Abstract
Here we report that the equation of state (EOS) of Mo is obtained by an integrated technique of laser-heated DAC and synchrotron X-ray diffraction. The cold compression and thermal expansion of Mo have been measured up to 80 GPa at 300 K, and 92 GPa at 3470 K, respectively. The P-V-T data have been treated with both thermodynamic and Mie–Grüneisen-Debye methods for the thermal EOS inversion. The results are self-consistent and in agreement with the static multi-anvil compression data of Litasov et al. (J. Appl. Phys. 113, 093507 (2013)) and the theoretical data of Zeng et al. (J. Phys. Chem. B 114, 298 (2010)). These high pressure and high temperature (HPHT) data with high precision firstly complement and close the gap between the resistive heating and the shock compression experiment.
Highlights
High-pressure studies on materials have attracted a great enthusiasm, which allows tuning the atomic, electronic structure and produces novel materials
The two recent static experiments reported by Zhao et al.[14] and Litasov et al.[15] have measured the pressure–volume -temperature (P-V-T) equation of state (EOS) for Mo with in situ synchrotron X-ray diffraction (XRD) or neutron-diffraction techniques
We have performed in situ synchrotron XRD measurements integrated with the double-side laser-heated diamond anvil cell (DAC) techniques to obtain the P-V-T EOS of Mo to higher precision and at higher P-T conditions
Summary
High-pressure studies on materials have attracted a great enthusiasm, which allows tuning the atomic, electronic structure and produces novel materials. We have obtained the EOS of Mo up to 100 GPa and 3000 K by an integrated technique of laser-heated DAC and synchrotron XRD. The two recent static experiments reported by Zhao et al.[14] and Litasov et al.[15] have measured the P-V-T EOS for Mo with in situ synchrotron XRD or neutron-diffraction techniques. The data of Zhao et al were obtained by a DIA-type cubic anvil press up to 10 GPa and 1475 K, with NaCl as the pressure scale and PTM14. We have performed in situ synchrotron XRD measurements integrated with the double-side laser-heated DAC techniques to obtain the P-V-T EOS of Mo to higher precision and at higher P-T conditions. The present technique with higher precision complements the data gap between the multi-anvil apparatuses and the shock compression experiments
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