Anharmonic effective pair potentials of group VIII and lb fcc metals.
The temperature dependence of EXAFS Debye-Waller factors and anharmonic effective pair potentials of group VIII and Ib fcc metals were investigated by a cumulant expansion method. The EXAFS spectra near K- or L3-edges were measured at the temperatures from 30 to 800 K using synchrotron radiation from the Photon Factory, Tsukuba. The effective pair potentials, a x u2/2!+ b x u3/3! denote that the group Ib has obviously larger anharmonisity than the group VIII metals. The discrepancy between the Morse potential approximation and determined effective pair potential is discussed.
Okube
M
M
Department of Earth and Space Science, Graduate School of Science, Osaka University, Japan. makisan@ess.sci.osaka-u.ac.jp
Yoshiasa
A
A