NGHIÊN CỨU HIỆU ỨNG TƯƠNG QUAN PHI ĐIỀU HÒA BẰNG MÔ HÌNH DEBYE TRONG PHỔ CẤU TRÚC TINH TẾ HẤP THỤ TIA X–ÁP DỤNG ĐỐI VỚI HỢP KIM HAI THÀNH PHẦN
The displacement correlation function in extended X-ray absorption fine structure spectra has been determined based on the Debye-Waller factor. The anharmonic correlated Debye model and the harmonic Debye model have been used to build analytical expressions of mean square displacement, mean square r...
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| Główni autorzy: | , , , , , |
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| Format: | Artykuł |
| Język: | Vietnamese |
| Wydane: |
Trường Đại học Đà Lạt
2023
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| Dostęp online: | https://scholar.dlu.edu.vn/thuvienso/handle/DLU123456789/114372 https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/732 |
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| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
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| Streszczenie: | The displacement correlation function in extended X-ray absorption fine structure spectra has been determined based on the Debye-Waller factor. The anharmonic correlated Debye model and the harmonic Debye model have been used to build analytical expressions of mean square displacement, mean square relative displacement, and correlation function dependence on temperature and doping ratio. The thermodynamic quantities have been calculated based on the effective anharmonic potential, including the interaction of absorbing and scattering atoms with their nearest neighbors in an atom cluster. The analytical expressions have been applied to face-centered cubic crystals and their alloys. Numerical results for crystalline copper (Cu) and copper-silver alloys (CuAg) of 72% and 50% ratios agree well with experimental values and other studies. The study has contributed to our knowledge of the thermodynamic properties of 50:50 CuAg doped alloy at low temperatures. |
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