Production of pseudo single crystals using magnetic anisotropy

利用磁各向异性生产赝单晶

• 批准号: 23656479
• 负责人: YASUDA Hideyuki
• 金额: $ 2.41万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23656479/
• 关键词: 磁気配向; 磁気科学; 磁場配向; 結晶配向; 単結晶; 擬単結晶

Aim of this research is to produce bulk pseudo single crystals from fine particles with single grain by using anisotropy of magnetic susceptibility. The principle quite differs from the conventional melt growth process for production of single crystals. In particular, (1) optimization of anisotropic magnetic field and physical properties of fluid suspending FeSi2particles were examined, (2) “green” bulk specimen with three-dimensional alignment was produced by slip casting under an anisotropic magnetic field, (3) the green specimen was sintered for producing bulk pseudo single crystal, and (4) evaluation of crystallographic alignment for FeSi2 with orthorhombic symmetry. (1) According to the analysis of relationship between oscillating magnetic field and degree of alignment, alignment depended on condition of oscillating magnetic field. The optimized oscillating magnetic field resulted in production of “green” specimen with three dimensional alignment. (2) Influence of viscosity of fluid on degree of alignment was also analyzed and the “green” specimen with three-dimensional alignment was produced by slip casting. (3) Bulk pseudo single crystals were produced by sintering the green bulk specimen. (4) X-ray diffraction showed that miss orientation of grains in the bulk pseudo single crystal was 5 degrees. The result contributed to building fundamentals for producing bulk pseudo single crystals.

本研究的目的是利用磁化率的各向异性，从单晶的细小颗粒中制备出块体假单晶。其原理与生产单晶的传统熔体生长工艺截然不同。重点研究了(1)悬浮液中FeSi2颗粒各向异性磁场和物理性质的优化，(2)在各向异性磁场作用下注浆法制备了三维取向的“绿色”块体样品，(3)烧结制备了块体伪单晶，(4)评价了具有正交对称性的FeSi2的晶体取向。(1)通过分析振荡磁场与取向程度的关系，得出取向取决于振荡磁场的条件。优化的振荡磁场产生了具有三维取向的“绿色”样品。(2)分析了流体粘度对取向度的影响，采用注浆法制备了具有三维取向度的“绿色”试件。(3)通过对生坯样品的烧结制得块状伪单晶。(4)X射线衍射仪分析表明，大块伪单晶中的晶向错位取向为5度。这一结果为制备块状伪单晶奠定了基础。

项目成果

磁場による斜方晶FeSi2の３軸配向に及ぼす保持流体粘度の影響

磁场下残留流体粘度对斜方FeSi2三轴取向的影响

• 发表时间: 2012
• 作者: 黒川恵史;中塚憲章;安田秀幸;吉矢真人;柳楽知也
• 通讯作者: 柳楽知也

三軸配向組織を有する斜方晶FeSi2 焼結体の作製

三轴取向结构斜方FeSi2烧结体的制备

• 发表时间: 2012
• 作者: 中塚憲章;黒川恵史;安田秀幸;吉矢真人;柳楽知也
• 通讯作者: 柳楽知也

斜方晶FeSi2の３軸の磁場配向に及ぼす保持流体粘度の影響

残留流体粘度对斜方FeSi2三轴磁场取向的影响

• 发表时间: 2012
• 作者: 黒川恵史;中塚憲章;安田秀幸;吉矢真人;柳楽知也
• 通讯作者: 柳楽知也

磁場による斜方晶 FeSi2 の3軸配向に及ぼす保持流体粘度の影響

残留流体粘度对磁场诱导斜方FeSi2三轴取向的影响

• 发表时间: 2012
• 作者: 黒川恵史;中塚憲章;安田秀幸;吉矢真人;柳楽知也
• 通讯作者: 柳楽知也

斜方晶 FeSi2 の3軸の磁場配向に及ぼす保持流体粘度の影響

滞留液粘度对斜方FeSi2三轴磁场取向的影响

• 发表时间: 2012
• 作者: 黒川恵史;中塚憲章;安田秀幸;吉矢真人;柳楽知也
• 通讯作者: 柳楽知也