| Project/Area Number |
63420052
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
結晶学
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| Research Institution | Tohoku University |
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Principal Investigator |
KOMATSU Hiroshi Tohoku University, IMR, Professor, 金属材料研究所, 教授 (00108565)
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| Co-Investigator(Kenkyū-buntansha) |
MIYASHITA Satoru Tohoku University, IMR, Assistant, 金属材料研究所, 助手 (00219776)
INOUE Tetsuo Tohoku University, IMR, Assistant, 金属材料研究所, 助手 (60005923)
HAYASHI Shigeyuki Tohoku University, IMR, Assistant Professor, 金属材料研究所, 助教授 (80005868)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥20,600,000 (Direct Cost: ¥20,600,000)
Fiscal Year 1990: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1989: ¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1988: ¥10,200,000 (Direct Cost: ¥10,200,000)
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| Keywords | Oxide High Tc Superconductor / Phase Diagram / Oxidation / Traveling Solvent Method / Flux Growth / Twinning / Single Crystal / Mirror Furnace / 酸化物高温超伝導体 / 単結晶育成 / フラックス成長法 / 包晶反応 / 2223相 / 123相 / Bi系酸化物超伝導体 / 高TcBi系酸化物単結晶 / Bi系酸化物の熱的安定域 / 123相単結晶の高Tc化 / 微分干渉顕微鏡 / 位相差顕微鏡 / 高温超伝導体 / 相変態双晶 / 双晶の観察法 / 臨界温度 / 徐冷法 / 超伝導単結晶 |
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| Research Abstract |
1. Flux growth of high Tc superconductors (123 phase)
(1) Various kinds of 123 single crystals were grown by changing the rare earth elements, such as, Nd, Eu, Gd, Dy, Er, etc. The composition of the flux was varied by changing the composition ratio of CuO and BaO. But this did not bring new results.
(2) The deficiency of oxygen within the 123 single crystals was improved by treating the crystals in a molten CrO_3 salt.
(3) Traveling solvent floating zone method (TSFZ) using a mirror image was employed for growing 123 phase and Bi system crystals. But it was not successful to grow a large single crystal, in stead, they became several single crystals.
2. Liquid phase epitaxial growth of Bi system crystals on Mgo was tried but it was not possible to observe an epitaxial effect.
3. The temperature range of the liquid coexisting with so-called 110K phase of Bi system crystal was directly measured under a microscope, and pseudo-binary phase diagram with the end members Bi_2(SrCa)O_4 and (SrCa)CuO_2 was established.
4. Optical microscopic investigation of as-grown crystals was made using a phase-contrast microscope which is not disturbed by polarization of reflected light from crystals surfaces.
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