A M UMARJI
Articles written in Bulletin of Materials Science
Volume 20 Issue 7 October 1997 pp 1023-1028 Rapid Communication
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.
Volume 45 All articles Published: 12 July 2022 Article ID 0135
Microwave-assisted synthesis of reduced graphene oxide/V$_2$O$_5$ nano-composite as an efficient photocatalyst for dye degradation
DEVANSHI BHARDWAJ SAHIL SANGWAN S A SHIVASHANKAR A M UMARJI
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$_5$.
Volume 46, 2023
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
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