Tunable magnetic and magnetocaloric properties of scandium doped Gd3Fe5-xScxO12 garnet compound

Authors

• Jolaikha Sultana, College of Arts & Sciences
• Jeotikanta Mohapatra, The University of Texas at Arlington
• Romakanta Bhattarai, School of Science
• J. Ping Liu, The University of Texas at Arlington
• Trevor David Rhone, School of Science
• Sanjay R. Mishra, College of Arts & Sciences

Abstract

This paper presents the tunable magnetic and magnetocaloric properties of Scandium-doped gadolinium iron garnets, Gd3 Fe5-xScxO12 (x = 0.0 to 0.25) compounds prepared by a facile auto-combustion method. The sample analyzed has a dominant cubic crystal structure (space group: Ia 3¯ d)) with a small fraction of an orthorhombic secondary phase, as determined by Rietveld analysis of X-ray diffraction patterns. The structural, magnetic, Mössbauer spectroscopy and first-principles density functional theory (DFT) studies show a preferential substitution of Sc³⁺ at the octahedral site of Fe³⁺ ions. The ferrimagnetic (FIM) transition is present in all samples, with the transition temperature decreasing from 560 K for × = 0.0 to 521 K for × = 0.25. The Sc³⁺ doped Gd3Fe4.75Sc0.25O12 exhibits an improved magnetocaloric effect (MCE) with a maximum magnetic entropy change (-ΔSM^max) 3.82 J kg^-1K⁻¹, and a higher relative cooling power (RCP) value of 408 J kg⁻¹, which is ∼ 7 % higher than the Gd3Fe5O12(380 J kg⁻¹) sample. These findings suggest that by incorporating Sc³⁺, the magnetic and magnetocaloric properties of Gd3Fe5-xScxO12 can be tailored for potential applications in low-temperature magnetic refrigeration.

Publication Title

Journal of Magnetism and Magnetic Materials

Recommended Citation

Sultana, J., Mohapatra, J., Bhattarai, R., Ping Liu, J., David Rhone, T., & Mishra, S. (2023). Tunable magnetic and magnetocaloric properties of scandium doped Gd3Fe5-xScxO12 garnet compound. Journal of Magnetism and Magnetic Materials, 585 https://doi.org/10.1016/j.jmmm.2023.171139