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Effects of Ir Substitution and Processing Conditions on Thermoelectric Performance of p-Type Zr0.5Hf0.5Co1−x Ir x Sb0.99Sn0.01 Half-Heusler Alloys

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A series of samples with the composition Zr0.5Hf0.5Co1−x Ir x Sb0.99Sn0.01 (x = 0.0 to 0.7) were synthesized by high-temperature solid-state reaction at 1173 K. High-density pellets of the powders were obtained using hot press (HP) and spark plasma sintering (SPS) techniques. The thermoelectric properties of the pellets were measured from 300 K to 750 K. Independently of the pressing conditions, all Ir-containing samples (x > 0) showed p-type semiconducting behavior. At 300 K, the electrical conductivity and thermopower of Zr0.5Hf0.5Co1−x Ir x Sb0.99Sn0.01 materials surprisingly increased with increasing Ir concentration. The largest electrical conductivity and thermopower values of 150 S/cm and 140 μV/K, respectively, were observed at 300 K for x = 0.7. The thermal conductivity of the synthesized materials decreased with increasing Ir content, went through a minimum value (x = 0.3), and increased thereafter with further addition of Ir. Pellets fabricated by SPS showed smaller thermal conductivity than pellets of the same composition obtained from uniaxial hot pressing. A thermal conductivity value of ∼2.0 W/m K was observed at 300 K for an SPS pellet with the com- position Zr0.5Hf0.5Co0.5Ir0.5Sb0.99Sn0.01. The thermal conductivity of Zr0.5Hf0.5- Co1−x Ir x Sb0.99Sn0.01 decreased with rising temperature, and the smallest value of ∼1.5 W/m K was observed at 750 K for the SPS specimen with x = 0.5.

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Authors and Affiliations

  1. The Advanced Materials Research Institute, University of New Orleans, New Orleans, LA, 70148, USA

    Nathan J. Takas, Pranati Sahoo, Dinesh Misra, Hongfang Zhao, Nathaniel L. Henderson, Kevin Stokes & Pierre F.P. Poudeu

  2. Department of Chemistry, University of New Orleans, New Orleans, LA, 70148, USA

    Pranati Sahoo, Hongfang Zhao & Pierre F.P. Poudeu

  3. Department of Physics, University of New Orleans, New Orleans, LA, 70148, USA

    Kevin Stokes

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  1. Nathan J. Takas
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  2. Pranati Sahoo
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  3. Dinesh Misra
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  4. Hongfang Zhao
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  7. Pierre F.P. Poudeu
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Correspondence to Pierre F.P. Poudeu.

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Takas, N.J., Sahoo, P., Misra, D. et al. Effects of Ir Substitution and Processing Conditions on Thermoelectric Performance of p-Type Zr0.5Hf0.5Co1−x Ir x Sb0.99Sn0.01 Half-Heusler Alloys. J. Electron. Mater. 40, 662–669 (2011). https://doi.org/10.1007/s11664-010-1501-0

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  • DOI: https://doi.org/10.1007/s11664-010-1501-0

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