International Journal of Advanced Materials Research
Articles Information
International Journal of Advanced Materials Research, Vol.2, No.4, Jul. 2016, Pub. Date: Jun. 1, 2016
Temperature Dependence of High-Order Expanded Anharmonic Correlated Debye Model Debye-Waller Factor of Metallic Copper
Pages: 52-58 Views: 712 Downloads: 443
Authors
[01] Nguyen Bao Trung, Department of Physics, College of Science, VNU-Hanoi. 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam.
[02] Nguyen Van Hung, Department of Physics, College of Science, VNU-Hanoi. 334 Nguyen Trai, Thanh Xuan, Hanoi, Vietnam.
[03] Ha Dang Khoa, School of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Vietnam.
Abstract
High-order expanded Debye-Waller factor presented in terms of cumulant expansion in X-ray Absorption Fine Structure (XAFS) of metallic copper, an fcc crystal, has been studied based on anharmonic correlated Debye model. Analytical expressions of dispersion relation, correlated Debye frequency and temperature and four first XAFS cumulants have been derived. Three-dimensional interaction is taken into account in the present one-dimensional model based on the anharmonic effective potential that includes contributions of near neighbors of absorber and backscattering atoms. Numerical results are compared to experiment and found to be in good agreement.
Keywords
High-Order XAFS Cumulants, Effective Potential, Correlated Debye Model, Metallic Copper
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