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Showing 1 to 7 of 7 for “"Lorenz number"”.
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Advancing the computational exploration for thermoelectric materials
… to search for materials with potentially low Lorenz number, which is the coefficient that relates κe to the electrical conductivity, σ. Although the Lorenz number is typically calculated assuming a single parabolic band, I showed that by theoretically driving a material’s energy dispersion …
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Nanoscale Thermal Fluctuation Spectroscopy
… contribution to thermal conductivity and Lorenz number from experimental data. Double validation of the experiment was accomplished through the use of a standard reference material and a standard measurement method, i.e. four-probe collinear resistivity technique. The advantages to this …
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Thermal conductivity in organic semiconducting polymers
… doped samples was quantitatively examined. The Lorenz number calculated using classic Wiedemann-Franz law was found to be much higher in doped polymers with relatively low electrical conductivity than the value for typical metals; however, this number would drop significantly at higher …
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First-principles investigation of transport and magnetism
… of TE properties in next chapter focusses on the Lorenz number where a certain widely used prescription for its approximation has been closely examined. Comparing against our first-principles based transport results on few well-known TEs as well as the ideal single parabolic band model, I found …
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Effect of solid solutions and second phases on the thermal conductivity of zirconium diboride ceramics
<p>"The research presented in this dissertation is focused on the thermal conductivity (k) of ZrB<sub>2</sub> ceramics. The goal was to develop a better understanding of how various solid solutions and second phases affect the thermal and electrical transport in ZrB<sub>2</sub>, with a focus on the …
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Thermoelectric Properties and Transport of Semicrystalline Conjugated Polymer and Single-Wall Carbon Nanotube Composites
… thermal conductivity and the Lorenz number. Subsequently, the charge densities of charge carriers in CNTs and PBTTT within the composites are characterised by the CAS. It is shown that the distribution of charge carriers depends on the network density of CNTs in composites and …
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Functional materials for thermal regulation
… an estimate of the temperature dependence of the Lorenz number L(T). The total thermal conductivity is dominated by electron contribution and varies between 13 W m-1 K-1 at x = 0.76 and 20 W m-1 K-1 at x = 1.00 for T = 300 K and between 25 and 35 W m-1 K-1 for T = 1000 K. The lattice thermal …