A5089557393- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Magnetic Properties of Alloys
- Advanced Condensed Matter Physics
- Thermal properties of materials
- Shape Memory Alloy Transformations
- Thermal Radiation and Cooling Technologies
- Topological Materials and Phenomena
- Heusler alloys: electronic and magnetic properties
- Quantum Dots Synthesis And Properties
- Thermal Expansion and Ionic Conductivity
- Copper-based nanomaterials and applications
- Ammonia Synthesis and Nitrogen Reduction
- Perfectionism, Procrastination, Anxiety Studies
- Iron-based superconductors research
- Semiconductor materials and interfaces
- ZnO doping and properties
- Metal and Thin Film Mechanics
- Metal-Organic Frameworks: Synthesis and Applications
- 2D Materials and Applications
- Hydrogen Storage and Materials
- Gas Sensing Nanomaterials and Sensors
- Intermetallics and Advanced Alloy Properties
Indian Institute of Technology Mandi
2017-2024
Thinfilm (Sweden)
2023-2024
Linköping University
2023-2024
Uppsala University
2024
Rensselaer Polytechnic Institute
2019
Maulana Azad National Institute of Technology
2019
Sigma Research (United States)
2018
Council of Scientific and Industrial Research
2014-2016
National Physical Laboratory
2015-2016
Ames National Laboratory
2008-2014
Ordering up better conductivity Improving a thermoelectric material's ability to convert heat electricity involves optimizing one property without changing another in detrimental way. Roychowdhury et al. found that cadmium doping of silver antimony telluride enhances cationic ordering, which simultaneously improves electric properties and helpfully decreases thermal (see the Perspective by Liu Ibáñez). This strategy markedly could be used for other materials. Science , this issue p. 722 ;...
For the first time a metal hydride has been used for preparation of metal–organic framework. MIL-78 synthesized by solid-state mechanochemical reaction between yttrium and trimesic acid. The process does not involve solvents generate liquid by-products, thus proving viability approach to synthesis MOFs.
A substantial enhancement in <italic>ZT</italic> ∼ 1.2 at 900 °C has been realized p-type nanostructured Si<sub>80</sub>Ge<sub>20</sub> alloys by creating nano-to-meso scale defect features.
Abstract Flexible thermoelectric devices of nanomaterials have shown a great potential for applications in wearable to remotely located electronics with desired shapes and geometries. Continuous powering up the low power flexible is major challenge. We are reporting module prepared from silver telluride (Ag 2 Te) nanowires (NWs), which chemically transformed uniquely synthesized scalable tellurium (Te) NWs. Conducting Ag Te NWs composites an ultralow total thermal conductivity ~0.22 W/mK...
We report the synthesis of thermoelectric compounds, Cu3SbSe3 and Cu3SbSe4, employing conventional fusion method followed by spark plasma sintering. Their properties indicated that despite its higher thermal conductivity, Cu3SbSe4 exhibited a much larger value figure-of-merit as compared to Cu3SbSe3, which is primarily due electrical conductivity. The compatibility factor was found be ∼1.2 0.2 V−1 for at 550 K. results mechanical these two compounds their microhardness fracture toughness...
Electronic band structure and partial density of states for <italic>Cmcm</italic> phase SnSe.
For applications in energy harvesting and environmentally friendly cooling, for power sources remote or portable applications, it is desired to enhance the efficiency of thermoelectric materials. One strategy consists reducing thermal conductivity while increasing retaining factor. An approach achieve this doping Seebeck coefficient electrical conductivity, simultaneously introducing defects materials increase phonon scattering. Here, we use Mg ion implantation induce epitaxial ScN (111)...
We report on structure, vibrational properties and weak-antilocalization-(WAL-) induced quantum correction to magnetoconductivity in single crystal Bi2GeTe4. Surface band structure calculations show a Dirac cone corresponding topological surface states An estimated phase coherence length, l_{\phi} ~ 143 nm prefactor {\alpha} - 1.54 from Hikami-Larkin-Nagaoka fitting of describe the conductivity. anomalous temperature dependence A1g Raman modes confirms enhanced electron-phonon interactions....
Large unit cell copper-chalcogenide based minerals with high crystalline anharmonicity have a potential for thermoelectric applications owing to their inherent poor lattice thermal conductivity. Here, the softening of copper-selenium bonding and hence crystal framework plays an important role in superionic conduction We studied Cu26Nb2Sn6Se32, Cu26Nb2Sn6Se31.5 Cu26Nb2Sn6Se30Te2 strategically tailored anionic disorders. These compounds p-type degenerate behavior carrier concentration ranging...
Abstract Flexible thermoelectric devices of nanomaterials have shown a great potential for applications in wearable to remotely located electronics with desired shapes and geometries. Continuous powering up the low power flexible is major challenge. We are reporting module prepared from silver telluride (Ag 2 Te) nanowires (NWs), which chemically transformed uniquely synthesized scalable tellurium (Te) NWs. Conducting Ag Te NWs composites an ultralow total thermal conductivity ~0.22 W/mK...
Magnetic, magnetocaloric, and magnetoresistance studies have been carried out on polycrystalline samples of Laves phase compounds $\mathrm{Ho}{({\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})}_{2}$ [$x=0$, 0.05, 0.1]. The magnetocaloric effect in $\mathrm{Ho}{\mathrm{Ni}}_{2}$ is found to be maximum near the ordering temperature with values...
ScN-rich (Sc,Nb)N solid solution thin films have been studied, motivated by the promising thermoelectric properties of ScN-based materials. Cubic Sc1-xNbxN for 0 ≤ x 0.25 were epitaxially grown DC reactive magnetron sputtering on a c-plane sapphire substrate and oriented along (111) orientation. The crystal structure, morphology, thermal conductivity, electrical investigated. ScN reference film exhibited Seebeck coefficient −45 μV/K power factor 6 × 10−4 W/m K2 at 750 K. Estimated from room...
The effect of external pressure on the magnetic properties and magnetocaloric polycrystalline compounds DyCo2 Er(Co1−xSix)2 (x = 0,0.025 0.05) has been studied. ordering temperatures both parent Si-substituted are found to decrease with pressure. In all compounds, critical field for metamagnetic transition increases It is seen that in almost insensitive pressure, while there considerable enhancement case compounds. Spin fluctuations arising from magnetovolume play a crucial role determining...
Anharmonicity related to crystal structures strongly affects the phonon propagation and reduces lattice thermal conductivity (κl). Associated with a higher order of anharmonicity, thermoelectric (TE) materials large Grüneisen parameter (γ) possess ultralow (κtotal), which plays decisive role in engineering their TE performances. We report on structural transport properties layered Bi2GeTe4, belongs Bi2Te3 family albeit larger unit cell. Bi2GeTe4 shows electron dominated metallic nature...
Anisotropy of light-matter interactions in materials gives remarkable information about phonons and their with electrons. We report angle-resolved polarization Raman spectroscopy single crystal ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ to obtain elements tensor for understanding strength along different crystallographic orientations. Intensity variation polar plots corresponding ${E}_{g}^{1} \ensuremath{\sim}37\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}1}, {A}_{1g}^{1}...