Journal Menu
THERMODYNAMIC PARAMETERS DEPEND ON TEMPERATURE WITH THE INFLUENCE OF DOPING RATIO OF THE
Pages : [1] - [16]
Received : January 16, 2019; Revised February 7, 2019; Re-Revised February 11, 2019
Communicated by : Professor Dorina Simedru
Abstract
The effects of the doping ratio and temperature on the cumulants and thermodynamic parameters of alloys metals was investigated by using the anharmonic correlated Einstein model in extended x-ray absorption fine structure (EXAFS) spectra. The analytical expressions for the EXAFS cumulants and thermal expansion coefficient were derived. The parameters of the effective Morse potential and the Debye-Waller factor depend on temperature and the effects of the doping ratio were considered for pure copper (Cu-Cu), silver (Ag-Ag), zinc (Zn-Zn) and their alloys of CuAg, CuZn. The derived anharmonic effective potential includes the contributions of all the nearest neighbours of the absorbing and backscattering atoms, this accounts for three-dimensional interactions and the parameters of the Morse potential to describe single-bond pair atomic interactions. The numerical results of the EXAFS cumulants, thermodynamic parameters and anharmonic effective potential agree reasonably with experiments and other theories.
Keywords
brackpoint, cumulants, doping ratio, parameter, thermodynamic.