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Vol. 36 No. 11 (2024): Vol 36 Issue 11, 2024

Copyright (c) 2024 Reshmi C P, RAMESH A. R.

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Structure, Optical Properties and Magnetocaloric Effects in Gd3Fe5O12 Garnet Synthesized by Solid State Method

https://doi.org/10.14233/ajchem.2024.32663
C.P. Reshmi
Department of Chemistry, Government Victoria College, Research Center under University of Calicut, Palakkad-678001, India
https://orcid.org/0009-0001-8599-6104
A.R. Ramesh
Department of Chemistry, Government Victoria College, Research Center under University of Calicut, Palakkad-678001, India
https://orcid.org/0000-0003-4960-9979

Corresponding Author(s) : A.R. Ramesh

aroramesh@gvc.ac.in

Asian Journal of Chemistry, Vol. 36 No. 11 (2024): Vol 36 Issue 11, 2024

Abstract

In this work, gadolinium iron garnet (Gd3Fe5O12) was synthesized using the solid-state ceramic method. The structural analysis, confirmed through Rietveld refinement, indicated the formation of a single-phase garnet structure. Scanning electron microscopy studies revealed uniform grain size and homogeneity in the sintered material, while UV-vis absorption studies showed a peak at 300 nm, indicating strong ultraviolet interaction and an optical band gap of 3.64 eV, suggesting optoelectronic potential. The fluorescence emission spectrum shows a band at 435 nm, while the excitation spectrum exhibits bands at 275 and 360 nm. The magnetic measurements demonstrated Gd ion ordering at low temperatures, with a compensation temperature around 290 K. Arrott plots confirmed the second-order magnetic phase transition. Importantly, Gd3Fe5O12 exhibited both normal and inverse magnetocaloric effects, with a maximum magnetic entropy change of 1.05 J kg–1 K–1 at 230 K under 9 T magnetic field. These properties indicate Gd3Fe5O12 material as a promising candidate for magnetic refrigeration and optoelectronic applications.

Keywords

Gadolinium iron garnet Magnetocaloric effect Compensation temperature Rietveld refinement Arrott plot
Reshmi, C., & Ramesh, A. (2024). Structure, Optical Properties and Magnetocaloric Effects in Gd3Fe5O12 Garnet Synthesized by Solid State Method. Asian Journal of Chemistry, 36(11), 2640–2646. https://doi.org/10.14233/ajchem.2024.32663
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