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Title: High-pressure single-crystal elasticity study of CO[subscript 2] across phase I-III transition

Authors:
; ; ; ;  [1];  [2];  [2];  [2]
  1. (Hawaii)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESFOREIGN
OSTI Identifier:
1150132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Appl. Phys. Lett.; Journal Volume: 104; Journal Issue: (14) ; 04, 2014
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Zhang, Jin S., Shieh, Sean R., Bass, Jay D., Dera, Przemyslaw, Prakapenka, Vitali, UC), UWO), and UIUC). High-pressure single-crystal elasticity study of CO[subscript 2] across phase I-III transition. United States: N. p., 2016. Web. doi:10.1063/1.4870526.
Zhang, Jin S., Shieh, Sean R., Bass, Jay D., Dera, Przemyslaw, Prakapenka, Vitali, UC), UWO), & UIUC). High-pressure single-crystal elasticity study of CO[subscript 2] across phase I-III transition. United States. doi:10.1063/1.4870526.
Zhang, Jin S., Shieh, Sean R., Bass, Jay D., Dera, Przemyslaw, Prakapenka, Vitali, UC), UWO), and UIUC). Fri . "High-pressure single-crystal elasticity study of CO[subscript 2] across phase I-III transition". United States. doi:10.1063/1.4870526.
@article{osti_1150132,
title = {High-pressure single-crystal elasticity study of CO[subscript 2] across phase I-III transition},
author = {Zhang, Jin S. and Shieh, Sean R. and Bass, Jay D. and Dera, Przemyslaw and Prakapenka, Vitali and UC) and UWO) and UIUC)},
abstractNote = {},
doi = {10.1063/1.4870526},
journal = {Appl. Phys. Lett.},
number = (14) ; 04, 2014,
volume = 104,
place = {United States},
year = {Fri Jul 29 00:00:00 EDT 2016},
month = {Fri Jul 29 00:00:00 EDT 2016}
}
  • Sound velocities and elastic moduli of solid single-crystal CO{sub 2} were measured at pressures up to 11.7(3) GPa by Brillouin spectroscopy. The aggregate adiabatic bulk modulus (K{sub S}), shear modulus (G), and their pressure derivatives for CO{sub 2} Phase I are K{sub S0} = 3.4(6) GPa, G{sub 0} = 1.8(2) GPa, (dK{sub S}/dP){sub 0} = 7.8(3), (dG/dP){sub 0} = 2.5(1), (d{sup 2}K{sub S}/dP{sup 2}){sub 0} = −0.23(3) GPa{sup −1}, and (d{sup 2}G/dP{sup 2}){sub 0} = −0.10(1) GPa{sup −1}. A small increase of elastic properties was observed between 9.8(1) and 10.5(3) GPa, in agreement with the CO{sub 2} I-III transition pressure determined from previous x-ray diffraction experiments. Above the transition pressure P{sub T},more » we observed a mixture dominated by CO{sub 2}-I, with minor CO{sub 2}-III. The CO{sub 2}-I + III mixture shows slightly increased sound velocities compared to pure CO{sub 2}-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 P{sub T}. Our results coincide with recent X-ray Raman observations, suggesting that a pressure-induced electronic transition is related to local structural and optical changes.« less
  • We performed the single-crystal X-ray diffraction study of a perovskite-type gold mixed-valence compound, Cs{sub 2}Au{sup I}Au{sup III}Cl{sub 6}, under high pressures up to 18 GPa by using a diamond-anvil-cell with helium gas as an ideal hydrostatic pressure-transmitting medium. The lattice parameters and the variable atomic positional parameters were obtained with reasonable accuracy at various pressures. A structural phase transition at ca. 12.5 GPa from I4/mmm to Pm3m was found. The lattice parameters a {sub 0} and c {sub 0}, denoted in the tetragonal cell setting, result in the relationship 2{sup 1/2} a {sub 0}=c {sub 0}, and the superstructure reflectionsmore » h k l (l is odd), caused by the shift of the Cl ions from the midpoint of the Au ions, disappeared at pressures above the phase transition. Both elongated [Au{sup III}Cl{sub 6}] and compressed [Au{sup I}Cl{sub 6}] octahedra in the low-pressure phase smoothly approach regular octahedra with increasing pressure. Above the structural phase transition at 12.5 GPa, all the [AuCl{sub 6}] octahedra are crystallographically equivalent, which shows that the tetragonal-to-cubic phase transition accompanies the valence transition from the Au{sup I}/Au{sup III} mixed-valence state to the Au{sup II} single-valence state. - Graphical abstract: Single-crystal X-ray diffraction study under high pressures up to 18 GPa by using a diamond-anvil-cell with helium gas as an ideal hydrostatic pressure medium has revealed that a perovskite-type gold mixed-valence compound, Cs{sub 2}Au{sup I}Au{sup III}Cl{sub 6}, exhibits the structural phase transition from tetragonal to cubic at 12.5 GPa accompanying gold valence transition.« less
  • To help our understanding of the structural and superconducting transitions in ferropnictides, partial phonon density of states (PDOS) of iron in a single-crystal SrFe2As2 pnictide have been investigated from both out-ofplane and in-plane polarizations with respect to the basal plane of the crystal structure using nuclear resonant inelastic x-ray scattering in a high-pressure diamond anvil cell at ambient temperature. The partial PDOS of iron in the pnictide crystal changes dramatically at approximately 8 GPa, which can be associated with the tetragonal(T)tocollapsedtetragonal(CT)isostructuraltransitionasevidencedinhigh-pressurex-raydiffraction measurements and theoretic calculations. Across the T-CT phase transition, analysis of the PDOS spectra shows a rapid stiffening ofmore » the optical phonon modes and a dramatic increase of the Lamb-M¨ossbauer factor (fLM) and mean force constant which can be associated with the rapid decrease of the c axis and the anomalous expansion of the a axis. Theoretically calculated Fe partial PDOS and lattice parameters of SrFe2As2 further reveal the strong correlation between the lattice parameters and phonons. Our results show that the T-CT transition can induce significant changes in the vibrational, elastic, and thermodynamic properties of SrFe2As2 single crystal at high pressure.« less
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  • X-ray diffraction measurements on the sphalerite-derivatives ZnGa{sub 2}Se{sub 4} and CdGa{sub 2}S{sub 4} have been performed upon compression up to 23 GPa in a diamond-anvil cell. ZnGa{sub 2}Se{sub 4} exhibits a defect tetragonal stannite-type structure (I{bar 4}2m) up to 15.5 GPa and in the range from 15.5 to 18.5 GPa the low-pressure phase coexists with a high-pressure phase, which remains stable up to 23 GPa. In CdGa{sub 2}S{sub 4}, we find that the defect tetragonal chalcopyrite-type structure (I{bar 4}) is stable up to 17 GPa. Beyond this pressure a pressure-induced phase transition takes place. In both materials, the high-pressure phasemore » has been characterized as a defect-cubic NaCl-type structure (Fm{bar 3}m). The occurrence of the pressure-induced phase transitions is apparently related with an increase in the cation disorder on the semiconductors investigated. In addition, the results allow the evaluation of the axial compressibility and the determination of the equation of state for each compound. The obtained results are compared to those previously reported for isomorphic digallium sellenides. Finally, a systematic study of the pressure-induced phase transition in 23 different sphalerite-related ABX{sub 2} and AB{sub 2}X{sub 4} compounds indicates that the transition pressure increases as the ratio of the cationic radii and anionic radii of the compounds increases.« less