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Inelastic x-ray scattering measurements of dynamical cross-over in liquid As2Se3 at high temperature and high pressure

  • M. InuiEmail author
  • Y. Kajihara
  • K. Matsuda
  • S. Hosokawa
  • K. Tamura
  • M. Yao
  • Y. Tsuchiya
  • D. Ishikawa
  • S. Tsutsui
  • A. Q. R. Baron
Regular Article

Abstract

Liquid As2Se3 undergoes the semiconductor-metal transition with increasing temperature when pressure is applied to avoid evaporation of the liquid. To investigate the atomic dynamics of liquid As2Se3, we have carried out inelastic x-ray scattering experiments of this system at 1073 K and 6 MPa and obtained the dynamic structure factor S(Q,E), from approximately 1.6 nm−1 to 11 nm−1, where Q and E are momentum and energy transfer, respectively. The excitation energy in the semiconducting state at 1073 K disperses as fast as the ultrasonic sound velocity at Q < 2.5 nm−1 but at Q > 2.9 nm−1 it disperses approximately 1.8 times faster. We analyzed S(Q,E) at 1073 K using a simple viscoelastic model and discussed Q dependence of the propagation of the acoustic mode.

Keywords

European Physical Journal Special Topic Central Peak Acoustic Mode Dynamic Structure Factor Atomic Dynamic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2011

Authors and Affiliations

  • M. Inui
    • 1
    Email author
  • Y. Kajihara
    • 1
  • K. Matsuda
    • 2
  • S. Hosokawa
    • 3
  • K. Tamura
    • 4
  • M. Yao
    • 2
  • Y. Tsuchiya
    • 5
  • D. Ishikawa
    • 6
  • S. Tsutsui
    • 6
  • A. Q. R. Baron
    • 7
    • 6
  1. 1.Graduate School of Integrated Arts and SciencesHiroshima UniversityHiroshimaJapan
  2. 2.Department of PhysicsKyoto UniversityKyotoJapan
  3. 3.Center for Materials Research Using Third-Generation Synchrotron Radiation FacilitiesHiroshima Institute of TechnologyHiroshimaJapan
  4. 4.Graduate School of EngineeringKyoto UniversityKyotoJapan
  5. 5.Faculty of ScienceNiigata UniversityNiigataJapan
  6. 6.SPring-8/JASRIHyogoJapan
  7. 7.RIKENHyogoJapan

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