Abstract
In the present work, strontium-filled CoSb3 nanoparticles (SryCoSb3, y = 0, 0.025, 0.05, 0.075 and 0.1) were synthesized by a solvo-/hydrothermal method. Powder x-ray diffraction (pXRD) analysis reveals a cubic phase of CoSb3 with space group Im \( \bar{3} \). The Sr-filled samples show a slight peak shift and broadening of the high-intensity peak at 31.2491° corresponding to the (013) plane which can be attributed to the interaction of Sr atoms filled into voids of the CoSb3 cage-like structure with some of the lattice vibrations in the structure. Field emission scanning electron microscopy (FESEM) images show as-synthesized nanoparticles in the range of 50–160 nm, and energy-dispersive x-ray spectroscopy (EDX) analysis reveals the chemical composition of Sr-filled CoSb3. Fourier transform infrared spectroscopy (FTIR) studies confirm vibrational modes below 1000 cm−1 corresponding to Co-Sb and cobalt complexes in both filled and unfilled CoSb3 nanoparticles. UV–Vis absorption analysis indicates a peak shift towards the longer-wavelength region (redshift) and a decrease in the optical band gap as a function of the increase in Sr filling concentration. This can be considered strong evidence for successful filling of voids in the cage-like structure of CoSb3 by strontium.
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Acknowledgments
This work was supported by VGST GoK K-FIST (Level 1) under Grant No. VGST/GRD-552-/2016-17/2017-18. The authors would like to thank the Department of Chemistry and Department of Physics, B.M.S. College of Engineering for UV–visible absorption spectroscopy and FTIR measurement facilities, respectively. We extend our thanks to the Centre for Nano and Material Sciences, Jain University for the pXRD characterization facility under the NANOMISSION PROJECT “SR/NM/NS-20/2014” and DST-PURSE Laboratory, Mangalore University for providing the FESEM-EDX facility.
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Kumar, M.U., Swetha, R. & Kumari, L. Structural and Optical Studies on Strontium-Filled CoSb3 Nanoparticles Via a Solvo-/Hydrothermal Method. J. Electron. Mater. 50, 1735–1741 (2021). https://doi.org/10.1007/s11664-020-08629-2
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DOI: https://doi.org/10.1007/s11664-020-08629-2