skip to main content

SciTech ConnectSciTech Connect

Title: Determining conductivity and mobility values of individual components in multiphase composite Cu{sub 1.97}Ag{sub 0.03}Se

The intense interest in phase segregation in thermoelectrics as a means to reduce the lattice thermal conductivity and to modify the electronic properties from nanoscale size effects has not been met with a method for separately measuring the properties of each phase assuming a classical mixture. Here, we apply effective medium theory for measurements of the in-line and Hall resistivity of a multiphase composite, in this case Cu{sub 1.97}Ag{sub 0.03}Se. The behavior of these properties with magnetic field as analyzed by effective medium theory allows us to separate the conductivity and charge carrier mobility of each phase. This powerful technique can be used to determine the matrix properties in the presence of an unwanted impurity phase, to control each phase in an engineered composite, and to determine the maximum carrier concentration change by a given dopant, making it the first step toward a full optimization of a multiphase thermoelectric material and distinguishing nanoscale effects from those of a classical mixture.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Department of Materials Science, California Institute of Technology, MC 309-81, Pasadena, California 91106 (United States)
  2. (United States)
  3. Department of Chemistry, University of Southern California, Seeley G. Mudd Bldg., 3620 McClintock Ave., Los Angeles, California 90089-1062 (United States)
Publication Date:
OSTI Identifier:
22310653
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARRIER MOBILITY; CARRIERS; CHARGE CARRIERS; COPPER COMPOUNDS; IMPURITIES; MAGNETIC FIELDS; NANOSTRUCTURES; OPTIMIZATION; SEGREGATION; SELENIUM COMPOUNDS; SILVER COMPOUNDS; THERMAL CONDUCTIVITY; THERMOELECTRIC MATERIALS