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X-Ray Diffraction, Electron Paramagnetic Resonance and Optical Absorption Study of Bauxite
Department of Physics, Sri Venkateswara Degree College, Kadapa, India
Department of Physics, Jawaharlal Nehru Technological University, College of Engineering, Pulivendla, India
Department of Physics, Universidad Nacional de Colombia, Bogota, Colombia
Department of Physics, Sri Venkateswara Degree College, Kadapa, India
Graduate School of Engineering, Mie University, Tsu, Mie, Japan
- 1 Department of Physics, Sri Venkateswara Degree College, Kadapa, India
- 2 Department of Physics, Jawaharlal Nehru Technological University, College of Engineering, Pulivendla, India
- 3 Department of Physics, Universidad Nacional de Colombia, Bogota, Colombia
- 4 Department of Physics, Sri Venkateswara Degree College, Kadapa, India
- 5 Graduate School of Engineering, Mie University, Tsu, Mie, Japan
Journal of Minerals and Materials Characterization and Engineering·Volume 02 (2014)·Pages 114–120·Published 14 March 2014·DOI10.4236/jmmce.2014.22015
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Abstract
The bauxite mineral obtained from Araku, Vishakapatnam district of Andhra Pradesh, India is used in the present work. Structural characterization was performed by X-ray diffraction (XRD). The mineral was found to be gibbsite in phase. The transitional metal ions present were investigated using electron paramagnetic resonance (EPR) and optical absorption spectra. The EPR results suggest that Fe 3+ has replaced Al 3+ in the unit cell of bauxite. The optical absorption spectrum is due to Fe 3+ which indicates that it is in distorted octahedral environment. The near-infrared (NIR) spectrum is due to water fundamentals and combination overtones, which confirm the formula of the compound. The impurities in the mineral are identified using spectroscopic techniques.
KeywordsBauxiteGibbsiteX-Ray Diffraction (XRD)Electron ParamagneticElectron Paramagnetic ResonanceOptical Absorption SpectraFe<sup>3+</sup>Water Fundamentals
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