chamber of the apparatus when the hermetic effusion cell has reached the required working temperature) [9] Results The enthalpy of formation at all the concentrations and temperatures and the activity of components at all the concentrations and one temperature (Tj= 400K.) were measured. Then in accordance with the described method by solving of equation (3) or (4) the activity (and Gibbs energy) at all the concentrations and temperatures were calculated and the rest thermodynamic functions were obtained with help of standard relations:
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