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High P-T phase transitions and P-V-T equation of state of hafnium

We measured the volume of hafnium at several pressures up to 67 GPa and at temperatures between 300 to 780 K using a resistively heated diamond anvil cell with synchrotron x-ray diffraction at the Advanced Photon Source. The measured data allows us to determine the P-V-T equation of state of hafnium... Full description

Journal Title: Journal of Applied Physics 01 June 2012, Vol.111(11)
Main Author: Hrubiak, Rostislav
Other Authors: Drozd, Vadym , Karbasi, Ali , Saxena, Surendra K.
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4726211
Link: http://dx.doi.org/10.1063/1.4726211
Zum Text:
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recordid: aip_complete10.1063/1.4726211
title: High P-T phase transitions and P-V-T equation of state of hafnium
format: Article
creator:
  • Hrubiak, Rostislav
  • Drozd, Vadym
  • Karbasi, Ali
  • Saxena, Surendra K.
subjects:
  • Special Topic: Invited Papers From The 6th Meeting Of The Study Of Matter At Extreme Conditions , Miami, Florida, USA, 2011
ispartof: Journal of Applied Physics, 01 June 2012, Vol.111(11)
description: We measured the volume of hafnium at several pressures up to 67 GPa and at temperatures between 300 to 780 K using a resistively heated diamond anvil cell with synchrotron x-ray diffraction at the Advanced Photon Source. The measured data allows us to determine the P-V-T equation of state of hafnium. The previously described [Xia et al. , Phys. Rev. B 42 , 6736–6738 (1990)] phase transition from hcp ( α ) to simple hexagonal ( ω ) phase at 38 GPa at room temperature was not observed even up to 51 GPa. The ω phase was only observed at elevated temperatures. Our measurements have also improved the experimental constraint on the high P-T phase boundary between the ω phase and high pressure bcc ( β ) phase of hafnium. Isothermal room temperature bulk modulus and its pressure derivative for the α- phase of hafnium were measured to be B 0  = 112.9 ± 0.5 GPa and B 0 ′ = 3.29 ± 0.05, respectively. P-V-T data for the α- phase of hafnium was used to obtain a fit to a thermodynamic P-V-T equation of state based on model by Brosh et al. [CALPHAD 31 , 173–185 (2007)].
language: eng
source:
identifier: ISSN: 0021-8979 ; E-ISSN: 1089-7550 ; DOI: 10.1063/1.4726211
fulltext: fulltext
issn:
  • 0021-8979
  • 1089-7550
  • 00218979
  • 10897550
url: Link


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titleHigh P-T phase transitions and P-V-T equation of state of hafnium
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subjectSpecial Topic: Invited Papers From The 6th Meeting Of The Study Of Matter At Extreme Conditions , Miami, Florida, USA, 2011
descriptionWe measured the volume of hafnium at several pressures up to 67 GPa and at temperatures between 300 to 780 K using a resistively heated diamond anvil cell with synchrotron x-ray diffraction at the Advanced Photon Source. The measured data allows us to determine the P-V-T equation of state of hafnium. The previously described [Xia et al. , Phys. Rev. B 42 , 6736–6738 (1990)] phase transition from hcp ( α ) to simple hexagonal ( ω ) phase at 38 GPa at room temperature was not observed even up to 51 GPa. The ω phase was only observed at elevated temperatures. Our measurements have also improved the experimental constraint on the high P-T phase boundary between the ω phase and high pressure bcc ( β ) phase of hafnium. Isothermal room temperature bulk modulus and its pressure derivative for the α- phase of hafnium were measured to be B 0  = 112.9 ± 0.5 GPa and B 0 ′ = 3.29 ± 0.05, respectively. P-V-T data for the α- phase of hafnium was used to obtain a fit to a thermodynamic P-V-T equation of state based on model by Brosh et al. [CALPHAD 31 , 173–185 (2007)].
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descriptionWe measured the volume of hafnium at several pressures up to 67 GPa and at temperatures between 300 to 780 K using a resistively heated diamond anvil cell with synchrotron x-ray diffraction at the Advanced Photon Source. The measured data allows us to determine the P-V-T equation of state of hafnium. The previously described [Xia et al. , Phys. Rev. B 42 , 6736–6738 (1990)] phase transition from hcp ( α ) to simple hexagonal ( ω ) phase at 38 GPa at room temperature was not observed even up to 51 GPa. The ω phase was only observed at elevated temperatures. Our measurements have also improved the experimental constraint on the high P-T phase boundary between the ω phase and high pressure bcc ( β ) phase of hafnium. Isothermal room temperature bulk modulus and its pressure derivative for the α- phase of hafnium were measured to be B 0  = 112.9 ± 0.5 GPa and B 0 ′ = 3.29 ± 0.05, respectively. P-V-T data for the α- phase of hafnium was used to obtain a fit to a thermodynamic P-V-T equation of state based on model by Brosh et al. [CALPHAD 31 , 173–185 (2007)].
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abstractWe measured the volume of hafnium at several pressures up to 67 GPa and at temperatures between 300 to 780 K using a resistively heated diamond anvil cell with synchrotron x-ray diffraction at the Advanced Photon Source. The measured data allows us to determine the P-V-T equation of state of hafnium. The previously described [Xia et al. , Phys. Rev. B 42 , 6736–6738 (1990)] phase transition from hcp ( α ) to simple hexagonal ( ω ) phase at 38 GPa at room temperature was not observed even up to 51 GPa. The ω phase was only observed at elevated temperatures. Our measurements have also improved the experimental constraint on the high P-T phase boundary between the ω phase and high pressure bcc ( β ) phase of hafnium. Isothermal room temperature bulk modulus and its pressure derivative for the α- phase of hafnium were measured to be B 0  = 112.9 ± 0.5 GPa and B 0 ′ = 3.29 ± 0.05, respectively. P-V-T data for the α- phase of hafnium was used to obtain a fit to a thermodynamic P-V-T equation of state based on model by Brosh et al. [CALPHAD 31 , 173–185 (2007)].
pubAmerican Institute of Physics
doi10.1063/1.4726211
date2012-06-01