Diamagnetic Orientation of Clay Mineral Grains

概要

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The orientations of diamagnetic mineral grains in magnetic fields are observed, forthe first time, in suspensions of clay minerals such as talc, kaolinite and sericite. Theminerals consist of two-dimensional crystal layers which produce intrinsicdiamagnetic anisotropy, A 7, in the unit cell. In the case of talc suspension with theaverage diameter of cp 2.4 7tnn and the thickness of 0.2 /f1T1, the grains show full orien-tation in a magnetic field of less than 0.5 T. As the size of the grains becomes smaller,full orientation is achieved with higher fields. This size dependence occurs because thefield-induced anisotropic energy of a grain is proportional to NA z, where N is thenumber of unit cells in the grain.
社団法人日本物理学会の論文
1991-10-15