Abstract
The reaction mechanism for the formation of Sr2SnO4 by solid-state reaction between SrCO3 and SnO2 has been investigated using thermal analysis (TG and DSC) combined with X-ray diffraction (XRD) techniques. It is observed that the formation of single-phase Sr2SnO4 takes place by reaction between SrO and SrSnO3 at temperatures ≥ 900 °C. Based on these studies, a few compositions of the system Sr2−xLaxSnO4 (x = 0.01, 0.02, 0.04, 0.06 and 0.10) have been synthesized by calcination at 1000 °C for 8 h. Rietveld refinement of the XRD data confirmed that all the synthesized samples have tetragonal structure, space group (I4/mmm) and symmetry group D 174h . The crystallite size and induced lattice strain has been calculated using size strain plot (SSP), varies from 30 to 50 nm and from (3.00 to 6.27) × 10−3, respectively. Raman and Fourier transformed infrared (FTIR) spectroscopy techniques have been utilized to ponder local changes in the structure of Sr2SnO4 with La incorporation. The optical properties of the samples have been studied using UV–Vis spectroscopy. The systematic shift in the position of the absorption edge (toward the higher wavelength) indicates the incorporation of La in the lattice of Sr2SnO4. The direct and indirect band gap of the samples calculated through Tauc’s plot. The variation in the value of direct band gap is attributed to changes in the charge compensation mechanism or/reduction in particle size.
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Acknowledgements
The authors are grateful to the Head Department of Physics and Coordinator, Central Instrument Facility Centre (CIFC), IIT(BHU), Varanasi, for providing the experimental facilities required for the characterization of the synthesized samples. One of the authors Mr. Upendra Kumar is thankful to the Ministry of Human Resource and Development (MHRD), Government of India, for financial support in terms of Senior Research Fellowship (SRF).
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Kumar, U., Yadav, D., Thakur, A.K. et al. Investigation on phase formation of Sr2SnO4 and effect of La-doping on its structural and optical properties. J Therm Anal Calorim 135, 1987–1999 (2019). https://doi.org/10.1007/s10973-018-7432-3
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DOI: https://doi.org/10.1007/s10973-018-7432-3