Accession Number:

AD0606069

Title:

STRUCTURAL INVESTIGATIONS IN THERMOELECTRIC MATERIALS.

Descriptive Note:

Quarterly rept. no. 2, 1 Jan-31 Mar 63,

Corporate Author:

MERCK AND CO INC RAHWAY N J

Report Date:

1943-01-01

Pagination or Media Count:

1.0

Abstract:

An investigation was made into the thermoelectric properties of homogeneous quaternary systems has been launched with exploration of compositional types Cux Zn, Cd, Hg Ge, Sn Se, Te2x. The first member representing a valid phase was found to be a selenium-deficient Cu2CdSnSe4. The composition is more exactly represented by Cu12Cd6Sn6Se23. The compound possesses a complex superlattice based on zinc-blende, and melts at 765 degrees. It is a p-type semiconductor. The system Cu12Cd6xSn6-xSe23 is almost invariant for x -2 x 1. For x 1, degeneracy sets in for x 0, crystal lattice disorder occurs. Tin shows no sign of donar activity when in excess. Homologs of the cadmium-tin quaternary are being surveyed. Cu2HgSnSe4 forms a phase similar to the cadmium compound, but high mercury vapor pressure has defeated efforts to zone-level it. The germanium composition Cu2CdGeSe4 has a wurtzitetype structure, but shatters tubes when the melt freezes. No silver or tellurium homologs have yet been found.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE