期刊
CHEMPHYSCHEM
卷 19, 期 1, 页码 108-115出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201700930
关键词
electron diffraction; energy transfer; materials science; solid-state structures; Zn-Sb compounds
资金
- Programme Commission on Sustainable Energy and Environment, The Danish Council for Strategic Research [1305-00002B]
We demonstrate an advanced approach using state of the art insitu transmission electron microscopy (TEM) to understand the interplay between nanostructures and thermoelectric (TE) properties of high-performance Mg-doped Zn4Sb3 TE systems. By using the technique, microstructure and crystal evolutions of TE material have been dynamically captured as a function of temperature from 300K to 573K. On heating, we have clearly observed precipitation and growth of a Zn-rich secondary phase as nanoinclusions in the matrix of primary Zn4Sb3 phase. Elemental mapping by STEM-EDX spectroscopy reveals enrichment of Zn in the secondary Zn6Sb5 nanoinclusions during the thermal processing without decomposition. Such nanostructures strongly enhances phonon scattering, resulting in a decrease in the thermal conductivity leading to a zT value of 1.4 at 718K.
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