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XRD, internal field-NMR and Mossbauer spectroscopy study of composition, structure and magnetic properties of iron oxide phases in iron ores

Manjunatha, Mushtagatte and Kumar, Rajeev and Anupama, Aroli V and Khopkar, Vijay B and Damle, Ramakrishna and Ramesh, Karalapura P and Sahoo, Balaram (2019) XRD, internal field-NMR and Mossbauer spectroscopy study of composition, structure and magnetic properties of iron oxide phases in iron ores. In: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 8 (2). pp. 2192-2200.

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Official URL: http://dx.doi.org/10.1016/j.jmrt.2019.01.022


We report the phase-composition, structure and magnetic properties of two representative samples of naturally available iron-oxide containing ores/soils collected from two different regions in Karnataka, India. Presence of elements such as Fe, Si, Al and O were identified in both the samples using energy dispersive analysis of X-rays (EDAX). X-ray diffraction results confirmed that different ceramic phases such as crystalline iron oxide phases (Fe3O4, gamma-Fe2O3 and alpha-Fe2O3), aluminosilicates (Al2SiO5) and low-quartz (SiO2) phases constitute the soil. The presence of ferrimagnetic phases (Fe3O4, gamma-Fe2O3) makes the soil respond to a permanent magnet. Separation between the magnetic and non-magnetic phases was performed using a permanent magnet. The non-magnetic part of the sample contains a high amount of alpha-Fe2O3 phase along with aluminosilicates and low-quartz. The magnetic phases were further characterized and quantified. The presence of Fe3O4 phase in the samples was confirmed from the Verwey transition observed by internal-field NMR spectroscopy. Our results demonstrate that internal-field NMR and Mossbauer spectroscopy are complementary tools for characterizing iron containing soils. Furthermore, we found that the soil collected from the low temperature region (Sandur) contains more amounts of ferrimagnetic oxide (Fe3O4, gamma-Fe2O3) phases, whereas the high temperature region (Hospete) contains more alpha-Fe2O3 phase. Hence, our results confirm that the phase composition of the soil is intimately related to the local daily temperature. (C) 2019 The Authors. Published by Elsevier B.V.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to ELSEVIER SCIENCE BV
Keywords: Iron ores; Phase composition; Magnetic properties; Internal field NMR; Mossbauer spectroscopy
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 26 Jun 2019 17:25
Last Modified: 26 Jun 2019 17:25
URI: http://eprints.iisc.ac.in/id/eprint/63083

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