High-pressure single-crystal elasticity study of CO2 across phase I-III transition

Jin S. Zhang, Sean R. Shieh, Jay D. Bass, Przemyslaw Dera, Vitali Prakapenka

Research output: Contribution to journalArticle

Abstract

Sound velocities and elastic moduli of solid single-crystal CO2 were measured at pressures up to 11.7(3) GPa by Brillouin spectroscopy. The aggregate adiabatic bulk modulus (KS), shear modulus (G), and their pressure derivatives for CO2 Phase I are KS0 = 3.4(6) GPa, G0 = 1.8(2) GPa, (dKS/dP)0 = 7.8(3), (dG/dP)0 = 2.5(1), (d2KS/dP2) 0 = -0.23(3) GPa-1, and (d2G/dP 2)0 = -0.10(1) GPa-1. A small increase of elastic properties was observed between 9.8(1) and 10.5(3) GPa, in agreement with the CO2 I-III transition pressure determined from previous x-ray diffraction experiments. Above the transition pressure PT, we observed a mixture dominated by CO2-I, with minor CO2-III. The CO2-I + III mixture shows slightly increased sound velocities compared to pure CO2-I. Elastic anisotropy calculated from the single-crystal elasticity tensor exhibits a decrease with pressure beginning at 7.9(1) GPa, which is lower than PT. Our results coincide with recent X-ray Raman observations, suggesting that a pressure-induced electronic transition is related to local structural and optical changes.

Original languageEnglish (US)
Article number141901
JournalApplied Physics Letters
Volume104
Issue number14
DOIs
StatePublished - Apr 7 2014

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elastic properties
transition pressure
single crystals
acoustic velocity
elastic anisotropy
bulk modulus
modulus of elasticity
x ray diffraction
tensors
shear
electronics
spectroscopy
x rays

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

High-pressure single-crystal elasticity study of CO2 across phase I-III transition. / Zhang, Jin S.; Shieh, Sean R.; Bass, Jay D.; Dera, Przemyslaw; Prakapenka, Vitali.

In: Applied Physics Letters, Vol. 104, No. 14, 141901, 07.04.2014.

Research output: Contribution to journalArticle

Zhang, Jin S. ; Shieh, Sean R. ; Bass, Jay D. ; Dera, Przemyslaw ; Prakapenka, Vitali. / High-pressure single-crystal elasticity study of CO2 across phase I-III transition. In: Applied Physics Letters. 2014 ; Vol. 104, No. 14.
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