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Nanostructures and defects in thermoelectric AgPb18SbTe20 single crystal

J. Appl. Phys. 105, 094317 (2009); doi:10.1063/1.3124364

Published 6 May 2009

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Lijun Wu,1 Jin-Cheng Zheng,1,2 Juan Zhou,1 Qiang Li,1 Jihui Yang,3 and Yimei Zhu1
1Brookhaven National Laboratory, Upton, New York 11973, USA
2Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005, People's Republic of China
3Materials and Processes Laboratory, General Motors R&D Center, Warren, Michigan 48090, USA
Nanoparticles play key roles in reducing thermal conductivity, and hence increasing figure of merit for many thermoelectric materials. We have studied the structure of AgPb18SbTe20 (LAST-18) using high resolution imaging, nanoelectron diffraction, energy dispersive spectrum, and electron energy loss spectrum, and observed a range of nanoparticles with different sizes (from less than 1  nm to more than 10  nm) and shape (sphere, ellipse, square, etc.). The lattice parameters of the nanoparticles have a wide range from 0.601  to  0.655  nm, while those of the matrix have a range from 0.633  to  0.646  nm. The nanoparticles are formed due to the ordering of Pb and Ag–Sb. There are four ordered structures with primitive cubic, primitive tetragonal (T1, a[approximate]a0/[square root of]2, c[approximate]a0, here, a0 is the lattice parameter of the rocksalt-type matrix), primitive tetragonal (T2, a[approximate]a0/[square root of]2, c[approximate]2a0), and body-centered tetragonal (T3, a[approximate]a0/[square root of]2, c[approximate]3a0) lattices, respectively. Antiphase domains, twins, and phase separations were often observed in the nanoparticles. The strain field in the surrounding matrix due to the presence of nanoparticles was retrieved from the high resolution images. The characteristic that the strain field is anisotropic and extends to large area is considered to enhance the scattering of the phonons. The results provide quantitative structure information about nanoparticles, that is essential for the understanding of the origin of the high thermoelectric performance in this class of materials. ©2009 American Institute of Physics
History: Received 19 December 2008; accepted 26 March 2009; published 6 May 2009
Permalink: http://link.aip.org/link/?JAPIAU/105/094317/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.66.Fn
    Crystal structure of specific inorganic compounds
  • 61.72.Mm
    Grain and twin boundaries
  • 79.20.Uv
    Electron energy loss spectroscopy
  • 72.20.Pa
    Thermoelectric and thermomagnetic effects (semiconductors/insulators)
  • 72.80.Jc
    Electrical conductivity of other crystalline inorganic semiconductors
  • 66.70.Df
    Nonelectronic thermal conduction and heat-pulse propagation in metals, alloys and semiconductors
  • 63.22.Kn
    Phonons and vibrational states in clusters and nanocrystals
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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