The Change of the Structure of Mordenite in the Process of the Phase Transition in Solid State

In this paper, we extend our previous work and the change of the structure of mordenite in the process of the phase transition in solid state-solid state above 800℃ were investigated by the experiment method of X-ray diffraction, infrared spectroscopy and Mössbauer spectroscopy. The experiment showed that the different cation exchange mordenite had the different velocity of the phase transition. The process of the dehydration and the binding between the cation and anion framwork played the important part in the process of the phase transition, which promotes the deformation of the unit tetrahedral. At last the ordered network framwork changed into the disordered network topology structure of the amorphous solid mordenite, the primary building unit of which was the deformed Si（Al）O₄ tetrahedral.