Item Details

Experimental and Modeling Study of Thermoelectric Materials for High Figure of Merit

Chen, Long
Format
Thesis/Dissertation; Online
Author
Chen, Long
Advisor
Poon, Joseph
Abstract
Half-Heusler alloys RNiSn (R=Hf, Zr, Ti) were made by arc melting under argon atmosphere followed by the consolidation using Spark Plasma Sintering (SPS) technique. The thermoelectric properties were measured from room temperature up to 1170 K. The temperature dependences of thermoelectric properties and structures were investigated. A frequency-dependent differential effective medium (DEM) model was developed to evaluate the lattice thermal conductivity. This model was also applied to calculate the thermal conductivity of nanostructured Si and Si80Ge20 systems. The calculation results were compared with the experimental data measured with time-domain thermoreflectance to investigate length scale effects on phonon wavelength, mean free path, as well as the resulting impact on the thermal conductivity.
Language
English
Date Received
20170127
Published
University of Virginia, Department of Physics, PHD (Doctor of Philosophy), 2017
Published Date
2017-03-26
Degree
PHD (Doctor of Philosophy)
Collection
Libra ETD Repository
Logo for In CopyrightIn Copyright

Availability

Read Online