Purple Coloured Natural Ruby: X-ray Photoelectron Spectroscopy, X-ray Diffraction, X-ray Tomography and Other Microstructural Characterizations
Keywords:
Purple Coloured Ruby, XRD, XPS, X-ray Micro CT, Inter-Valence Charge Transfer, Microstructure, Ti3 , Fe3 , Cr3 , UV-Vis Spectra.Abstract
Purple coloured natural ruby has been studied by surface sensitive tool like XPS supported by XRD, X-ray tomography (micro CT), FESEM, TEM and EDS. While XPS and EDS established the presence of transitional elements like Cr, Fe, Ti, the phases, morphologies and microstructures were studied by XRD, FESEM and TEM. X-ray micro CT provided non-destructive insights into the morpho-structural state of sample. UV-Vis and FTIR spectra of the ruby, recorded both in absorbance and reflectance mode, confirmed the occurrence of the above transitional elements contributing to typical colour display. Core level spectra of Cr, Fe, Ti, Al and O studied by XPS identified the ionic states of the elements.
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