Synthesis Tailoring the Thermal Conductivity of Sr Doped Bi_2Se_3 Thermoelectric Material

摘要

We have investigated the thermal transport properties of Sr_xBi_(2-x)Se3 (x=0, 0.05, 0.2). The samples were synthesized by melt route method followed by vacuum hot press. The structural and morphological information of sample has been retrieved using x-ray diffraction (XRD) and scanning electron microscopy (SEM). The thermal transport measurement were performed in the temperature range of 300-550 K. It is found that with increasing Sr content the total thermal conductivity of the material decreases which is attributed to the enhance phonon scattering due to natural grown layered structure and defect induced by Sr doping.