Abu El-Fadl A, Abd-Elsalam A M
Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt.
Department of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 May 5;196:367-374. doi: 10.1016/j.saa.2018.02.034. Epub 2018 Feb 15.
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.
采用缓慢冷却法生长了掺杂钴离子的硫酸钾镁氯（KMCS）单晶。粉末X射线衍射研究证实了所生长晶体的单斜结构。通过傅里叶变换红外光谱测量检查了官能团振动。在光学研究中，通过Tauc图确定了晶体的吸光度行为及其光学能隙。计算了所生长晶体的折射率、消光系数和其他光学常数。根据单振子Sellmeier模型分析了折射率的正常色散。应用乌尔巴赫规则分析了禁带中的局域态密度。
