NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2020, 11 (2), P. 153–160
Model of destruction of montmorillonite crystal structure in a microwave field
V. N. Makarov – Orenburg State University, Victory Ave. 13, Orenburg, 460018, Russia; email@example.com
O. N. Kanygina – Orenburg State University, Victory Ave. 13, Orenburg, 460018, Russia
We address amorphization of montmorillonite crystal structure. Powdered montmorillonite samples with an effective particle diameter D≤630μm were treated by microwave field with the frequency 2:45 GHz and power 750 W for ten minutes in different environments. The first sample was treated in an air environment, the second one in a humid environment. The third sample was a ceramic mass with 10% concentration of mixing water (with respect to the total mass). The model describing amorphization is based on results of X-ray analysis. Activation energies were evaluated for covalently and ionically bound oxygen ions, hydroxyl groups, and silicon (aluminum) ions. It is shown that the amorphization is carried out in four stages. In fractions of the energy consumption of the last stage the first one consumes 7 – 9%, the second one takes 13 – 15%, and the third one takes 49 – 59%.
Keywords: model, amorphization, crystal structure, montmorillonite, microwave field.