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A3: High temperature materials
The addition of nanophase particles is considered to be a good way to optimize thermoelectric properties and further enhance ZT value. The Si3N4 nanophase particles were chosen as additives due to chemical inertness and high-temperature stability, which has been used as coating materials to suppress the sublimation of the constitutes. Dense silicon-germanium-based nanocomposites dispersed with Si3N4 nanophase particles were prepared by spark plasma sintering technology. The effects of Si3N4 addition on the microstructure and thermoelectric properties were studied. The thermal conductivity of silicon-germanium alloys decreased induced due to additional phonon scattering effect of Si3N4 nano-particles. And the Seebeck coefficient increased due to potential barrier scattering effect. But the ZT value has not been obviously improved as a result of deterioration of electrical conductivity.
