Determination of the melting temperature of minerals from the kinetic parameters of ionic conductivity (a case study of phlogopite)

A method for determining the formation energy of vacancies in phlogopite is proposed, based on an analysis of how elementary defects in its crystal lattice, associated into complexes, influence the temperature dependence of its electric conductivity. The existence of a linear relationship between the melting temperature and vacancy formation energy for the studied phlogopite samples with different impurity contents was shown. The author calculated the dependence of the obtained melting temperatures on the content of the $\rm Al{,}~\rm Mg{,}$ and $\rm F$ components in phlogopite samples, which, when associated into complexes, activate the formation of elementary lattice defects.