Production of pseudo single crystals using magnetic anisotropy

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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.