Abstract
EPR studies were performed on MgSiF6.6H2O single crystals using Mn2+ paramagnetic probes substituted for Mg2+ ions. The spin-Hamiltonian parameters (SHPs) are determined accurately for the different phases: the monoclinic phase below Tc=301 K, the rhombohedral phase above T0=370 K and the intermediate phase between Tc and T0. The sets of SHPs are interpreted in the light of structural changes between these phases. The EPR line features in the intermediate phase are analysed in the framework of a static and an order-disorder model. We interpret the EPR spectrum behaviours around T0-20 K as the occurrence of a crossover between static and dynamic disorder in the material.
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