Pressure Dependence of Effective Pair Potentials in AgBr Determined by Extended X-Ray Absorption Fine Structure

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概要

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• The pressure dependence of extended X-ray absorption fine structure (EXAFS) Debye-Waller factors in AgBr has been investigated using the cumulant expansion method. The Br K-edge EXAFS spectra were measured in the transmission mode under high pressure (${\leq}9.1$ GPa) at room temperature using a cubic anvil type apparatus (MAX90) and synchrotron radiation from the Photon Factory, Tsukuba. The effective pair potentials, $V(u)=\mbi{a}u^2/2+\mbi{b}u^3/3!$, were evaluated and the potential coefficient $\mbi{a}$ at 2.1, 4.2 and 6.1 GPa are 1.59(4), 1.75(4) and 1.91(4) eV/\AA-2, respectively. The energies of the third-order anharmonic potential coefficient $\mbi{b}$ maintain nearly constant values with pressure though the third-order cumulant $\sigma_3$ decreases with increasing in pressure.

• Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
• 2001-04-15

著者

• Nagai Takaya

  Department Earth And Space Science Graduate School Of Science Osaka University

• Yoshiasa Akira

  Department Earth And Space Science Graduate School Of Science Osaka University

• Murai Kei-ichiro

  Department Of Chemical Science And Technology Graduate School Of Advanced Technology And Science The

• Katayama Yoshinori

  Department Of Pediatrics & Neonatology Takatsuki General Hospital

• Yoshiasa Akira

  Department Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan

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