Induced ferromagnetism and enhanced optical behaviour in indium-doped barium stannate system
Structural, morphological, optical and magnetic properties of chemically synthesized Indium-doped BaSnO3 (BSO) nanostructures were investigated. XRD results indicated cubic structure from Rietveld refinements and FT-IR studies confirmed the characteristic vibrations for all doped compounds. The presence of oxygen vacancies were derived from the defect-induced Raman modes. Surface morphological studies by HR-SEM showed a significant change from pseudo-cuboids to mixed rods. The presence of oxygen vacancies, oxidation states and elements (Ba, Sn, O and In) were studied by X-ray Photoelectron spectroscopy. UV–Vis and Photoluminescence studies demonstrated a decreasing tendency in bandgap values and the presence of defect states. Interesting defect sites and F-centres were probed by Electron paramagnetic resonance studies. A transition from diamagnetic to ferromagnetic behaviour observed from room temperature magnetic measurements was explained based on F-centre exchange interaction.
AM acknowledges the University of Madras for University Research Fellowship (URF). MM acknowledges the financial support by DST-SERB for National Post Doctoral Fellowship (PDF 2016/000372). Authors are grateful to Central Instrumentation Facility (CIF), University of Madras and UGC-DAE-CSR, Kalpakkam Node for various measurements.
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Conflict of interest
There is no conflict of interest in this article.
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