| 초록 |
We investigate the effect of ZnTe alloying on PbTe to enhance thermoelectric performance. We present structural, microscopic, and spectroscopic analyses, and thermoelectric transport properties coupled with Pb0.985Na0.015Te-x% ZnTe (x= 0, 1, 2, 4). The lattice thermal conductivity of p-type Pb0.985Na0.015Te decreases upon 2% ZnTe alloying, which exceeds solubility limit of ZnTe in PbTe maxtrix, because of forming the microscale precipitates. As a result, the spark plasma-sintered Pb0.985Na0.015Te-2% ZnTe exhibits a maximum thermoelectric figure of merit (ZT) of 1.73 at 700K, which is attributed from the reduced lattice thermal conductivity of ~0.69W·m-1K-1 in comparison with Pb0.985Na0.015 Te. |
