Calculation of XAFS Cumulants for FCC Crystals Containing Impurity Atom
A new procedure for calculation and evaluation of XAFS cumulants of fee crystals containing impurity atom has been developed based on the quantum statistical theory with correlated Einstein model. Analytical expressions for the effective local force constants, correlated Einstein frequency and te...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
H. : ĐHQGHN
2017
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/VNU_123/57848 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | A new procedure for calculation and evaluation of XAFS cumulants of fee
crystals containing impurity atom has been developed based on the quantum
statistical theory with correlated Einstein model. Analytical expressions for the
effective local force constants, correlated Einstein frequency and temperature, first
cumulant or net thermal expansion, second cumulant or Debye Waller factor and
third cumulant of fee crystals containing impurity atom have been derived. Morse
potential parameters of pure crystals and those with impurity included in the derived
expressions have been calculated. Numerical results for Cu. Ni. Ni-Cu are found to be in good agreement with experiment |
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