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Title: Shock compression of crystalline TeO2 to the high-pressure fluid regime: Insights from ab initio molecular dynamics simulations

Journal Article · · Journal of Applied Physics
DOI: https://doi.org/10.1063/5.0235106 · OSTI ID:2477491

The shock response of fully-dense and porous crystalline tellurium dioxide (TeO2⁠) to the high-pressure and high-temperature fluid regime was investigated within the framework of density functional theory with Mermin’s generalization to finite temperatures. The principal and porous shock Hugoniot curves were predicted from canonical ab initio molecular dynamics (AIMD) simulations, with the phase space sampled along isotherms up to 80 000 K, for densities ranging from ρ = 3 to 17 g/cm3. The polymorphs investigated are α-TeO2 paratellurite (⁠P41212), TeO2 cotunnite (⁠Pnma⁠), and TeO2 post-cotunnite (⁠P21/m⁠). Based on the discontinuity found in the calculated Us – up slope of TeO2 post-cotunnite at a shock velocity of Us ≃ 8.35km/s and a particle velocity of up ≃ 3.64 km/s, the shock melting temperature and pressure are predicted to be ≃ 6500 K and ≃ 170 GPa. Results from the AIMD simulations are in line with the static compression data of TeO2 paratellurite and cotunnite, and with the recent shock Hugoniot data for single-crystal α- TeO2 for pressures up to 85 GPa, obtained using the inclined-mirror method and the velocity interferometer system for any reflector combined with powder gun and two-stage light-gas gun.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
2477491
Report Number(s):
SAND--2024-15564J
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 18 Vol. 136; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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