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Mechanism of gamma-irradiation induced phase transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 ceramics

Angadi, Jagadeesha V and Anupama, A V and Choudhary, Harish K and Kumar, R and Somashekarappa, H M and Mallappa, M and Rudraswamy, B and Sahoo, B (2017) Mechanism of gamma-irradiation induced phase transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 ceramics. In: JOURNAL OF SOLID STATE CHEMISTRY, 246 . pp. 119-124.

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Official URL: http://dx.doi.org/10.1016/j.jssc.2016.11.017

Abstract

The structural, infrared absorption and magnetic property transformations in nanocrystalline Mn0.5Zn0.5Fe2O4 samples irradiated with different doses (0, 15, 25 and 50 kGy) of gamma-irradiation were investigated in this work and a mechanism of phase transformation/decomposition is provided based on the metastable nature of the Mn-atoms in the spinel lattice. The nano-powder sample was prepared by solution combustion route and the pellets of the sample were exposed to gamma-radiation. Up to a dose of 25 kGy of gamma-radiation, the sample retained the single phase cubic spinel (Fd-3m) structure, but the disorder in the sample increased. On irradiating the sample with 50 kGy gamma-radiation, the spinel phase decomposed into new stable phases such as alpha-Fe2O3 and ZnFe2O4 phases along with amorphous MnO phase, leading to a change in the surface morphology of the sample. Along with the structural transformations the magnetic properties deteriorated due to breakage of the ferrimagnetic order with higher doses of gamma-irradiation. Our results are important for the understanding of the stability, durability and performance of the Mn-Zn ferrite based devices used in space applications.

Item Type: Journal Article
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Additional Information: Copy right for this article belongs to the ACADEMIC PRESS INC ELSEVIER SCIENCE, 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 28 Feb 2017 10:15
Last Modified: 28 Feb 2017 10:15
URI: http://eprints.iisc.ernet.in/id/eprint/56280

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