Accession Number : AD0836754

Title :   IMPROVED THERMOELECTRIC MATERIALS FOR MILITARY GROUND AIR CONDITIONERS.

Descriptive Note : Final technical rept. 1 Oct 66-31 May 68,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Carlson, R. O. ; Kendall, L. F.

Report Date : JUN 1968

Pagination or Media Count : 47

Abstract : This program was a study of a new concept for reducing lattice thermal conductivity by scattering of phonons with paramagnetic ions having ground-state energy level separations comparable to the phonon energies. Lead telluride was chosen for this experiment because of its crystalline symmetry and because its chemical and electronic properties are relatively well-known. Thirteen different elements from the transition metal and rare earth groups were added to pure lead telluride, including both elements thought to have the required energy levels, and, for comparative purposes, some expected to have no 'magnetic scattering' effect. Although significant reductions in thermal conductivity at 90K were observed, no reduction could be clearly attributed to phonon scattering by paramagnetic ions. (Author)

Descriptors :   *THERMOELECTRICITY), (*AIR CONDITIONING EQUIPMENT, LEAD COMPOUNDS, TELLURIDES, DOPING, PHONONS, THERMAL CONDUCTIVITY, ATOMIC ENERGY LEVELS, PARAMAGNETIC MATERIALS.

Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE