Articles written in Bulletin of Materials Science
Volume 42 Issue 6 December 2019 Article ID 0269
Temperature-dependent transport properties of a FeTe parent compound have been investigated by measurements of electrical resistivity $\rho(T)$, thermal conductivity $\kappa(T)$ and Seebeck coefficient $S(T)$. The sample was synthesized using a standard solid state reaction route via vacuum encapsulation and characterized by X-ray diffraction spectroscopy,which indicated a tetragonal phase with the space group $P4/nmm$. The resistivity measurement data of the parent FeTe compound do not exhibit superconductivity however, it shows an anomaly in the temperature-dependent resistivity at around 67 K, which corresponds to structural phase transition in the vicinity of a magnetic phase transition. In the low temperature regime, Seebeck coefficient, $S(T)$, exhibited an anomalous dip feature and negative throughout the temperature range, indicating an electron-like, single band charge carrier mechanism. We have also estimated the power factor and thermoelectric figure of merit $ZT$, which is found to be significantly smaller than other compositions of iron chalcogenides.
Volume 46 All articles Published: 28 March 2023 Article ID 0066
Polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) blended polymeric membrane were prepared using solution casting method by embedding varying amount of titanium oxide (TiO$_2$) nanoparticles (NPs). X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and single gas permeation measurements were used to characterize the structural, thermal and permeation properties of the prepared membranes. Crystalline nature of the prepared membranes was confirmed by XRD pattern. FESEM confirmed the dispersion of TiO$_2$ NPs in the polymer matrix. In terms of PVA/PVP polymer and TiO$_2$ nanoparticle deposition, FT-IR confirms the molecular structure of membranes. TGA analysis revealed that the TiO$_2$ -loaded membranes were more thermally stable than the pure polymeric membrane. The influence of TiO$_2$ NPs on the gas permeability and the selectivity of the pure and mixed matrix membrane (MMMs) for H$_2$, N$_2$, O$_2$ and CH$_4$ gases was examined at room temperature with various feed pressure. Membrane permeability and the selectivity increased significantly with increasing the TiO$_2$ NPs concentration. With increasing the feed pressure, the permeability of the membranes reduced considerably while the selectivity improved slightly.
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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