrogen.
Ｆ、実施例 以下、本発明を実施例に基づいて説明する。F. Example Hereinafter, the present invention will be explained based on examples.
先ず、出発原料として粒径１０８ｍ以下のビスマス酸化
物（ＢｉｘＯ３）の粉末、ストロンチウム炭酸化物（Ｓ
ｒＣＯａ）の粉末、カルシウム炭酸化物（Ｃａ ＣＯ３
）の粉末、銅酸化物（Ｃｕｂ）の粉末を各々Ｉ１．１ｍ
ｏ１％、２２．２ｍｏ１％。First, as starting materials, bismuth oxide (BixO3) powder with a particle size of 108 m or less, strontium carbonate (S
rCOa) powder, calcium carbonate (Ca CO3
) powder and copper oxide (Cub) powder at I1.1m each.
o1%, 22.2mo1%.
２２．２ｍｏ１％、４４．４ｍｏ１％となるように秤量
する。Weigh out 22.2 mo1% and 44.4 mo1%.
次に、Ｉ’３ｉｔＯ＊、Ｃａ ＣＯｓ、ＣｕＯの粉末を
ボールミルで、アルコール（又は原料粉末と反応しない
溶媒）と玉石を入れ数時間充分に混合し、得られたスラ
リーを約１００℃の温度で乾燥する。Next, the powders of I'3itO*, Ca COs, and CuO were thoroughly mixed in a ball mill with alcohol (or a solvent that does not react with the raw material powder) and cobblestones for several hours, and the resulting slurry was heated at a temperature of about 100°C. dry.
次に乾燥して得た混合粉末をアルミナ容器に入れ、酸化
性雰囲気中にて後工程の本焼成の温度より低い温度（約
８４０℃）で約４時間加熱処理（いわゆる仮焼成）する
。Next, the mixed powder obtained by drying is placed in an alumina container and heat-treated (so-called preliminary firing) for about 4 hours in an oxidizing atmosphere at a temperature (about 840° C.) lower than the temperature of the main firing in the subsequent step.
次に得られた焼成粉を充分に粉砕し微細化した加工粉を
得る。Next, the obtained fired powder is sufficiently ground to obtain a fine processed powder.
次に、この加工粉末と、ＳｒＣＯ，ｓの粉末とをボール
ミルで、アルコール（又は原料粉末と反応しない溶媒）
と玉石をいれ数時間充分に混合し、得られたスラリーを
約１００℃の温度で乾燥する。Next, this processed powder and SrCO,s powder were mixed in a ball mill using alcohol (or a solvent that does not react with the raw material powder).
and cobblestones and thoroughly mixed for several hours, and the resulting slurry is dried at a temperature of about 100°C.
そして、バインダーとしてポリビニルアルコールを、原
料粉末に対して１重量％となるようにポリビニルアルコ
ール溶液の形で添加する。Then, polyvinyl alcohol is added as a binder in the form of a polyvinyl alcohol solution to 1% by weight based on the raw material powder.
そしてアルコールを更に加え充分に混練した後、乾燥し
、ふるいにて１５０メツシユ以下の顆粒状の造粒粉を得
る。After further adding alcohol and thoroughly kneading, the mixture is dried and sieved to obtain granulated powder having a size of 150 mesh or less.
次に、この造粒粉を金型に充填した後、１〜２Ｔ ｏ
ｎ ／ ｃ ｍ ”程度の圧力で圧縮成形して、外径４
０ｍｍ、厚み約６ｍｍの成形体を作る。Next, after filling this granulated powder into a mold, 1~2T o
Compression molded at a pressure of about n/cm" to an outer diameter of 4
A molded body with a diameter of 0 mm and a thickness of approximately 6 mm is made.
次に、この成形体を焼成容器内に設置し、酸化性雰囲気
で、前工程の熱処理温度の約８４０℃より高い温度で且
つ約８８０℃より低い温度（８４０〜８８０℃）で数時
間加熱して焼結体（セラミックス）を得る。Next, this molded body is placed in a firing container and heated in an oxidizing atmosphere at a temperature higher than the heat treatment temperature of the previous step of about 840°C and lower than about 880°C (840 to 880°C) for several hours. to obtain a sintered body (ceramics).
上記の製造方法により得られた焼結体を、幅４ｍｍ、厚
さ４ｍｍ、長さ４０ｍｍの形状に切り出して第１図に示
すように電極を設けて４端子法により、焼結体の抵抗を
測定した。The sintered body obtained by the above manufacturing method was cut into a shape with a width of 4 mm, a thickness of 4 mm, and a length of 40 mm. Electrodes were provided as shown in Figure 1, and the resistance of the sintered body was determined by the four-terminal method. It was measured.
即ち第１図は抵抗値を測定するための説明図で、焼結体
Ｓの長方向の両端側に電流を流すための端子ａ、ａ′を
設け、その内側に抵抗値を測定するための電圧端子す、
ｂ’を設け、これを液体窒素の低温槽に入れ、端子ａ、
ａ′に１アンペアの安定化電流を流して端子ｂ’、ｂ’
間の電圧を電圧計（Ｖ）で測定して端子す、ｂ′間の電
圧降下によって抵抗値を測定する。なお、Ａは電流計を
示す。That is, Fig. 1 is an explanatory diagram for measuring the resistance value. Terminals a and a' for flowing current are provided on both ends of the sintered body S in the longitudinal direction. Voltage terminal
b', put it in a liquid nitrogen cryostat, and connect terminals a,
A stabilized current of 1 ampere is applied to terminals b' and b'.
The voltage between terminals A and B' is measured with a voltmeter (V), and the resistance value is determined by the voltage drop between terminals A and B'. Note that A indicates an ammeter.
第２図は、その測定結果を示すもので、絶対温度約１１
０にで超電導現象か始まり約８５Ｋに至って電気抵抗が
ゼロになることが確認された。Figure 2 shows the measurement results, with an absolute temperature of approximately 11
It was confirmed that the superconducting phenomenon begins at 0, and the electrical resistance becomes zero when the temperature reaches about 85K.
他の組成比についても同様な実験を行ったので、面性の
例も含めて記載する。Similar experiments were conducted for other composition ratios, so examples of surface properties will also be described.
（以下余白）
（混合時の吊を原子比に換算したｔ、の）但し、表の実
施例２が上述したものを示す。(Hereinafter, blank space) (t, which is obtained by converting the suspension at the time of mixing into an atomic ratio) However, Example 2 in the table shows the above.
なお、上記の表の結果からｒ３ｉＳＳｒＳＣａｓＣｕの
成分原子比の関係が、
同じアルカリ土類であるＳｒ、Ｃａの関係は、Ｓ ｒ
： Ｃａ＝ ｌ ： ０．３〜３他のＢｉ、Ｃｕの関係
は、
１３ ｉ ： Ｃｕ＝ ｌ ： １．８〜４そしてこれ
ら両前の関係は、
（Ｓｒ＋Ｃａ）： （Ｂｉ＋Ｃｕ）＝１ ： １〜２の
範囲の場合には、液体窒素で超電導現象（抵抗ゼロ又は
微小値）か生じる焼結体を得ることができた。Furthermore, from the results in the table above, the relationship between the component atomic ratios of r3iSSrSCasCu is as follows: The relationship between Sr and Ca, which are the same alkaline earths, is S r
: Ca= l : 0.3~3 The other relationship between Bi and Cu is 13 i : Cu= l : 1.8~4 and the relationship between these two is (Sr+Ca): (Bi+Cu)=1:1 In the range of ~2, it was possible to obtain a sintered body in which a superconducting phenomenon (resistance of zero or minute value) occurred in liquid nitrogen.
しかし、温度が８３０℃未満、８８０℃超過では所望の
超電導現象が生じる焼結体を得ろことができなかった。However, if the temperature is lower than 830°C or higher than 880°C, it was not possible to obtain a sintered body in which the desired superconducting phenomenon occurred.
Ｇ１発明の効果
以上のように本発明による超電導体は、液体窒素温度（
７７Ｋ）において完全に超電導状態となる。G1 Effects of the Invention As described above, the superconductor according to the present invention has a temperature of liquid nitrogen (
It becomes completely superconducting at 77K).
しかも、従来のイツトリウムを用いたものは、Ｔｃが９
０に程度であったが、本発明のものにあっては、約１０
５にであり、より高温度で超電導現象を生じることから
安定した超電導状態を維持できるものである。Moreover, the conventional one using yttrium has a Tc of 9
However, in the case of the present invention, it was about 10
5, and since the superconducting phenomenon occurs at higher temperatures, a stable superconducting state can be maintained.
その上、原料粉末を予め本焼成温度以下の温度で加熱す
ることにより本焼成時の反応がゆるやかになり、品質の
安定した超電導体を得ることができる。Moreover, by heating the raw material powder in advance at a temperature below the main firing temperature, the reaction during the main firing becomes gradual, and a superconductor with stable quality can be obtained.
しかも安価な原材料にて超電導体を形成でき、その上液
体窒素温度での冷却でよいことから、−層実用化に近す
き、特に電ツバ運輸等に関連した電気抵抗、及び精密計
器素子、その他エネルギー交換などの分野にｆｌＩ用可
能となる等極めて優れた効果を発揮する。In addition, since superconductors can be formed using inexpensive raw materials and only need to be cooled at liquid nitrogen temperatures, they are close to practical application, especially for electrical resistance related to electric rail transportation, precision instrument elements, etc. It exhibits extremely excellent effects, such as making it possible to use flI in fields such as energy exchange.
第１図は本発明の焼結体の抵抗値測定の方法を説明する
ための説明図、第２図は本発明の焼結体の絶対温度（Ｋ
）に対する抵抗値（ｍ０ｃｍ）の特性曲線図を示す。
１、ａ′・・・電流供給用端子、ｂ、ｂ’ ・・・電圧
測定端子、Ｓ・・・焼結体。
第１図
抵抗値の測定方法
第２図
絶対温度（Ｋ）□Figure 1 is an explanatory diagram for explaining the method of measuring the resistance value of the sintered body of the present invention, and Figure 2 is the absolute temperature (K) of the sintered body of the present invention.
) is a characteristic curve diagram of the resistance value (m0cm). 1, a'... Current supply terminal, b, b'... Voltage measurement terminal, S... Sintered body. Figure 1 How to measure resistance Figure 2 Absolute temperature (K) □
Claims (1)
末と、銅酸化物の粉末とを混合して混合粉末を得、該混
合粉末を本焼成の温度より低い温度にて仮焼成し、該仮
焼成物を粉砕して加工粉末を得る工程と、 該加工粉末と、ストロンチウム化合物の粉末とを混合し
て混合粉末を得、該混合粉を加圧して成形体を得る工程
と、 該成形体を酸化性雰囲気中で且つ８３０〜８８０℃の範
囲の温度で本焼成して焼結体を得る工程とからなり、 焼結体がビスマス（Ｂｉ）、ストロンチウム（Ｓｒ）、
カルシウム（Ｃａ）、銅（Ｃｕ）、及び酸素（Ｏ）の成
分からなり、且つＢｉ−Ｓｒ−Ｃａ−Ｃｕにおける成分
の原子比が、 Ｓｒ：Ｃａ＝１：０．３〜３ Ｂｉ：Ｃｕ：１：１．８〜４ （Ｓｒ＋Ｃａ）：（Ｂｉ＋Ｃｕ）＝１：１〜２であるこ
とを特徴とした超電導体の製造方法。(1) Bismuth oxide powder, calcium compound powder, and copper oxide powder are mixed to obtain a mixed powder, and the mixed powder is pre-calcined at a temperature lower than the main firing temperature. A step of pulverizing the fired product to obtain a processed powder; A step of mixing the processed powder and a strontium compound powder to obtain a mixed powder; and a step of pressurizing the mixed powder to obtain a molded body; The process consists of a step of main firing in an oxidizing atmosphere at a temperature in the range of 830 to 880°C to obtain a sintered body, and the sintered body contains bismuth (Bi), strontium (Sr),
It consists of calcium (Ca), copper (Cu), and oxygen (O), and the atomic ratio of the components in Bi-Sr-Ca-Cu is Sr:Ca=1:0.3-3 Bi:Cu: 1:1.8-4 (Sr+Ca):(Bi+Cu)=1:1-2 A method for producing a superconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63106695A JPH01278466A (en) | 1988-04-28 | 1988-04-28 | Production of superconductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63106695A JPH01278466A (en) | 1988-04-28 | 1988-04-28 | Production of superconductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01278466A true JPH01278466A (en) | 1989-11-08 |
Family
ID=14440167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63106695A Pending JPH01278466A (en) | 1988-04-28 | 1988-04-28 | Production of superconductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01278466A (en) |
-
1988
- 1988-04-28 JP JP63106695A patent/JPH01278466A/en active Pending
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