Abstract: Monte Carlo simulation calculation with an elctronic computer was performed on melts of cryolite-alumina. The characterization of the local structure and radial distribution functions of the molten salt were computed at 1283 K. In the melt Al³⁺ ions tended to have a preferential averaged coordination number of 3. 4F^-. It is found that there exist complex ionic AlF₄^-,AlF₅^2-,and AIOF₃^2-, AlOF₂^- etc. There also exist oxygen-bridge [AlF₃ - O - A1F₃]^2- and flourine-bridge [F₃A1- F -A1F₂]^- ionic clusters due to the mutual reactions among various species in the molten salt.

Key words: Melts, Complex ions, Radial distribution functions