A5038481567- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Magnetic and transport properties of perovskites and related materials
- Gas Sensing Nanomaterials and Sensors
- Thermal properties of materials
- Advanced Condensed Matter Physics
- Physics of Superconductivity and Magnetism
- Thermal Radiation and Cooling Technologies
- ZnO doping and properties
- Multiferroics and related materials
- Advanced Thermodynamics and Statistical Mechanics
- Heusler alloys: electronic and magnetic properties
- Superconductivity in MgB2 and Alloys
- Transition Metal Oxide Nanomaterials
- Ferroelectric and Piezoelectric Materials
- 2D Materials and Applications
- Glass properties and applications
- Analytical Chemistry and Sensors
- Quantum Dots Synthesis And Properties
- Iron-based superconductors research
- Advanced Semiconductor Detectors and Materials
- Pickering emulsions and particle stabilization
- Perovskite Materials and Applications
- Radioactive element chemistry and processing
- Bone Tissue Engineering Materials
Bhabha Atomic Research Centre
2015-2024
Homi Bhabha National Institute
2020-2024
SRM Institute of Science and Technology
2022
Indian Institute of Technology Bombay
2022
Bhabha Atomic Research Center Hospital
2008-2021
UGC DAE Consortium for Scientific Research
2016
Gujarat Vidyapith
2016
Barkatullah University
2002-2007
Institute of Physics, Bhubaneshwar
2007
Clemson University
1998
Silicon germanium alloys (Si80Ge20) have been used in thermoelectric generators for deep space missions to convert radioisotope heat into electricity. This work demonstrates the highest value of figure-of-merit (ZT) ∼1.84 at 1073 K n-type SiGe nanostructured bulk alloys, which is 34% higher than reported record alloys. The optimized samples exhibit a Seebeck coefficient ∼284 μV K−1, resistivity ∼45 μΩ m and thermal conductivity ∼0.93 W m−1 K−1 K. main contributing factor enhanced ZT very low...
The efficient conversion of heat into electricity using a thermoelectric approach requires high performance materials with the figure merit ZT ≥ 1. Here we report on bulk CuCrSe2, which exhibits very ∼ 1 at 773 K. titled compound an electrical resistivity ∼2.8 mΩ cm, Seebeck coefficient ∼160 μV K−1, together low thermal conductivity ∼7 mW cm−1 K−1 CuCrSe2 is attributed to phonon scattering by various sources such as (i) superionic Cu ions between CrSe2 layers, (ii) nanoscale precipitates in...
Recent studies have shown that thermoelectric materials exhibit a high figure-of-merit if it consists of hierarchically organized microstructures significantly lower the lattice thermal conductivity without any appreciable change in power factor. Here, we report new class (AgCrSe2)0.5(CuCrSe2)0.5 nano-composites synthesized via vacuum hot pressing mixture constituents, which naturally phonon scattering centers multiscale hierarchical fashion, i.e. atomic scale disorder, nanoscale amorphous...
The origin of the buckling micrometer-sized colloidal droplets during evaporation-induced self-assembly (EISA) has been elucidated using electron microscopy and small-angle neutron scattering. Doughnut-like assembled grains with varying aspect ratios are formed EISA at different physicochemical conditions. It revealed that this phenomenon is better explained by an existing hypothesis based on formation a viscoelastic shell nanoparticles drying than other hypotheses inertial instability...
Diffusion bonded very low resistance electrical contacts (specific contact <10 µΩ cm2) have been developed on n-type PbTe and p-type TAGS-85 ((AgSbTe2)0.15(GeTe)0.85) thermoelements. Thermoelectric devices (TEDs) having two p–n couples in series (each of four elements 7.5 mm diameter) generated an output power 1.2 W (at operating current ~17 A) at hot side temperature Th = 500 °C a difference ΔT 410 °C. Internal the was found to increase linearly with number The efficiency TEDs be 6%....
Nanocomposite microcapsules of silica and surfactants have been synthesized using evaporation induced self-assembly through spray drying. It was established electron microscopy small-angle neutron/X-ray scattering experiments that the viscosity virgin dispersion surface charge colloidal components play a significant role in buckling droplets during Hollow spherical grains are realized at relatively low higher while mushroom like manifest lower charge. In intermediate conditions, deformed...
The majority of industrial, automobile processes, electrical appliances emit waste heat in the low-temperature range (<573 K), hence efficient thermoelectric materials operating this are highly needed. Bismuth telluride (Bi2Te3) based alloys conventional material for application. pure Bi2Te3 sample synthesized work exhibits n-type conduction. We demonstrate that by small doping Pb at Bi site a transition transport form n- to p-type is observed. figure-of-merit (ZT) ~0.47 and optimized...
Understanding the role of various physicochemical parameters is essential in order to control microstructure during evaporation induced self-assembly drying colloidal droplets. In present work, effect particle size and its distribution on formation spherical doughnut shaped hollow microcapsules rapid droplets has been elucidated. It demonstrated that with substantial shell thickness are formed for small low polydispersity nanoparticles a virgin dispersion. A few such microcapsules, even...
Among the various oxide thermoelectric materials, double perovskites provide more flexibility to maneuver interdependent parameters achieve enhanced figure of merit (ZT), as octahedral ordering, i.e., arrangement ${B}^{\ensuremath{'}}{\mathrm{O}}_{6}$ and ${B}^{\ensuremath{''}}{\mathrm{O}}_{6}$ octahedra, present in ${A}_{2}{B}^{\ensuremath{'}}{B}^{\ensuremath{''}}{\mathrm{O}}_{6}$ structure is impacted by cation doping. In this work, we investigated role distortion on properties...
The synergistic effect of decoupled thermoelectric parameters on the enhanced power output a unicouple TEG.
Flexible thin films of mixed ion–electron conductor Ag2Se are an attractive candidate for wearable thermoelectric applications near room temperature. In this work, deposition Se/Ag2Se1−δ bi-layers by simple thermal evaporation followed annealing enhances the Se content in Ag2Se1−δ films. The enrichment resulted improvement power factor through improved texturing and enhanced Seebeck coefficient due to reduced carrier concentration. Films with Se/Ag ratio ∼0.5 showed highest ∼22 μW cm–1 K–2...
Vanadium metal is extensively used in modern technology, especially the alloy and steel industry; it exhibits anomalous thermal expansion behavior across entire temperature regime. Here, we investigate phonon anharmonicity contributed by volume change (implicit anharmonicity) amplitude (explicit their impact on transport vanadium up to 2000 K, close melting temperature. We compared different methods evaluate anharmonicity, namely, quasiharmonic approximation (QHA), temperature-dependent...
One-dimensional tellurium nanostructures have been prepared by thermal evaporation in a tubular furnace under argon gas flow at pressure of 1 atm. The depositions were found to occur along the length quartz tube with microrods deposited higher temperatures (350–400 °C) and nanotubes lower (<200 °C). It was observed that growth is initiated nucleation spherical particles followed one-dimensional structures. Possible mechanisms for these effect source temperature on structures obtained are discussed.