Investigation of the Effect of NiO Nanoparticles on the Transport Properties of Zr0.5Hf0.5Ni1-xPdxSn0.99Sb0.01 (x=0 and 0.2)

Pierre Ferdinand P. Poudeu

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ppoudeup@umich.edu

2126 HH Dow

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Rumana Yaqub, Pranti Sahoo, Julien PA Makongo, Nathan Takas, Pierre FP Poudeu, and Kevin L Stokes (2011)

Science of Advanced Materials, 3(4):633-638.

We report the synthesis and thermoelectric properties of bulk nanocomposite materials based on the half-Heusler alloy Zr0.5Hf0.5Ni1-xPdxSn0.99Sb0.01 (x = 0 and 0.2). The half-Heusler matrix materials were prepared by conventional high-temperature solid-state methods followed by hot pressing. The resulting bulk matrix was mixed with different volume fractions of nanometer-sized NiO nanoparticles which were separately synthesized by a solution-phase chemical method. The resulting mixture was densified under uniaxial pressure (hot pressing) to form a composite. X-ray diffraction, thermal conductivity, electrical conductivity, and Seebeck coefficient were measured over the temperature range from 300 K to 750 K. The resulting composites were found to have both half-Heusler and full-Heusler phases, with no evidence of NiO nanoparticles. All materials and composites are n-type semiconductors. The electrical conductivities of all composite systems were increased and the magnitude of the Seebeck coefficient was decreased with respect to their host matrixes, consistent with a semiconductor/metal composite material.

Times Cited: 4 Si

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