1. Institute of Physics of the Dagestan Scientific Center of the Russian Academy of Sciences, Makhachkala 367030, Dagestan, Russia Federation
2. Thermophysical Properties Division, Geothermal & Renewal Energy Institute, High Temperature Joint Institute of the Russian Academy of Sciences, Makhachkala 367026, Russian Federation
3. Dagestan State University, Makhachkala 367000, Russian Federation