Study on the Interrelation Between Crystal Growth, Phase Transition and Properties of High Tc Superconductors.

高温超导体晶体生长、相变与性能相互关系的研究。

• 批准号: 63420052
• 负责人: KOMATSU Hiroshi
• 金额: $ 13.18万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63420052/
• 关键词: 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 /

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.

1. (1)通过改变稀土元素，如Nd、Eu、Gd、Dy、Er等，生长出了多种123单晶。通过改变CuO和BaO的组成比，可以改变助熔剂的组成。但这并没有带来新的结果。(2)用熔融CrO_3盐处理123单晶，改善了123单晶内部缺氧的状况。(3)采用镜面流动溶剂浮区法（TSFZ）生长123相和Bi系晶体。但是没有成功地长出一个大的单晶，相反，它们变成了几个单晶。尝试了Bi系晶体在Mgo上的液相外延生长，但无法观察到外延效应。3 .在显微镜下直接测量了与Bi体系晶体110K相共存的液相温度范围，并建立了端元为Bi_2(SrCa)O_4和（SrCa）CuO_2的伪二元相图。利用不受晶体表面反射光偏振干扰的相衬显微镜对生长晶体进行了光学显微研究。

项目成果

S.Hayashi: "Prepartion of high Tc Single Crystals of GdBa_2Cu_3O_<7-6>" Superconductor. (1991)

S.Hayashi：“GdBa_2Cu_3O_<7-6>高Tc单晶的制备”超导体。

H. Komatsu: "Growth and Characterization of high Tc superconductor single crystals" Mol. Chrust. Liq. Cryst. 184. 25-32 (1990)

H. Komatsu：“高 Tc 超导体单晶的生长和表征”Mol。

S.Hayashi;T.Ohno;T.Inoue;H.Komatsu: Journal of Crystal Growth. 91. 331-333 (1988)

S.Hayashi；T.Ohno；T.Inoue；H.Komatsu：晶体生长杂志。

H.Komatsu: "Growth and chaaracerization of high Tc superconductor single crystals" Mol.Cryst.Liq.Cryst.184. 25-32 (1990)

H.Komatsu：“高 Tc 超导体单晶的生长和表征”Mol.Cryst.Liq.Cryst.184。

S.Hayashi;H.Komatsu;T.Inoue;T.Ono,K.Sasaki;Y.Koike;T.Fukase: J.J.A.P.(Japanese Journal of Applied Physics). 26. L1197-L1198 (1987)

S.Hayashi；H.Komatsu；T.Inoue；T.Ono，K.Sasaki；Y.Koike；T.Fukase：J.J.A.P.（日本应用物理学杂志）。