- Tytuł:
- Raman Scattering Characterization of $Mo_xW_{1-x}S_2$ Layered Mixed Crystals
- Autorzy:
- Sigiro, M.
- Powiązania:
- https://bibliotekanauki.pl/articles/1398311.pdf
- Data publikacji:
- 2017-02
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
Raman-active mode
layered mixed crystal
atomic displacement
chemical-vapor transport method - Opis:
- A series of $Mo_xW_{1-x}S_2$ (0 ≤ x ≤1) layered mixed crystals was grown by the chemical vapor transport method. A systematic study of these crystals was then conducted using the Raman scattering measurements. The peaks of the two dominant first-order Raman-active modes, $A_{1g}$ and $E_{2g}^1$, and of several second-order bands are observed from 150 cm¯¹ to 500 cm¯¹. The peaks corresponding to $A_{1g}$ mode show one-mode type behavior, whereas the peaks of $E_{2g}^1$ mode demonstrate two-mode type behavior for the entire series. These results can be explained by the atomic displacements of each mode. For $A_{1g}$ mode, only S atoms vibrate, thereby resulting in a one-mode type behavior for the mixed crystals. For $E_{2g}^1$ mode, metal and S atoms vibrate. The mass difference in the vibrating Mo and W cations causes the two-mode type behavior of $E_{2g}^1$ mode. In addition, the largest asymmetry and broadening of $A_{1g}$ mode for $Mo_{0.5}W_{0.5}S_2$ is attributed to random alloy scattering.
- Źródło:
-
Acta Physica Polonica A; 2017, 131, 2; 259-262
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł