The thermodynamic stability of several binary and ternary Chevrel phases with the general formulae Mo6X8 and Me2Mo6X8 (Me = Fe, Ni, Cu and X = S, Se, Te) was determined using high temperature oxide melt solution calorimetry. The methodology was initially developed for metals and alloys and later modified for non-oxides. Since all ternary Chevrels have similar structures, it can be assumed their entropies should be similar in magnitude, i.e. the thermodynamic stability will be determined mostly by the enthalpies of formation. Similarly for the binary phases. The thermodynamic stability of the Cu ternary chalcogenides with regard to the formation from pure element and binary chalcogenide the opposite trend as the enthalpy of formation from elements. The enthalpy of formation of Cu2Mo6S8 from Cu and Mo6S8 is positive and becomes more negative for the Cu2Mo6Se8 and particularly Cu2Mo6Te8. A possible explanation could be that the Mo6Te8 is the less stable binary chalcogenide amongst the three of them and thus would react more readily with Cu. The stability of the ternary sulfides with regard to the formation from pure element and binary chalcogenide follows the same trend as the enthalpy of formation from elements, i.e. the stability decreases as: FeMo6S8 &gt; Fe2Mo6S8 &gt; Ni2Mo6S8 &gt; Cu2Mo6S8. The thermodynamic stability of the binary Mo6X8 follows the trend: Mo6Te8 &lt; Mo6Se8 &lt; Mo6S8

Thermodynamics of Chevrel phases Mo6X8 and MeyMo6X8 (Me = Fe, Ni, Cu and X = S, Se, Te)

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