Accession Number:

AD0606070

Title:

STRUCTURAL INVESTIGATIONS IN THERMOELECTRIC MATERIALS.

Descriptive Note:

Quarterly rept. no. 3, 1 Apr-30 Jun 63,

Corporate Author:

MERCK AND CO INC RAHWAY N J

Report Date:

1963-06-30

Pagination or Media Count:

1.0

Abstract:

Temperature curves of resistivity and Seebeck coefficient for the defect quaternary Cu12Cd6Sn6Se23 show an almost discontinuous anomaly in the range 125-175C, characterized by abrupt increase in resistivity and decrease in Seebeck coefficient. Compositional variation of parameters for the system Cu12Cd6xSn6-xSe23 has been completely surveyed. Homogeneity range is very limited, and the only pronounced effect is a strong doping by excess cadmium. The composition Cu12Zn6Sn6Se23 has been shown to be a random solid solution of ZnSe in Cu2SnSe3. The compositions CuCd2InSe4, CuCd2SbSe4, Cu3Cd2SbSe5, Cu4Cd2InSbSe8, and CuCd2SbSe5 were either solid solutions or inhomogeneous. On the other hand Cu2MnSnSe4-x, with equilibrium composition similar to Cu12Cd6Sn6Se23, is ordered and very similar to the cadmium quaternary. Both compounds are clearly related structurally to the mineral stannite Cu2FeSnS4, but unlike it, are not exactly tetragonal. An examination into the properties of ternaries having the structure of sulvanite Cu3VS4 has been initiated. Bonding in this system is tetrahedral, but not of diamond type.

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE