SEMICONDUCTING COMPOUNDS WITH APPLICATIONS TO THERMOELECTRICITY.
Final rept. for Mar 63-Mar 64,
GENERAL ELECTRIC CO WEST LYNN MASS
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The report describes work done on a program having the objectives of generating new information on the transport properties of compound semiconductors and of extending the understanding of these materials and their properties. Reliable procedures were established for preparing samples of the system Mg2Ge sub x Sn sub 1-x with x ranging from 0 to 1, and the peritectic nature of the system was demonstrated. Samples were evaluated by measuring the Seebeck coefficient, electrical resistivity, thermal conductivity and Hall constant. Parameters of interest to thermoelectric applications were calculated from these experimental quantities. Preliminary evaluations were made of the doping effects of non-stoichiometric magnesium content and of aluminum and indium impurities. A brief discussion is presented of the possibilities of reducing thermal conductivity through magnetic scattering of phonons by phononassisted transitions between low-lying levels of electrons in the incomplete 3d or 4f shells of transition metal impurities introduced into the lattice. Author