MONTE-CARLO SIMULATION ON SHORT TO LONG-RANGE ORDERING IN LIXTISE2

Monte-Carlo simulations of lithium ordering are presented allowing to determine Li-Li interactions from reproduction of the Se-77 NMR lines and of the titration curve of the Li/TiSe2 system. It is shown that. o ne has to account for interaction up to the third neighbor for x > 0.5 content. This is related to the percolation threshold of the electron ic screening of the ions. Diffraction patterns simulated from the ion distributions show occurrence of long range ordering for lithium conte nt beyond 0.50.