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Synthesis and Thermoelectric Properties of Doped Yb14MnSb11-xBix Zintls

Published online by Cambridge University Press:  01 February 2011

Kurt Star ,
Alex Zevalkink ,
Chen-Kuo Huang ,
Bruce Dunn  and
Jean-Pierre Fleurial
Kurt Star
Affiliation:
kurtstar@ucla.edu, University of California Los Angeles, Material Science and Engineering, Los Angeles, California, United States
Alex Zevalkink
Affiliation:
alex.z.williams@gmail.com, California Institute of Technology, Materials Science Department, Pasadena, California, United States
Chen-Kuo Huang
Affiliation:
Chen-Kuo.Huang@jpl.nasa.gov, Jet Propulsion Laboratory/California Institute of Technology, Thermal Energy Conversion Technologies, Pasadena, California, United States
Bruce Dunn
Affiliation:
bdunn@ucla.edu, University of California Los Angeles, Material Science and Engineering, Los Angeles, California, United States
Jean-Pierre Fleurial
Affiliation:
jean-pierre.fleurial@jpl.nasa.gov, Jet Propulsion Laboratory/California Institute of Technology, Thermal Energy Conversion Technologies, Pasadena, California, United States
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Abstract

Yb14MnSb11 is a very promising thermoelectric material for high temperature applications. This compound is a member of a large family of Zintl phases with a “14-1-11” A14MPn11 stoichiometry (Pn = P, As, Sb, Bi; A = Ca, Ba, La, Sr, Yb, Eu; M = Mn, Al, Cd, Ga, In, Nb, Zn). Yb14MnSb11 exhibits low lattice thermal conductivity values and a p-type semimetallic behavior with values of the non-dimensional figure of merit zT peaking at 1.4 above 1200 K. There is significant interest in investigating how substitutions on any of the atomic sites impact the charge carrier concentration and mobility, band gap and lattice thermal conductivity. Recent reports have studied substitutions on the Yb and Mn sites with the goal of reducing hole carrier concentration and improving carrier mobility values.

High energy ball milling has been shown to be a convenient method of synthesis to prepare Yb14MnSb11 and it has been used here to explore the solid solution systems derived from this compound by substituting Sb with Bi. High energy ball milling is a non-equilibrium process and not all of the 14-1-11 compounds are easily formed with this method. Characterization of the synthesized compositions was done by X-ray diffraction, electron microprobe, and high temperature measurements of the electrical and thermal transport properties up to 1275 K. The experimental results on undoped and doped solid solution samples are compared to that of pure Yb14MnSb11 samples prepared by the same high energy ball milling technique.

Keywords

thermoelectricreactive ball millinghot pressing
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-DD03-05
Copyright
Copyright © Materials Research Society 2010

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