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Room temperature Seebeck coefficient of the surface of the relatively homogeneous PbTe sample from Teledyne. (a) Image and (b) histogram obtained from the scanning Seebeck microprobe.
Seebeck coefficient scan of illustrating the inhomogeneities present. (a) Image and (b) histogram obtained from the scanning Seebeck microprobe.
Seebeck coefficient scan of showing an interfacial region.
(a) Seebeck coefficient scan of showing macroscopic geometrical features and (b) strongly non-Gaussian histogram. The sharp horizontal lines are due to contamination of the probe tip.
Average room temperature Seebeck values and standard deviation (std. dev.) from direct two-point Seebeck measurements. All the alloy samples prepared by slow cooling are significantly more inhomogeneous than the PbTe sample from Teledyne. Quenching produces less variation (std. dev.) in Seebeck values than slow cooling.
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