Generalized estimation method of interactions in melts of double halide systems. 3. Systems with similar halides of alkali and rare earth metals

The systems of similar halides on the base of alkali and rare earth metals are considered. The values of the coefficient of interaction predominance Ki.p. of one group of ions over the other are determined. It has been found that by Ki.p. values the above system form a particular field of compositions. The regularities of KCl interaction with RE chlorides of the cerium subgroup which occurs in melts with formation of complex ions [MeCl6]3- and structures of ''transition'' state [Me2Cl9]3- with KCl lack are considered. It is shown that with the transition to heavy RE the interaction in chloride system melts should be increased at the expense of ion component increase. For other halide systems the interaction energy in fluoride melts should be higher whereas bromides and iodides lower than in analogous chloride systems