Anisotropic bulk magnetic susceptibility

The induced magnetic polarization from a heterogeneous sample can produce a nonuniform screening field, which leads to line broading. However, the susceptibility fields are small for organic materials, and the bulk-volume susceptibility is typically on the order of 1 ppm. The bulk magnetic susceptibility is inherently anisotropic for crystalline solids and cannot be removed by MAS. However, the magnitude of the effect is small ( 0.7 ppm). 

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