Open AccessThermodynamic properties of bcc-Fe to melting temperature and pressure to 15 GPa
Author(s) -
Peter I. Dorogokupets,
Т. С. Соколова,
Konstantin D. Litasov
Publication year - 2014
Publication title -
geodinamika i tektonofizika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.336
H-Index - 8
ISSN - 2078-502X
DOI - 10.5800/gt-2014-5-4-0166
Subject(s) - thermodynamics , helmholtz free energy , atmospheric temperature range , equation of state , melting temperature , melting point , materials science , diffraction , enthalpy , chemistry , physics , optics , composite material
Based on Helmholtz’s free energy, an equation of state of iron (bcc-Fe) is constructed with simultaneous optimization of ultrasonic, X-ray diffraction, dilatometric, and thermochemical measurements in the temperature range from 100 K to the melting points and pressures up to 15 GPa. Calculated thermodynamic functions of bcc-Fe are in good agreement with the reference data and experimental measurements at room pressure, as well as with P–V–T measurements at temperatures up to 773 K and pressures up to 16 GPa. The calculated thermodynamic properties of bcc-Fe (x, a, S, CP, CV, KT, KS, K', GT,P) are tabulated up to 1811 K and 15 GPa. The calculated P–V–T relations for bcc-Fe can be used to calculate pressures at given temperatures and volumes.