Improvement of thermoelectric properties and stability of GeTe materials doped with Pb and Cd
Taking GeTe alloy as the research object,GeTe-PbTe solid solution alloy was formed by doping Pb element to broaden the phase transition temperature zone,enhance the long-term stability of the material and improve the thermoelectric properties.In order to further improve the thermo-electric properties of the material,Cd element was doped in GeTe-PbTe solid solution alloy,and the sample of(GeTe)0.91-x(CdTe)x(PbTe)0.09 alloy was prepared by melting,vacuum hot pressing and anneal-ing.When x=0.04,the sample was obtained.The maximum ZT value is 1.72 at 773 K temperature.The working stability of GeTe alloy,(GeTe)0.91(PbTe)0.09 alloy,(GeTe)0.87(CdTe)0.04(PbTe)0.09 alloy was tested.The test results show that:the stability of GeTe alloy can be significantly improved by doping Pb and Cd elements at the same time,and the maximum output power attenuation rate of the ther-moelectric monocouple composed of N-PbTe material is only 3.11％.
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