Abstract
ABSTRACT A series of novel lead-free tungsten bronze-structured Ba4(Dy2-xBix)Fe2Nb8O30 (x = 0, 0.05, 0.1, 0.15, 0.2 and 0.25) were formulated by the traditional high-temperature solid-state method using ball milling for 30 hrs and calcined at 1115°C. The structural property was investigated using X-ray diffraction and Fourier transform infrared spectroscopy. The tetragonal structure with the P4bm space group was confirmed from Rietveld analysis. The scanning electron micrograph shows a uniform distribution of different-shaped grains with less porosity. The UV-vis analysis shows that the materials have band gaps in the range of 2.45–2.51 eV which makes them useful for photocatalytic applications. From photoluminescence analysis, it is confirmed that the samples can be used as violate-/blue light-emitting diodes. The impedance of the materials falls off with the rise in temperature showing their negative temperature coefficient behaviour. The variation of polarization with an electric field confirms the ferroelectric nature of the samples.
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