Abstract
The microstructure research of eco-friendly thermoelectric material is key to optimizing thermoelectrical properties. The microstructures of Cu2Ni0.1Sn0.9S3 ceramic with low thermal conductivity were studied using X-Ray diffraction, transmission electron microscopy and X-ray energy dispersive spectroscopy. The cubic metastable Cu26-x Ni4+x Sn4S32 nanoprecipitates embedded in the matrix were observed. This metastable nanoprecipitate shows certain orientation relationships with the matrixs and unclear interface area. Finally, the occupation semiorder of Cu atoms in Cu26-x Ni4+x Sn4S32 nanoprecipitates, coherent heterointerfaces between Cu26-x Ni4+x Sn4S32 and matrix can scattered phonon of similar wavelength to suppress lattice thermal conductivity.
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