Electrical and Thermal Transport Property Studies of High-Temperature Thermoelectric Materials.

Abstract

High-temperature materials that exhibit small polaron conduction appear to exhibit the highest figures of merit. A thermoelectric model based on small polaron transport has been developed. The model predicts that broad-bandsemiconductors with small polarons hopping along inequivalent sites of distorted sublattices can result in increases in both the electrical conductivity and the Seeback coefficient with increasing temperature without significant increases in thermal conductivity. High figures of merit (ZT), greater than 1 at 1000K, that increase with increasing temperatures are predicted. The model is being applied to the divalent metal containing (Y,LA)Cr0(3) systems with an ABO(3) perovskite structure. Transport properties have been determined for various doping elements and for different compositions. These data are being used for the evaluation of this model. Additional keywords: rare earth, oxysulfides.

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Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1984
Accession Number
ADA150900

Entities

People

  • J. L. Bates

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Charge Carriers
  • Coefficients
  • Conductivity
  • Contracts
  • Data Acquisition
  • Electrical Conductivity
  • Electrons
  • Figure Of Merit
  • High Temperature
  • Materials
  • Measurement
  • Perovskites
  • Procurement
  • Program Management
  • Semiconductors
  • Thermal Conductivity
  • Transport Properties

Fields of Study

  • Materials science

Readers

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