Pressure-volume data for -type NaCl. The circles and squares denote the volumes from GGA and LDA calculations at . The solid line denotes the pressure-volume curve at based on the experimental data (Ref. 7).
Deviations of pressures of -type NaCl between the present calculations and the previous EOS. The solid circles denote the differences relative to the previous EOS (Ref. 7) for -type NaCl as a function of . Positive deviations correspond to the previous EOS predicting higher pressures than the present calculations using GGA method.
Examples of temperature and pressure fluctuations of ab initio molecular dynamics simulation. The dots denote temperature and pressure values at step. The volume was fixed during calculation. The cubic supercell containing 54 atoms was used.
Pressure-volume data for -type NaCl at . The solid lines denote the volume changes calculated by the GGA and LDA methods. Solid diamonds denote the volumes from experimental study (Ref. 15). Volumes were normalized at .
Isothermal volume changes of -type NaCl. The solid lines denote the calculated isotherms at temperatures of 300, 1500, .
Bulk modulus of NaCl. The Birch–Murnaghan equation of state was used to calculate the bulk moduli of -type NaCl. : isothermal bulk modulus; : first pressure deviation of bulk modulus; : volume at ambient pressure.
Comparison of bulk modulus of -type NaCl at . The Birch-Murnaghan equation of state was used to calculate the bulk moduli of -type NaCl of this study.
Comparison of transition pressure of NaCl.
Thermoelastic parameters of -type NaCl. The reference pressure, subscript , is .
Pressure-temperature-volume table of -type NaCl from this study. Reference volume is from experimental study. (Ref. 25). Unit of pressure is given in GPa.
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