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Showing 1 to 7 of 7 for “"phonon thermal conductivity"”.
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Phonon thermal transport in metallic glasses below 100 K
We have performed measurements of the phonon thermal conductivity of a variety of metallic glasses. In each case, the temperature dependence and magnitude of the phonon thermal conductivity of the glassy metal was very similar to that characteristic of nonmetallic glasses. We also performed …
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Influence of Structural Relaxation Upon the Low Temperature Properties of Metallic Glasses
… of metallic glasses. We find that below 1K, the thermal conductivity of metallic glasses (Fe(,40)Ni(,40)P(,14)B(,6), Pd(,77.5)Si(,16.5)Cu(,6) and Zr(,3)Rh) is similar to that of the large class of amorphous materials previously investigated, including other metallic glasses. We have analyzed the …
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Modeling the thermoelectric properties of bulk and nanocomposite thermoelectric materials
… In this thesis we introduce new models for phonon and electron transport in nanocomposites. For phonon modeling we develop an analytical formula for the phonon thermal conductivity using the effective medium approximation, while for electron modeling and more detailed phonon modeling we use …
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Nanoscale thermal transport for biological and physical applications
… opportunities and overcomes challenges for many thermal transport applications. Yet, it requires a more fundamental scientific understanding of nanoscale transport. This thesis emphasizes how simulation, mathematical, and numerical methods can lead to more grounded studies of nanoscale thermal …
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Thermal transport across transfer printed metal-dielectric interfaces: Influence of contact mechanics and nanoscale energy transport
Recent experiments suggest that the interfacial thermal conductance of transfer printed metal-dielectric interfaces is ~45 MW/m2K at 300K, approaching that of interfaces formed using physical vapor deposition. In this work, we investigate this anomalous result using a combination of theoretical …
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Thermal and thermoelectric properties of nanostructured materials and interfaces
… devices, solar cells, power electronics, thermal barrier coatings, and hard disk drives contain nanostructured materials where the thermal conductivity of the material is a critical parameter for the device performance. At the nanoscale, the mean free path and wavelength of heat carriers …
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One-Dimensional Quantum Magnets in Cuprates: Single Crystal Growth and Magnetic Heat Transport Studies
This experimental work focusses on the magnetic thermal conductivity, κ_mag, of the one-dimensional two-leg spin ladder system Sr_14Cu_24O_41 and the spin chain system SrCuO_2. These two S = 1/2 antiferromagnetic Heisenberg compounds possess enormous magnetic contributions to the heat transport …