THE STRUCTURE OF MOLTEN CUBR

Reverse Monte Carlo modelling of isotopic substitution neutron diffrac tion data for molten CuBr (D Allen and R A Howe 1992 J. Phys.: Condens . Matter 4 6029) is used to show that a flat partial radial distributi on function g(CuCu)(r) is a possible numerical solution, but not a pos sible physical solution. The best model derived is a close-packed liqu id of Br- ions within which Cu+ ions occupy approximately tetrahedral interstices. This structure is a natural continuation of trends as a f unction of temperature within the crystalline gamma-phase and the fast -ion-conducting beta- and alpha-phases.