Gamma-irradiation induced modifications in structural and magnetic properties of nanocrystalline Mn0.5Zn0.5SmxFe2-xO4 ceramics

Anupama, A and Kumar, R and Choudhary, H K and Angadi, V Jagadeesha and Somashekarappa, H M and Rudraswamy, B and Sahoo, B (2020) Gamma-irradiation induced modifications in structural and magnetic properties of nanocrystalline Mn0.5Zn0.5SmxFe2-xO4 ceramics. In: RADIATION PHYSICS AND CHEMISTRY, 166 .

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Abstract

The changes in structure, infrared absorption and magnetic property of nanocrystalline Mn0.5Zn0.5SmxFe2-xO4 (x = 0.01, 0.03 and 0.05) ceramics were studied after different doses (0, 15 and 25 kGy) of gamma-irradiation. The samples were prepared by solution combustion route. We observed that up to the highest studied dose (25 kGy) of y-irradiation all the samples retain the cubic spinel (Fd-3m) structure as of the pristine samples, however, the lattice parameter decreases. Furthermore, we observed the metastability of Sm (and Mn) atoms at the octahedral sites. By Sm3+ doping the saturation magnetization of the pristine samples decreases, but the magnetic coercivity increases drastically, indicating enhancement of magnetic anisotropy. After gamma-irradiation the magnetic anisotropy vanishes completely and the sample behaves super-paramagnetically with a small variation in saturation magnetization. Our results are important to understand the behavior and stability of the magnetic hardness created by Sm3+ doping in soft magnetic Mn-Zn ferrite ceramics.

Item Type:	Journal Article
Publication:	RADIATION PHYSICS AND CHEMISTRY
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copyright of this article belongs to PERGAMON-ELSEVIER SCIENCE LTD
Keywords:	Sm doped Mn-Zn ferrite; High energy gamma-irradiation; Structure and magnetic properties; FTIR spectroscopy; Mossbauer spectroscopy
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	03 Feb 2020 07:21
Last Modified:	03 Feb 2020 07:21
URI:	http://eprints.iisc.ac.in/id/eprint/64241

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