TY - JOUR
T1 - Structural studies on fluid sulfur at high temperatures and high pressures
T2 - I. Atomic dynamics investigated by inelastic x-ray scattering
AU - Inui, M.
AU - Kajihara, Y.
AU - Chiba, A.
AU - Matsuda, K.
AU - Tsutsui, S.
AU - Baron, A. Q.R.
N1 - Funding Information:
The authors would like to thank Japan Society for the Promotion of Science (JSPS) for a Grant-in-Aid for Scientific Research (A) (Grant No. 20244061). The synchrotron radiation experiments were performed at the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal numbers 2010A1184 and 2014B1143). The authors have no conflicts of interest directly relevant to the content of this article.
Funding Information:
The authors would like to thank Japan Society for the Promotion of Science (JSPS) for a Grant-in-Aid for Scientific Research (A) (Grant No. 20244061 ). The synchrotron radiation experiments were performed at the SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal numbers 2010A1184 and 2014B1143 ).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/10/15
Y1 - 2019/10/15
N2 - Inelastic x-ray scattering spectra of fluid S were measured from 403 K near the melting point to 1343 K in the supercritical region at 25 MPa. Although the dynamic structure factor in the supercritical region exhibits a single peak profile, the spectrum includes collective inelastic excitations besides the quasielastic component. The acoustic excitation energy in the supercritical region is close to the one predicted by the sound speed in the fluid consisting of S8 molecules and the observed excitation energies of the stretching modes in S molecules suggest that few fraction of S2 molecules in the supercritical region near the liquid-vapor critical point. This result indicates that the nearest neighbor coordination number in the supercritical fluid S obtained by x-ray diffraction [Inui et al., J. Phys. Conf. Ser. 98 (2008) 012008] was underestimated.
AB - Inelastic x-ray scattering spectra of fluid S were measured from 403 K near the melting point to 1343 K in the supercritical region at 25 MPa. Although the dynamic structure factor in the supercritical region exhibits a single peak profile, the spectrum includes collective inelastic excitations besides the quasielastic component. The acoustic excitation energy in the supercritical region is close to the one predicted by the sound speed in the fluid consisting of S8 molecules and the observed excitation energies of the stretching modes in S molecules suggest that few fraction of S2 molecules in the supercritical region near the liquid-vapor critical point. This result indicates that the nearest neighbor coordination number in the supercritical fluid S obtained by x-ray diffraction [Inui et al., J. Phys. Conf. Ser. 98 (2008) 012008] was underestimated.
KW - Atomic dynamics
KW - Fluid sulfur
KW - Inelastic x-ray scattering
KW - Molecular structure
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U2 - 10.1016/j.jnoncrysol.2019.119571
DO - 10.1016/j.jnoncrysol.2019.119571
M3 - Article
AN - SCOPUS:85070202265
SN - 0022-3093
VL - 522
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 119571
ER -