INVESTIGATIONS OF BISMUTH-TELLURIUM-SULFUR COMPOUNDS

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)

Document Details

Document Type
Technical Report
Publication Date
May 15, 1961
Accession Number
AD0257897

Entities

People

  • H.h. Soonpaa
  • R.k. Mueller

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Advanced Materials
  • Coefficients
  • Elements
  • Engineered Materials
  • Group 16 Elements
  • Materials
  • Measurement
  • Notation
  • Plasmonic Materials
  • Refraction
  • Refractive Index
  • Sulfur
  • Sulfur Compounds
  • Symmetry
  • Tellurium

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.
  • Solar Photovoltaics and Thermoelectric Devices.