Author(s)

A. Abu El-Fadl^*, M. Almokhtar, A. M. Nashaat

Physics Department, Faculty of Science, Assiut University, Assiut, Egypt.

The transmittance (T) and the reflectance (R) were measured for (TMA)₂ZnCl₄ single crystals and hence the absorption coefficient (α), extinction coefficient (K_ex.), refractive index (n), real and im-aginary dielectric constants (ε', ε") of (TMA)2ZnCl4 crystals were calculated as a function of photon energy. The analysis of the spectra behavior of the absorption coefficient in the absorption region revealed indirect transition. The dispersion of the refractive index is discussed in terms of the sin-gle oscillator Wemple-DiDomenico model. The single oscillator energy (E₀), the dispersion energy (E_d), the lattice dielectric constant (ε_L) and the ratio of free charge carrier concentration to the ef-fective mass (N/m*) were estimated. The FTIR spectra were recorded to study the functional groups of the as grown and annealed samples.

(TMA)₂ZnCl₄ Single Crystals, Optical Band Gap, Refractive Index, Dispersion Parameters, FTIR Spectroscopy

El-Fadl, A. , Almokhtar, M. and Nashaat, A. (2015) Optical Characterization of (TMA)₂ZnCl₄ Single Crystals in the Normal Phase. Open Journal of Applied Sciences, 5, 169-181. doi: 10.4236/ojapps.2015.54017.