Crystalline Engineering using High Magnetic Field for Fabrication of Functional Materials

使用高磁场制造功能材料的晶体工程

• 批准号: 16205018
• 负责人: KISHIO Kohji
• 金额: $ 28.12万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16205018/
• 关键词: magnetic field; high-Tc superconductor; layered oxides; optical materials; melt-solidification; grain orientation; 磁場; 熱電変換材料; 配向; 溶解凝固

The purpose of this project is investigation on effects of magnetic field to the melt-growth process and clarification of magnetic properties of several novel materials. For this purpose we have chosen high temperature superconductors such as RE123 system and Bi system, thermoelectric materials such as bismuth cobaltite and Ca12Al14O33 for optoelectronic applications. Effects of magnetic fields during melt growth for ErBa2Cu3Oy, Ca12Al14O33 and (Bi.Pb)2Sr2Co2Oy were clarified. While there were not clear effect on crystallinity but several positive effects were observed on the behavior of oxygen bubbles and distribution coefficient of cations at liquid-solid interface in a floating zone method. In the case of peritectic reaction, improvement of crystallinity was observed and the control of orientation in layered oxide by magnetic field has been also intensively studied. We have investigated changes of magnetic anisotropy and easy axis of magnetization induced by locally structural changes and magnetic ions in various layered systems. In the case of RE123 system, it was found that RE ions had crucial role not only to easy axis of magnetization but also determination factor of magnetic field for orientation. In best case minimum magnetic field for control of was estimated around 1T, and this value was one order of magnitude smaller than that of usual superconducting magnet.

本计画的目的是研究磁场对熔融成长过程的影响，并厘清几种新材料的磁性。为此，我们选择了高温超导体如RE_（123）系统和Bi系统，热电材料如铋钴酸盐和Ca_（12）Al_（14）O_（33）用于光电应用。阐明了磁场对ErBa_2Cu_3O_y、Ca_（12）Al_（14）O_（33）和（Bi.Pb）_2Sr_2Co_2O_y熔体生长的影响。虽然没有明确的结晶度的影响，但在浮区法中观察到一些积极的影响，在液-固界面处的氧泡和阳离子的分配系数的行为。在包埋反应的情况下，观察到结晶度的改善，并且还深入研究了磁场对层状氧化物中取向的控制。我们研究了不同层状体系中局部结构变化和磁性离子引起的磁各向异性和易磁化轴的变化。在RE_（123）体系中，发现RE离子不仅对易磁化轴起决定性作用，而且对取向的磁场决定因素也起决定性作用。在最好的情况下，用于控制的最小磁场估计在1 T左右，并且该值比通常的超导磁体小一个数量级。

项目成果

強磁場環境を利用した高機能性酸化物の開発

利用强磁场环境开发高功能氧化物

• 发表时间: 2005
• 期刊: セラミックス 40・3
• 作者: Y. H. Cho;G. Suzuki;Y. Kawakami;和田 真一;Y. Asano ed. al.;堀井滋
• 通讯作者: 堀井滋

Combined texture- microstructure-structure analysis of comples oxides : examples of polyphased Bi2223 superconducting and Co349 thermoelectric textured ceramics characterization using neutron and x-ray diffraction

复合氧化物的织构-微观结构-结构组合分析：使用中子和 X 射线衍射表征多相 Bi2223 超导和 Co349 热电织构陶瓷的示例

• 发表时间: 2005
• 期刊: J. Appl. Cryst 38
• 作者: Kyou Suga;et al.;白川 英二;E. Guilmeau
• 通讯作者: E. Guilmeau

"微量元素置換したRE123溶融凝固バルクのピンニング特性"

“微量元素替代的 RE123 熔体凝固块体的钉扎特性”

• 发表时间: 2007
• 作者: S. Fukao;et. al.;石井 悠衣
• 通讯作者: 石井 悠衣

Development of thermoelectric Bi-based cobaltites with an easy axis of magnetization parallel to the c-axis for magnetic alignment

开发易磁化轴平行于 c 轴的热电铋基钴矿，用于磁对准

• 发表时间: 2005
• 期刊: Jpn. J. Appl. Phys. 44
• 作者: Umesaki K;Kikuchi H;T. Kumagai
• 通讯作者: T. Kumagai

Development of layered cobalt-oxides with highly thermoelectric performance

具有高热电性能的层状氧化钴的开发

• 发表时间: 2005
• 期刊: Kagaku-Kogyo 56
• 作者: Y. Yasui;et. al.;S. Horii
• 通讯作者: S. Horii