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Nanostructured SnSe was created using hydrothermal methods and sintering in an evacuated-and-encapsulated ampoule. The effects of the synthesis and thermoelectric properties of SnSe using hydrothermal synthesis at low temperatures followed by evacuating-and-encapsulating sintering were then further investigated to determine their viability. One of the investigations centered around determining the thermal conductivities of the samples. The anisotropy of the thermal conductivity of the pressed polycrystalline SnSe was measured using the transient ...
Clathrates are thermoelectric materials that are used in waste heat recovery applications. This study tested the thermophysical properties of the n-doped clathrate Ba8Ga16Ge30 after gallium (Ga) and germanium (Ge) substituted antimony (Sb) and zinc (Zn). A TPS instrument measured the thermal conductivity of n-Ba8Ga16Ge30 with the transient plane source (TPS) method. Results showed that for almost every sample, thermal conductivity decreased inversely to temperature, then increased ...
Pristine and modified exfoliated graphite nanoplatelets (xGnPs and M-xGnPs, respectively) were dispersed into a paraffin wax phase change material (PCM) in an effort to raise the thermal conductivity of the PCM. The addition of pure xGnPs would decrease the electrical resistivity of the composite PCM, and thus its potential for use in electrical devices would be limited due to safety concerns. To eliminate this issue, the M-xGnPs were prepared. Samples ...
Bi2-xSbxTe3 thermoelectric materials, where x = 1.52 and 1.55 were prepared and evaluated for their thermoelectric properties. Three samples in total were prepared, two with x = 1.52 and 1.55 were synthesized at 140oC and one with x = 1.55 was synthesized at 160 oC. It was determined that the two samples synthesized at the higher temperature had lower resistivity than that which was synthesized at higher temperature. The figure of merit for the sample synthesized at 140oC, ...
Single phase, orthohombic structured Ca0.98Bi0.02Mn1−xSixO3−delta (x = 0.00, 0.02 and 0.03) samples were prepared using solid state reaction. The authors investigated whether they could improve the thermoelectric properties of the product by substituting calcium and manganese with bismuth and silicon, respectively. The resulting products had an increase in electrical resistivity and thermopower and a decrease in thermal conductivity as the amount of silicon added increased. Magnetic moments decreased in the ...
