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The enthalpy of formation of the ordered phase (Ni  x  Co 1– x  ) 0.50 Al 0.50 , (Ni  x  Co 1– x  ) 0.58 Al 0.42  with (0 ≤  x  ≤ 1) and Ni 0.30 Co 0.15 Al 0.55  with the B2 (CsCl) structure was measured by differential solution calorimetry at 1073 K as a function of composition in order to describe the constitutional defects. The binary Ni 0.50 Al 0.50 -phase exhibits the most negative enthalpy of formation (–71.27 kJ mol –1 ). The absolute value of the enthalpy of formation decreases by substituting nickel for cobalt with constant aluminium content. The composition dependence of the enthalpy of formation can be described by the disorder model of Wagner and Schottky. The model provides information about the composition dependence of the concentration of the existing defects (vacancy, antistructure atom) of the ordered ternary phases.

Calorimetric Determination of the Enthalpy of Formation and the Description of the Constitutional Defects of the Ordered (Ni, Co) 1–y Al y , Phase