We develop a solid understanding of the temperature-dependent solubility of sodium in p-type PbTe, the most efficient thermoelectric material. The maximum solubility of sodium telluride (NaTe) in PbTe is measured to be 1.4 ± 0.3 at% and the heat of solution is evaluated as 26+19−11 kJ mol−1 that addresses fundamental issues regarding the formation of nano-precipitates.
S. A. Yamini, T. Ikeda, A. Lalonde, Y. Pei, S. X. Dou and G. J. Snyder, J. Mater. Chem. A, 2013, 1, 8725 DOI: 10.1039/C3TA11654A
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