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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.

Results are presented of a study of the thermal conductivity of single‐crystalline β‐rhombohedral boron samples, carbon‐alloyed boron, α‐AlB12, and amorphous boron in the temperature range 80 to 1100 °K, and of β‐AlB12 in the 80 to 400 °K range. These data together with published data on the thermal conductivity of B12As2, B12P2, and YB66 are considered within the framework of a model taking into account the effect of crystal structure on thermal conductivity. An explanation for the small contribution of optical phonons to the thermal conductivity is suggested.

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