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Structural stability improvement, Williamson Hall analysis and band-gap tailoring through A-site Sr doping in rare earth based double perovskite La2NiMnO6

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Abstract

The structural, morphological and optical properties of single-phase polycrystalline La2−xSrxNiMnO6 (x = 0, 0.3 and 0.5), synthesized by solid state reaction were investigated. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy dispersive analysis of X-rays (EDAX), Raman spectroscopy and diffuse reflectance spectroscopy (DRS) to elucidate the role of A-site Sr-doping in double perovskite La2NiMnO6. Rietveld analysis of XRD patterns revealed that all the samples have monoclinic structure with space group P21/n. Positive gradient in the Williamson Hall plots revealed the presence of tensile strain in all the samples. The morphological studies revealed that average grain size increases along with appreciable decrease in porosity with Sr doping. The Ni/Mn antisite disorder was introduced in the La2NiMnO6 by Sr-doping confirmed by an increase in the full width at half maximum (FWHM) and decrease in intensity of the Raman modes at around 540 and 665 cm−1 which correspond to the antisymmetric stretching and symmetric stretching modes, respectively. DRS results reveal that the band gap in La2NiMnO6 can be tuned down by Sr-doping to a value of 1.37 eV (very close to 1.40 eV, considered as optimum value for better efficiency of a solar cell). Thus, Sr-doped La2NiMnO6 may be of prime importance for applications in solar cells.

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Acknowledgements

We gratefully acknowledge the full support from our Institute, National Institute of Technology Srinagar. We are also thankful to Dr. K Asokan, Dr. Saif A Khan, senior scientists at IUAC New Delhi, Dr. Shahnaz Majeed (Senr. Lecturer, UniKL RCMP Malaysia), Dr. Khalid Sultan (Asst. Prof. CUK), Dr Rubiya Samad (WoS-A at Univ. of Kashmir) and Dr. Sheeraz A. Bhat (PDF at NIT Srinagar) for their valuable suggestions in the development of this manuscript. The author, Shah Aarif Ul Islam is thankful to Ministry of Human Resource Development (MHRD) India, for the financial support.

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  1. Solid State Research Laboratory, Department of Physics, National Institute of Technology, Srinagar, J&K, 190006, India

    Shah Aarif Ul Islam & Mohd Ikram

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Aarif Ul Islam, S., Ikram, M. Structural stability improvement, Williamson Hall analysis and band-gap tailoring through A-site Sr doping in rare earth based double perovskite La2NiMnO6. Rare Met. 38, 805–813 (2019). https://doi.org/10.1007/s12598-019-01207-4

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  • DOI: https://doi.org/10.1007/s12598-019-01207-4

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