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Thermoelectric Performance of Nanostructured ZrNiSn Compounds Synthesized by Mechanical Alloying

Published online by Cambridge University Press:  01 February 2011

Jeffrey D Germond ,
Paul J Schilling ,
Nathan J. Takas  and
Pierre F. P. Poudeu
Jeffrey D Germond
Affiliation:
[email protected], University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Paul J Schilling
Affiliation:
[email protected], University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Nathan J. Takas
Affiliation:
[email protected], University of New Orleans, Advanced Materials Research Institute, 2000 Lakeshore Dr., New Orleans, Louisiana, 70148, United States, 1(504)280-5629, 1(504)280-3185
Pierre F. P. Poudeu
Affiliation:
[email protected], University of New Orleans, Chemistry, 2000 Lakeshore Dr, SC2005, New Orleans, Louisiana, 70148, United States, (504)2801057, (504)2803185
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Abstract

Samples with a composition ZrNiSn were synthesized by a combination of mechanical alloying (MA) and consolidation by either Spark Plasma Sintering (SPS) or hot pressing (HP). Appropriate stoichiometric ratios of the starting materials were milled under an inert atmosphere in a high energy ball mill for 6 hours, achieving a half-Heusler phase. X-Ray diffraction patterns of as milled powders and consolidated samples were compared and analyzed for phase purity. Thermal conductivity, electrical conductivity and Seebeck coefficient were measured as a function of temperature in the range 300 K to 800 K and compared with measurements reported for high temperature solid state reaction synthesis of this compound. HP samples, compared to SPS samples, demonstrate increased grain growth due to longer heating times. Reduced grain size achieved by MA and SPS causes increased phonon scattering due to the increased number of grain boundaries, which lowers the thermal conductivity without doping the base system with addition phonon scattering centers.

Keywords

thermoelectricmechanical alloyingnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD03-12
Copyright
Copyright © Materials Research Society 2010

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