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Thermal expansion studies on ferroelectric materials
Thermal expansion data is reported over a wide temperature range (80–800 K) for BaTiO3 (BT) and Pb(Fe1/2 Nb1/2)O3 (PFN), belonging to different classes of the ferroelectric materials. The sharp structural phase transitions of BT result in lowering of the thermal expansion coefficient (α) at the transitions which is proportional to the change in polarization at the transitions. In PFN, a relaxor ferroelectric, lowering of α is spread over a wider temperature range across the dielectric maxima.
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In the present study, rapid and green microwave synthesis has been used to synthesize V$_2$O$_5$ and reduced graphene oxide decorated with V$_2$O$_5$, a hybrid nanocomposite (rGO/V$_2$O$_5$), using an inorganic precursor. The synthesized nanocomposite is characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and UV–visible spectroscopy. The photocatalytic activity of V$_2$O$_5$and rGO/V$_2$O$_5$ was studied by degrading methylene blue dye in sunlight. The kinetics of the dye degradation is studied by calculating the rate constant and the half-life of the degradation process. The rGO/V$_2$O$_5$ nanocomposite showed low resistance, thus increasing the diffusion of electrons, which prevents electron–hole recombination and hence enhances photocatalytic activity (80% degradation efficiency) when compared with bare V$_2$O$_5$.
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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode