Abstract
The topography of crystal surfaces of ferroelastic KFe(MoO4)2 was imaged with atomic force microscopy AFM. Images revealed stepped surfaces with step heights corresponding to the multiple of the crystal lattice c constant in the paraphase. It has been found that the surface deflection at ferroelastic domain boundaries is probably due to monoclinic crystal structure. Increasing the temperature of the crystal to the temperature of phase transition T1 caused changes in the image of the domain structure and a systematic decrease in the angle between the surfaces of the adjacent domains; the domain structure disappeared just below T1.
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