NDLI: Bi-Sr-Ca-Cu-O系超伝導体の熱処理による物性変化

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Bi-Sr-Ca-Cu-O系超伝導体の熱処理による物性変化

Content Provider	Semantic Scholar
Author	祓彦, 荒井和正, 井野美一, 西原
Copyright Year	1995
Abstract	The superconductivlty aRd the crystal structure were invest呈gated iR the Bi-Sr°Ca-Cu-O system with the following chemical compositions of Bi:Sr:Ca:Cu=2:2:1:2,4: 3:3:4=a登d2:2:2:3. It was foun(圭in the chemical compositio鷺of 2-2-1-2 that the single phase of B至2Sr2 Ca Cu20Y with the superco鍛ducting transition temperat殺re, Tc of 80K was obtaiRed o無the sintering conditio簸of 860°Ca鍛d 16 hours. It was determi鍛ed that the むむむ 1a毛tice parame宅ers areα・5.417A,ろ・5。417A and c=30.872A and the period of the incommensurate in the d三rec宅ion of the b-axis is 4.77. On the other hand, the multiphase mixtures was obtaine(i i登other chemical compositions, a1出。競gh the main phase is Bi2Sr2CaCu20y。 For varlous chemical compositions and slntering conditio捻s,宅he magni£ude of the a-and b -axis of Bi2Sr2CaCu20y were almost constant but that of the c-axis extremely varled and was the至owest for the h至ghest value of Tc. The corre圭at呈on between the magnitude ofアh and that of the c-axis is very simllar to that in YBa2Cu307-y. This suggests that the oxyge勲 content p至ays a role on the magnitude ofコ臣and that of the c-axis also in B圭2Sr2CaCu20y. 1.まえがき La-Ba-Cu-O系が,高温超伝導体であることが示されて以来1),より高い超伝導転移温度Tc を持つ超伝導;体の探索が各方面で精力的に進められてきた。その結果,液体窒素温度(77.3K)を越えるTcを持つY-Ba-Cu-O系の発見2)に引き続き,Bi-Sr-Ca-Cu-O系3), Tl-Ba-CaCu-0系4}において高温化が國られた。しかしながら,超伝導の発現機構は未だ明らかになっておらず,超伝導材料としての設計,特性制御の点からもその解明が強く望まれている。超伝導発現機構の手がかりとなる基礎物性を明らかにしていくことは,超伝導研究の大きな役割の一つである6 このような観点から,我々は,T・ :80Kおよび2110Kと異った2つのTcを持ち,80K相は非整合構造5)を持つ興味深い超伝導体であるBi一一Sr-Ca-Cu-O系に注目し,焼結条件を変えた場合の超伝導特性および構造の変化の様子を明らかにした。さらに80Kl単一相を得る最適焼結条件北海道電力株式会祉総合研究所源:子工学科量子計測工学講座
Starting Page	109
Ending Page	127
Page Count	19
File Format	PDF HTM / HTML
Volume Number	34
Alternate Webpage(s)	https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/42161/1/144_49-56.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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