The Influence of Thermal Disorders on XAFS Debye-Waller Factor of Nickel
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The anharmonic X-ray absorption fine structure Debye-Waller factor of Nickel has been analyzed under the influence of thermal disorders. This Debye-Waller factor was calculated in explicit forms using the anharmonic correlated Debye model that developed from the correlated Debye model based on an anharmonic effective potential and the many-body perturbation approach. The thermodynamic parameters are derived from the influences on the absorbing and backscattering atoms caused by all their nearest neighbors in the crystal lattice with thermal vibrations. The numerical results of the Nickel in the temperature range from 0 to 800 K agree well with those obtained by the other theoretical models and experiments.
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