Abstract
In this work, we report on the synthesis of Gd3+ substituted BiFeO3 nanoparticles and their structural, chemical, and magnetic characterizations. Single rhombohedral phase is obtained till x = 0.06 in Bi1-xGdxFeO3 nanoparticles, as confirmed by the Rietveld refinement of powder X-ray diffraction profiles. Beyond x = 0.06, a mixed phase consisting of both rhombohedral and orthorhombic structures is established. This kind of atom substitution-driven structural change is also confirmed by Raman spectroscopy. Core-level X-ray photoemission spectroscopy reveals the dominance of the Fe3+ oxidation state and also provides an estimation of oxygen vacancies which are found to be ~ 28% and 17% for x = 0.06 and 0.15 samples, respectively. The width of the hysteresis loop increases with the increase in Gd3+ concentration, suggesting an enhancement in magnetic character in contrast with pure BiFeO3 nanoparticles, and ferromagnetic contribution to the magnetization is estimated to a maximum value of 0.50 emu/g for x = 0.12.
Graphical Abstract
Highlights
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BixGd1-xFeO3 nanoparticles with x = 0.0, 0.03, 0.06, 0.10, 0.12 and 0.15 were synthesized by sol-gel method.
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Substitutional driven structural phase transformation from rhombohedral (R3c) to orthorhombic (Pnma) has been observed.
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Reduction in oxygen vacancies along with dominance of Fe3+ oxidation state has been observed.
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Partial suppression of spiral spin structure, surface effect in nanoparticles and DM interactions all together contributed for the observed weak ferromagnetic nature.
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Acknowledgements
The authors thank the CeNSE facility at the Indian Institute of Science, Bengaluru, India, for RAMAN, TEM, and XPS measurements. HP acknowledges the SVNIT Institute seed money grant 2021-22/DOP/04.
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MK conceptualized the idea supervised the work and edited the manuscript. SC performed experimental work and analysed the results. HP analysed the results and prepared the manuscript.
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Kumar, M., Chauhan, S. & Pandey, H. Effect of Gd3+ substitution on structural, morphological, and magnetic properties of BiFeO3 nanoparticles. J Sol-Gel Sci Technol 109, 272–282 (2024). https://doi.org/10.1007/s10971-023-06269-6
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DOI: https://doi.org/10.1007/s10971-023-06269-6