Abstract
The results of EPR investigation of improper ferroelastic crystals MgGeF6·6H2O: Mn2+ allow to conclude that at Ti1=403 K these crystals undergo transition to structurally incommensurate phase. The order parameter of this transition is probably the angle of Mg[H2O]6 2+ octahedra rotation around crystal C3 axis, which determines the presence of only even terms in expanding the EPR spectra fine structure parameter on the powers of order parameter. Below 360K the appearance of structural phase soliton lattice and effect of variation of the spin-lattice relaxation rate over the spectrum have been taken into account.
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