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Room temperature Seebeck coefficient (S) versus Hall carrier concentration (nH) for various series of PbTe alloys from this work and literatures [53, 56] (a) and MnTe-alloying concentration-dependent Seebeck coefficient and Hall carrier concentration at room temperature (b) for Na0.02Eu0.03MnxPb0.95-xTe synthesized in this work. Calculated band structures (c) and density of states (d) of Pb27Te27, Pb26MnTe27 and Pb25EuMnTe27 with a setting of valence band maximum (VBM) at 0 eV.
