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Abstract
The spreading of the phase transition temperature value in the incommensurate KSc(MoO4)2 is observed. This value varies in the temperature range of 254–264 K. To account for this phenomenon the existence of defects created spontaneously in the crystal is suggested. A non-linear coupling of these defects with the order parameter described in the weak pinning limit alters Ti and does not destroy the long-range order.