TY JOUR TI KW оксиды KW химическая природа KW система химических связей и соединений KW oxides KW chemical nature KW system of chemical bonds and compounds JO Herald of Technological University AU Sirotkin, O.S. AU Sirotkin, R.O. AU Pavlova, A.M. PY 2025 IS 17 PB Kazan National Research Technological University