The areas of the fusion and crystallization peaks of K3TaF8 and K3TaOF6 have been measured using the DSC mode of the high-temperature calorimeter (SETARAM 1800 K). On the basis of these quantities and the temperature dependence of the used calorimetric method sensitivity, the values of the enthalpy of fusion of K3TaF8 at temperature of fusion 1039 K: Delta H-fus(m)(K3TaF8; 1039 K) = (52 +/- 2) kJ mol(-1) and of K3TaOF6 at temperature of fusion 1055 K: Delta H-fus(m) (K(3)TAOF(6); 1055 K) =(62 +/- 3) kJ mol(-1) have been determined. (C) 2006 Elsevier B.V. All rights reserved.