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Title: High-temperature electrical transport behaviors in textured Ca{sub 3}Co{sub 4}O{sub 9}-based polycrystalline ceramics

Highly (00l) oriented Ca{sub 3}Co{sub 4}O{sub 9}-based ceramics were fabricated by spark plasma sintering combined with a dynamic forging process. The grain orientation is effective in lowering the electrical resistivity and enhancing the thermoelectric power factor but with little influence on the Seebeck coefficient. A metallic-to-semiconducting transition temperature can be observed and the activation energy is almost independent of the La-doping. All of the Ca{sub 3}Co{sub 4}O{sub 9}-based ceramic samples exhibit large thermoelectric power, and the figure of merit for La-doped Ca{sub 3}Co{sub 4}O{sub 9} sample can reach 0.26 at 975 K, which can be a promising candidate of p-type material for high-temperature thermoelectric application.
Authors:
; ; ; ;  [1] ;  [2]
  1. Department of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084 (China)
  2. Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, S-106 91 Stockholm (Sweden)
Publication Date:
OSTI Identifier:
21175974
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 94; Journal Issue: 7; Other Information: DOI: 10.1063/1.3086875; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACTIVATION ENERGY; CALCIUM COMPOUNDS; CERAMICS; COBALT OXIDES; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; FORGING; GRAIN ORIENTATION; PLASMA; POLYCRYSTALS; POWER FACTOR; SEEBECK EFFECT; SINTERING; TEMPERATURE RANGE 0400-1000 K; TRANSITION TEMPERATURE