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Investigators at California Institute of Technology Detail Findings in Advanced Material Research (Thermoelectric Properties and Microstructure...

August 5, 2014

Investigators at California Institute of Technology Detail Findings in Advanced Material Research (Thermoelectric Properties and Microstructure Studies of Spinodally Decomposed PbTe0.38S0.62 Alloy)

By a News Reporter-Staff News Editor at Journal of Technology -- Current study results on Advanced Material Research have been published. According to news reporting originating in Pasadena, California, by VerticalNews journalists, research stated, "PbTe is a premiere mid-range temperature thermoelectric material and recent studies have proven nanostructing as an effective approach to reduce thermal conductivity of alloys. Whereas, little attention has been given to long-term thermal stability of secondary phases and microstructural evolution."

The news reporters obtained a quote from the research from the California Institute of Technology, "Interestingly, replacing Te with S in PbTe provides an opportunity to form nanostructures in the bulk material through spinodal decomposition, which appears in binary phase diagrams of the PbTe-PbS system. Herein, the critical composition of PbTe0.38S0.62 alloy is fabricated to n-type by chlorine doping. Thermoelectric transport properties of the alloy are investigated in the 300-850 K temperature range and the maximum zT achieved at 800 K is 0.75 with a predicted zT similar to 0.85 at 750 K from single parabolic band model. The microstructure of the sintered samples was studied by FEG-SEM for both the as sintered and post transport properties measurement. The experimental results are compared with estimates from the parallel and series models for heterogeneous composites of single phase PbTe and PbS. The Seebeck coefficient is in agreement with the models predictions, but the resistivity is higher and the thermal conductivity is much lower than predicted values."

According to the news reporters, the research concluded: "We propose that this is attributed to the phonon and electron scattering on solute atoms in solid solutions and at interfaces."

For more information on this research see: Thermoelectric Properties and Microstructure Studies of Spinodally Decomposed PbTe0.38S0.62 Alloy. Science of Advanced Materials, 2014;6(7):1453-1459. Science of Advanced Materials can be contacted at: Amer Scientific Publishers, 26650 The Old Rd, Ste 208, Valencia, CA 91381-0751, USA. (American Scientific Publishers -

Our news correspondents report that additional information may be obtained by contacting S. Aminorroaya, California Institute of Technology, Pasadena, CA 91125, United States. Additional authors for this research include A.Z. Williams, D. Attard, G.S.X. Dou and G.J. Snyder.

Keywords for this news article include: Pasadena, California, United States, North and Central America, Advanced Material Research

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Source: Journal of Technology

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