A high magnetic field is a useful tool to control the crystal alignment of ceramic
materials. In this study, a horizontal 10T static magnetic field was imposed on slurry containing
hydroxyapatite (HAp) crystals under the horizontal mold rotation during slip casting process so as
to introduce uni-axial alignment for some amount of crystals in the sample, and then it was
sintered in atmosphere without the magnetic field. From X-ray diffraction, it has been found that
the HAp crystals in the sample treated with the mold rotation under the magnetic field were
aligned its c-axis to a particular direction.