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Your search keyword '"Dharma Raj Basaula"' showing total 2 results
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2 results on '"Dharma Raj Basaula"'

1. The effect of TM doping on the superconducting properties of ZrNi2-xTMxGa (TM = Cu, Co) Heusler compounds

Author

Dharma Raj Basaula, Jeffrey Brock, and Mahmud Khan

Subjects
Physics, QC1-999
Abstract

We have explored the structural and superconducting properties of ZrNi2-xTMxGa (TM = Cu, Co) Heusler compounds via x-ray diffraction, scanning electron mi croscopy, electrical resistivity, dc magnetization and ac susceptibility measurements. All samples crystallized in the cubic L21 structure at room temperature. For x ≤ 0.25, all the ZrNi2-xCuxGa compounds showed superconducting properties and a decrease in TC with increasing Cu concentration. The dc magnetization data suggested type-II superconductivity for all the Cu-doped compounds. Contrary to the ZrNi2-xCuxGa compounds, no superconductivity was observed in the ZrNi2-xCoxGa compounds. Substitution of Ni by a small concentration of Co destroyed superconductivity in the Co-doped compounds. The experimental results are discussed and possible explanations are provided.

Published
2018
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2. Towards modeling thermoelectric properties of anisotropic polycrystalline materials

Author

John Mangeri, Serge Nakhmanson, Lukasz Kuna, Boris N. Feygelson, Mohamad Daeipour, and Dharma Raj Basaula

Subjects
History, Materials science, Polymers and Plastics, Mesoscale meteorology, Metals and Alloys, Thermoelectric materials, Engineering physics, Industrial and Manufacturing Engineering, Finite element method, Electronic, Optical and Magnetic Materials, Thermocouple, Thermoelectric effect, Benchmark (computing), Ceramics and Composites, Crystallite, Business and International Management, Anisotropy
Abstract

We report on the development of a finite element method based computational framework for evaluating thermoelectric properties of polycrystalline nanostructured materials and composites at mesoscale. This effort was advanced by formulation, testing and (if possible) validation of thermoelectric ‘benchmark problems,’ that progressed from simple to more advanced cases. The following benchmark problems were investigated: (a) effective Seebeck effect in a thermocouple, (b) Peltier heating and cooling at a single interface between two materials with different Seebeck coefficients, (c) coupled heat and electrical current transport through an anisotropic polycrystalline material. Excellent agreement with prior experimental or computational results was observed for the cases (a) and (b). The developed framework establishes the capabilities necessary to elucidate the workings of thermoelectric effects at the mesoscale level and could provide new opportunities for improvement of operational efficiency of nanoengineered thermoelectric materials and composites.

Published
2022

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