We have fabricated multiply coated glass spheres with diameters of 45(±2)μm that exhibit appreciable magneto-, as well as electrorheological responses. Under crossed electric and magnetic fields, the microspheres were observed to form columnar crystallites with a structure that transforms from body-centered tetragonal to face-centered cubic as the ratio between the magnetic and the electric fields exceeded a minimum value. The observed transition scenario is in excellent agreement with calculations based on the model of field induced crystal formation and structural transition.
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Wen et al. (1999) studied this question.
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