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XRD patterns of hot-pressed samples. The (111) and (220) peak positions for pure and were indicated by dotted lines. The inset shows the variation in lattice parameter of with increasing content of Sb. Trace of MgO is indicated by the symbol of circle.
Temperature dependences of (a) the electrical conductivity , (b) the Seebeck coefficient , (c) the thermal conductivity , and (d) the lattice thermal conductivity for .
Temperature dependences of dimensionless figure of merit for .
TEM images of with different natural nanostructures: (a) different natural nanostructures in the hot-pressed sample. Region A shows compositional fluctuation. Region B is the structural modulation with the feature size of , which is magnified in (b). Region C shows the nanodots of embedded in the matrix, which is magnified in (c) and (d). The inset in (c) is the SAED pattern.
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