The interest in thermoelectric phenomena and in their practical applications led to an investigation of semiconductors with high electric conductivities U and low thermal conductivities K . The requirement of the highest possible ratio of the mobility U to K I 68 A. F. yojfe and L. S. Stil'bans 8 1. I N T R O D U C T I O N * (IIU)we see that 7 is a function of the two dimensionless quantities ZT,, and T2/Tl.
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