X-Ray Diffraction, Electron Paramagnetic Resonance and Optical Absorption Study of Bauxite

Autor:	Tanguturi Ravindra Reddy, Sanapa Lakshmi Reddy, Tamio Endo, Ovidio Almanza Montero, K. Thyagarajan
Rok vydání:	2014
Předmět:	Absorption spectroscopy Chemistry Analytical chemistry engineering.material law.invention Bauxite Transition metal law Impurity X-ray crystallography engineering Absorption (chemistry) Electron paramagnetic resonance Gibbsite
Zdroj:	Journal of Minerals and Materials Characterization and Engineering. :114-120
ISSN:	2327-4085 2327-4077
Popis:	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 Fe3+ has replaced Al3+ in the unit cell of bauxite. The optical absorption spectrum is due to Fe3+ 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9f3a7332c3022cc985a5a84a99f7edbb https://doi.org/10.4236/jmmce.2014.22015 Zobrazit plný text záznamu