TY JOUR TI Mathematical approach to the study of the mullite synthesis process KW kaolinite KW mullite KW mineral phases KW solid-phase synthesis KW structural transformations KW mathematical model KW composite JO Vestnik of geosciences AU Ponaryadov, A.V. AU Ustyugov, V.A. AU Kotova, E.L. PY 2022 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"