High Pressure Sintering of Nano-polycrystalline Thermoelectric Materials

Toda, Naohiro; Takashi, Harada; Sumiya, Hitoshi

doi:10.4131/jshpreview.15.310

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2010

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“…Thermal conductivities of ZnO, CoSb 3 , and Bi 2 Te 3 are reported to be reduced, with a notable increase in the ZT values. 13 As well as the LAST-m compounds, the evolution of nanostructure in bulk thermoelectrics has recently been observed in several other systems. 14 One example is recent studies on Na 1-x Pb m Sb y Te 2+m , which show high thermoelectric figure of merit due to nanostructuring effects.…”

Section: Introductionmentioning

confidence: 98%

Structural Phase Transitions and Thermoelectric Properties of AgPb18SbTe20 Under Compression

Kumar

Balasubramanian

Jacobsen

et al. 2010

Journal of Elec Materi

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The high-figure-of-merit thermoelectric material AgPb 18 SbTe 20 has been investigated by in situ angular-dispersive x-ray diffraction (XRD) and x-ray absorption fine-structure (XAFS) measurements up to 30 GPa. Resistivity and thermopower were measured with Bridgman-type opposed metal anvil cells. The results show that the ambient cubic Fm3m À Á structure transforms to orthorhombic (Pnma) at 6.4 GPa and then to the CsCl-type Pm3m À Á structure at 15 GPa. The ambient cubic Fm3m À Á phase is found to be recoverable on releasing the pressure. The thermoelectric power is found to increase with pressure for the cubic phase. The XAFS studies performed at the Pb L 3 -edge and Ag K-edge along with resistivity studies complement the XRD findings.

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Section: Introductionmentioning

confidence: 98%