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Continuous Sound Velocity Measurements along the Shock Hugoniot Curve of Quartz.
Li, Mu; Zhang, Shuai; Zhang, Hongping; Zhang, Gongmu; Wang, Feng; Zhao, Jianheng; Sun, Chengwei; Jeanloz, Raymond.
Afiliación
  • Li M; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
  • Zhang S; Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
  • Zhang H; Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
  • Zhang G; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
  • Wang F; Institute of Applied Physics and Computational Mathematics, Beijing 100094, China.
  • Zhao J; Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
  • Sun C; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
  • Jeanloz R; Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
Phys Rev Lett ; 120(21): 215703, 2018 May 25.
Article en En | MEDLINE | ID: mdl-29883175
We report continuous measurements of the sound velocity along the principal Hugoniot curve of α quartz between 0.25 and 1.45 TPa, as determined from lateral release waves intersecting the shock front as a function of time in decaying-shock experiments. The measured sound velocities are lower than predicted by prior models, based on the properties of stishovite at densities below ∼7 g/cm^{3}, but agree with density functional theory molecular dynamics calculations and an empirical wide-regime equation of state presented here. The Grüneisen parameter calculated from the sound velocity decreases from γ∼1.3 at 0.25 TPa to 0.66 at 1.45 TPa. In combination with evidence for increased (configurational) specific heat and decreased bulk modulus, the values of γ suggest a high thermal expansion coefficient at ∼0.25-0.65 TPa, where SiO_{2} is thought to be a bonded liquid. From our measurements, dissociation of the molecular bonds persists to ∼0.65-1.0 TPa, consistent with estimates by other methods. At higher densities, the sound velocity is close to predictions from previous models, and the Grüneisen parameter approaches the ideal gas value.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Phys Rev Lett Año: 2018 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Revista: Phys Rev Lett Año: 2018 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos