2007/08/16 by D. Huang, D H Huang, X R Liu +8 · 1 citation
Earth and Planetary Sciences · Chemistry · Physics and Astronomy · #High-pressure geophysics and materials #Chemical Thermodynamics and Molecular Structure #Force Microscopy Techniques and Applications
paper · doi:10.1088/0022-3727/40/17/047
Using a large pressure-jump apparatus and Bridgman anvils, the Grüneisen parameters of iron and copper were measured under high pressures of 4.58–7.49 GPa and 4.40–6.25 GPa, respectively. Substitution of ΔT/ΔP for ∂T/∂P at median pressure is strictly justified and the Grüneisen parameter at the median pressure was determined by a modified thermodynamic relationship γ (Pm) = [Ks(Pm)/T(Pm)](ΔT/ΔP), where Pm indicates the median pressure, and adiabatic correction of the temperature change was completed through analysing the experimental data. The new γ values obtained are reconcilable with previous reports, and their tendency with pressure is also in good agreement with the previous work. The results suggest that the improved method is reliable for measurements of the Grüneisen parameter at high pressure, and is promising for such measurements to the higher pressure range.