Ternary thermodynamics by computer-aided Knudsen cell mass spectrometry: Bcc solid ternary Fe–Co–Cr alloys

Abstract

Thermodynamic investigations on bcc solid ternary Fe–Co–Cr alloys have been performed by means of the computer-aided Knudsen cell mass spectrometry. The “Digital Intensity-Ratio” (DIR) method has been applied for the determination of the thermodynamic mixing behavior. The ternary thermodynamically adapted power (TAP) series concept is used for the algebraic representation of the molar excess properties. The corresponding TAP parameters, and the values of the molar excess quantities Z E ( Z = Gibbs energy G, heat of mixing H, and entropy S) as well as the thermodynamic activities of all three constituents at 1673 K are presented.