Accession Number:

AD0257897

Title:

INVESTIGATIONS OF BISMUTH-TELLURIUM-SULFUR COMPOUNDS

Descriptive Note:

Corporate Author:

GENERAL MILLS INC MINNEAPOLIS MINN

Personal Author(s):

Report Date:

1961-05-15

Pagination or Media Count:

1.0

Abstract:

A new semiconducting crystalline compound Bi8Te7S5, or gemilide, was prepared. The material is characterized by rhombohedral R3m symmetry, a large unit cell a is 8.3935 angstroms and c is 58.904 angstroms by hexagonal notation. It cleaves readily along the base plane perpendicular to the c-axis to yield mirror-like surfaces. The purity of the material is adequate to allow optical transmission measurements. The index of refraction in the infrared is around 7, decreasing linearly with the wavelength. Electrical and optical measurements on Bi8Te7S5 are reported. Different measuring techniques have been described in detail. The Lorenz number is found to be low for this material. With an improved Seebeck coefficient gemilide might be a good thermoelectric material. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE