Abstract
Questions concerning the detailed nature of the proposed low-spin-high-spin Fe2+ transition in 1T-FexTa1-xS2 are resolved by a quantitative interpretation of the Mossbauer and magnetic susceptibility evidence. It is established that the low-spin-high-spin energy gap Eg is temperature-dependent and that this temperature dependence can be quantitatively understood in terms of a lattice vibrational modulation of crystal-field and Hund's rule energies.