Ultrahigh pressure equation of state of tantalum to 310 GPa

Ultrahigh pressure equation of state of tantalum to 310 GPa
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钽超高压状态方程至310GPa

DOI:
10.1080/08957959.2019.1641203
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发表时间:
2019
影响因子:
2
通讯作者:
Vohra, Yogesh K.
Vohra, Yogesh K.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Burrage, Kaleb C.;Perreault, Christopher S.;Moss, Eric K.;Pigott, Jeffrey S.;Sturtevant, Blake T.;Smith, Jesse S.;Velisavljevic, Nenad;Vohra, Yogesh K.

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The isothermal compression of transition metal tantalum (Ta) was studied in a diamond anvil cell by X-ray diffraction utilizing rhenium (Re) and gold (Au) as internal X-ray pressure standards. TheRepressure marker was employed during non-hydrostatic compression to pressures up to 310 GPa while theAupressure marker was used during quasi-hydrostatic compression in a neon pressure-transmitting medium to 80 GPa. Two ultra-high pressure experiments were conducted onTaandRemixtures utilizing focused-ion beam machined toroidal diamond anvils with central flats varying from 8 microns to 16 microns in diameter. TheTametal was observed to be stable in the body-centered-cubic phase to a volume compressionV/V0= 0.581. The measured equations of state (EOS) ofTausing two different calibrations of theRepressure marker are compared with the ambient temperature isotherm derived from shock compression data. We provide a detailed analysis of EOS fit parameters forTaunder quasi-hydrostatic and non-hydrostatic conditions.
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