Abstract
Present study portrays physicochemical investigations of aliovalent rare earth ion Tb3+ substitution of ZnO composition series [Zn(1−x)TbxO NPs, where x = 0, 0.05, 0.10] synthesized by sol-gel route. Rietveld refinement of X-ray diffraction (XRD) profiles of all the compositions revealed that the synthesized NPs exhibit hexagonal wurtzite type crystallinity with space group P63mc without any secondary phases or impurities. TEM images confirmed the formation of nanoscale particles with average particle diameter of 14.65 ± 1.28 nm, 18.39 ± 0.56 nm, 22.13 ± 1.17 nm for x = 0, 0.05, and 0.10, respectively. A red shift was observed in the optical band gap with the doping of Tb3+ ion in a UV-visible study. FTIR spectra showed a bend located at 491 cm−1 belonging to Zn-O stretching vibration, which confirmed the formation of pure and modified ZnO NPs. Pristine ZnO NPs [x = 0] showed negative susceptibility and diamagnetic character, and for the composition x = 0.05, paramagnetic nature was observed. Whereas, room temperature ferromagnetism (RTFM) behavior was observed in Tb3+ modified ZnO NPs [x = 0.10] with the rise in magnetic saturation by increasing doping concentration. Dielectric analysis revealed an increase of the dielectric constant of ZnO NPs with Tb3+-doping due to the formation of oxygen vacancies. AC conductivity increases with increasing Tb3+ content in the composition.
Highlights
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All the compositions exhibit hexagonal wurtzite symmetry.
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Diamagnetic to ferromagnetic transition was observed due to Tb3+ doping in ZnO.
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The energy band gap decreases with the intrusion of Tb3+ ions in the ZnO crystal lattice.
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Dielectric permittivity decreases with increasing Tb3+ concentration.
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Acknowledgements
The authors are thankful to Head, Department of Physics, Chandigarh University, Mohali, India for providing laboratory facilities to carry out experimental work. NA is thankful to Department of Physics, Thapar University, Patiala, India for magnetic characterization. NK is grateful to SAIF, Lab, Panjab University, Chandigarh, India for providing characterization facility.
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Conceptualization: ST, Methodology: AS, Writing (Original draft): NA, Methodology: AV, Formal analysis and investigation: NKV, Writing (Review and editing): SJ, Co-supervision: SK, Resources for physicochemical characterization: GA, Supervision: NK, Dielectric investigation and analysis: RSP.
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Aggarwal, N., Jindal, S., Anand, G. et al. Magnetic metamorphosis of structurally enriched hexagonal Tb3+ modified ZnO nanoparticles. J Sol-Gel Sci Technol 103, 108–117 (2022). https://doi.org/10.1007/s10971-022-05811-2
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DOI: https://doi.org/10.1007/s10971-022-05811-2