Optical parameters and dispersion behavior of potassium magnesium chloride sulfate single crystals doped with Co+2 ions

A Abu El-Fadl; A M Abd-Elsalam

doi:10.1016/j.saa.2018.02.034

Optical parameters and dispersion behavior of potassium magnesium chloride sulfate single crystals doped with Co⁺² ions

Spectrochim Acta A Mol Biomol Spectrosc. 2018 May 5:196:367-374. doi: 10.1016/j.saa.2018.02.034. Epub 2018 Feb 15.

Authors

A Abu El-Fadl¹, A M Abd-Elsalam²

Affiliations

¹ Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt. Electronic address: abdelaziz.abdelaziz@science.au.edu.eg.
² Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt.

PMID: 29482153
DOI: 10.1016/j.saa.2018.02.034

Abstract

Single crystals of potassium magnesium chloride sulfate (KMCS) doped with cobalt ions were grown by slow cooling method. Powder XRD study confirmed the monoclinic structure of the grown crystals. The functional group vibrations were checked through FTIR spectroscopy measurements. In optical studies, the absorbance behavior of the crystals and their optical energy gap were established by Tauc plot. The refractive index, the extinction coefficient and other optical constants were calculated for the grown crystals. The normal dispersion of the refractive index was analyzed according to single oscillator Sellmeier's model. The Urbach's rule was applied to analyze the localized states density in the forbidden gap.

Keywords: Crystal growth; FTIR spectroscopy; KMCS single crystals; Optical properties; X-ray powder diffraction.