High-temperature equation of state of vanadium. Issue 1 (2nd January 2016)

• Record Type: Journal Article
• Authors: Crichton, W. A.; Guignard, J.; Bailey, E.; Dobson, D. P.; Hunt, S. A.; Thomson, A. R.
• Is Part Of: High pressure research. Volume 36:Issue 1(2016)
• Page Start: 16
• Page End: 22
• Publication Date: 2016-01-02
• Subjects: Vanadium -- high pressure -- equation of state -- diffraction; High pressure (Science) -- Periodicals; High pressure (Technology) -- Periodicals; 536.41
• DOI: 10.1080/08957959.2015.1123256
• Languages: English
• ISSNs: 0895-7959

Abstract

ABSTRACT: The unit cell dimensions of vanadium, NaCl and Au have been collected to 11. 5 GPa and 1000 K by powder X-ray diffraction and are used to constrain a practical high-temperature EoS for bcc vanadium. The resulting third-order Birch–Murnaghan EoS is described with parameters KT 0, 300 = 150.4 ± 6.2 GPa, K T ′ = 5.5 ± 1.0, α 0 = 4.8(6)·10 −5, α 1 = −2.4(9)·10 −8 and δKT δT = −0.0446(7) GPa/K. The parameter α . K 0, 300 is 616·10 −5 K −1 GPa and reduces to zero at an estimated 60 GPa at RT. This EoS description is entirely consistent with the majority of X-ray, ultrasonic, shock wave and calculated data-sets in this p, T range. These measurements facilitate the estimation of in situ temperatures under high pressures when vanadium is used inside sample assemblies and are useful, when used with h -BN, to estimate p, T over the full range of h -BN stability.