Abstract
We synthesized Sm2−xDyxO3 (where X = 0.00, 0.03, 0.06, 0.09, and 0.12) nanoparticles using a co-precipitation method and investigated their structural and optical properties. X-ray diffraction (XRD) results reveal that Dy3+-do** in Sm2O3 nanoparticles leads to the formation of a monoclinic polymorphic phase along with the cubic phase of Sm2O3 and its fraction increases with increasing Dy3+-do** concentration. The substitution of Dy3+ at the Sm3+ site converts the cubic Sm2O3 unit cells into distorted monoclinic Sm2−XDyXO3 unit cells. The average crystallite and nanoparticle sizes decrease with increasing Dy3+-do** concentration. Dy3+-ions act as particle size inhibitors, which is attributed to an increase in the segregation of Dy3+-dopant ions at the surface of the nanoparticles with increasing Dy3+-do** content. The peak appearing at 851 cm−1 in the Fourier transform infrared spectroscopy (FTIR) spectra confirms the formation of Sm2O3. Widening of the band gap (Eg) above the band gap of pure cubic Sm2O3 with Dy3+-do** concentration has been observed for X > 0.06, which is due to the Moss-Burstein and quantum size effects.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We are grateful to the Central Instrumentation Laboratory (CIL) and Department of Physics, Central University of Punjab, Bathinda-151401 for providing the infrastructure and laboratory facilities.
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RS and AR: Conceptualization, Investigation, Formal analysis, Validation, Visualization, Writing of the original draft. AK, Anu, Deeksha, PK, RPS: Conceptualization, Investigation, Validation, Visualization, Writing—review and editing. KY: Supervision, Conceptualization, Investigation, Writing—review and editing, Validation, Visualization.
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Sain, R., Roy, A., Kumar, A. et al. Effects of Dy3+-do** on the band-gap widening and formation of mixed cubic and monoclinic phases of Sm2O3 nanoparticles. Appl. Phys. A 129, 804 (2023). https://doi.org/10.1007/s00339-023-07051-9
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DOI: https://doi.org/10.1007/s00339-023-07051-9