50 MeV, Li³⁺ ion induced modifications in Mössbauer signature and hyperfine interaction parameters of Y_3+xFe_5-xO₁₂ system

K. B. Modi¹ , J. A. Bhalodia² , P. Y. Raval³ , P. R. Pansara⁴ , K. B. Zankat⁵ , P. U. Sharma⁶

1. Department of Physics, Saurashtra University, Rajkot, India.
2. Department of Physics, Saurashtra University, Rajkot, India.
3. Department of Physics, Saurashtra University, Rajkot, India.
4. Department of Physics, Saurashtra University, Rajkot, India.
5. Government Science College, Sector 15, Gandhinagar, India.
6. M.N.College, Visnagar, India.

Correspondence should be addressed to: kunalbmodi2003@yahoo.com.

Section:Research Paper, Product Type: Isroset-Journal
Vol.6 , Issue.2 , pp.5-9, Apr-2018

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v6i2.59

Online published on Apr 30, 2018

Copyright © K. B. Modi, J. A. Bhalodia, P. Y. Raval, P. R. Pansara, K. B. Zankat , P. U. Sharma . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The consequences of swift heavy ion (SHI) irradiation (Li3+, 50 MeV, fluence = 5  1013 ions/cm2) on the Mössbauer signature and nuclear hyperfine interaction parameters of polycrystalline Y3+xFe5-xO12; x = 0.0, 0.2, 0.4 and 0.6 garnet system have been studied by means of 57Fe Mossbauer spectroscopy at 300 K. It is found that the formation of yttrium orthoferrite (YFeO3) phase for higher Y3+- concentration compositions can effectively be reversed by swift heavy ion irradiation. Mössbauer spectral analysis reveals the formation of central enhancement in the irradiated samples that indicates the formation of localized paramagnetic centers. Hyperfine parameters analysis throws light on the presence of two magnetic phases corresponding to the ferrimagnetic garnet phase and week ferromagnetic YFeO3 phase. The hyperfine interaction parameters of both the phases are highly influenced by SHII indicating a redistribution of cations and SHI induced formation of paramagnetic centers in the material.

Key-Words / Index Term :
yttrium iron garnet; swift heavy ion irradiation; Mossbauer spectroscopy

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