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Title: Effects of Rh on the thermoelectric performance of the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler alloys

Abstract

We show that Rh substitution at the Co site in Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} (0<=x<=1) half-Heusler alloys strongly reduces the thermal conductivity with a simultaneous, significant improvement of the power factor of the materials. Thermoelectric properties of hot-pressed pellets of several compositions with various Rh concentrations were investigated in the temperature range from 300 to 775 K. The Rh 'free' composition shows n-type conduction, while Rh substitution at the Co site drives the system to p-type semiconducting behavior. The lattice thermal conductivity of Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} alloys rapidly decreased with increasing Rh concentration and lattice thermal conductivity as low as 3.7 W/m*K was obtained at 300 K for Zr{sub 0.5}Hf{sub 0.5}RhSb{sub 0.99}Sn{sub 0.01}. The drastic reduction of the lattice thermal conductivity is attributed to mass fluctuation induced by the Rh substitution at the Co site, as well as enhanced phonon scattering at grain boundaries due to the small grain size of the synthesized materials. - Graphical abstract: Significant reduction of the lattice thermal conductivity with increasing Rh concentration in the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler materials prepared by solid state reaction at 1173 K.

Authors:
 [1]; ;  [1];  [1];  [1]
  1. Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148 (United States)
Publication Date:
OSTI Identifier:
21372600
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 5; Other Information: DOI: 10.1016/j.jssc.2010.03.023; PII: S0022-4596(10)00113-1; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIMONY ALLOYS; COBALT ALLOYS; GRAIN BOUNDARIES; GRAIN SIZE; HAFNIUM ALLOYS; HEUSLER ALLOYS; PERFORMANCE; RHODIUM ALLOYS; SCATTERING; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TEMPERATURE RANGE 1000-4000 K; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS; THERMOELECTRIC PROPERTIES; TIN ALLOYS; ZIRCONIUM ALLOYS; ALLOYS; ALUMINIUM ALLOYS; COPPER ALLOYS; COPPER BASE ALLOYS; CORROSION RESISTANT ALLOYS; ELECTRICAL PROPERTIES; MANGANESE ALLOYS; MATERIALS; MICROSTRUCTURE; PHYSICAL PROPERTIES; PLATINUM METAL ALLOYS; SIZE; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT ALLOYS

Citation Formats

Maji, Pramathesh, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Takas, Nathan J, Misra, Dinesh K, Gabrisch, Heike, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Stokes, Kevin, Department of Physics, University of New Orleans, New Orleans, LA 70148, Poudeu, Pierre F.P., E-mail: ppoudeup@uno.ed, and Department of Chemistry, University of New Orleans, New Orleans, LA 70148. Effects of Rh on the thermoelectric performance of the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler alloys. United States: N. p., 2010. Web. doi:10.1016/j.jssc.2010.03.023.
Maji, Pramathesh, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Takas, Nathan J, Misra, Dinesh K, Gabrisch, Heike, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Stokes, Kevin, Department of Physics, University of New Orleans, New Orleans, LA 70148, Poudeu, Pierre F.P., E-mail: ppoudeup@uno.ed, & Department of Chemistry, University of New Orleans, New Orleans, LA 70148. Effects of Rh on the thermoelectric performance of the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler alloys. United States. https://doi.org/10.1016/j.jssc.2010.03.023
Maji, Pramathesh, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Takas, Nathan J, Misra, Dinesh K, Gabrisch, Heike, Department of Chemistry, University of New Orleans, New Orleans, LA 70148, Stokes, Kevin, Department of Physics, University of New Orleans, New Orleans, LA 70148, Poudeu, Pierre F.P., E-mail: ppoudeup@uno.ed, and Department of Chemistry, University of New Orleans, New Orleans, LA 70148. 2010. "Effects of Rh on the thermoelectric performance of the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler alloys". United States. https://doi.org/10.1016/j.jssc.2010.03.023.
@article{osti_21372600,
title = {Effects of Rh on the thermoelectric performance of the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler alloys},
author = {Maji, Pramathesh and Department of Chemistry, University of New Orleans, New Orleans, LA 70148 and Takas, Nathan J and Misra, Dinesh K and Gabrisch, Heike and Department of Chemistry, University of New Orleans, New Orleans, LA 70148 and Stokes, Kevin and Department of Physics, University of New Orleans, New Orleans, LA 70148 and Poudeu, Pierre F.P., E-mail: ppoudeup@uno.ed and Department of Chemistry, University of New Orleans, New Orleans, LA 70148},
abstractNote = {We show that Rh substitution at the Co site in Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} (0<=x<=1) half-Heusler alloys strongly reduces the thermal conductivity with a simultaneous, significant improvement of the power factor of the materials. Thermoelectric properties of hot-pressed pellets of several compositions with various Rh concentrations were investigated in the temperature range from 300 to 775 K. The Rh 'free' composition shows n-type conduction, while Rh substitution at the Co site drives the system to p-type semiconducting behavior. The lattice thermal conductivity of Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} alloys rapidly decreased with increasing Rh concentration and lattice thermal conductivity as low as 3.7 W/m*K was obtained at 300 K for Zr{sub 0.5}Hf{sub 0.5}RhSb{sub 0.99}Sn{sub 0.01}. The drastic reduction of the lattice thermal conductivity is attributed to mass fluctuation induced by the Rh substitution at the Co site, as well as enhanced phonon scattering at grain boundaries due to the small grain size of the synthesized materials. - Graphical abstract: Significant reduction of the lattice thermal conductivity with increasing Rh concentration in the p-type Zr{sub 0.5}Hf{sub 0.5}Co{sub 1-x}Rh{sub x}Sb{sub 0.99}Sn{sub 0.01} half-Heusler materials prepared by solid state reaction at 1173 K.},
doi = {10.1016/j.jssc.2010.03.023},
url = {https://www.osti.gov/biblio/21372600}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 5,
volume = 183,
place = {United States},
year = {Sat May 15 00:00:00 EDT 2010},
month = {Sat May 15 00:00:00 EDT 2010}
}