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Title: High-temperature stability of thermoelectric Ca{sub 3}Co{sub 4}O{sub 9} thin films

An enhanced thermal stability in thermoelectric Ca{sub 3}Co{sub 4}O{sub 9} thin films up to 550 °C in an oxygen rich environment was demonstrated by high-temperature electrical and X-ray diffraction measurements. In contrast to generally performed heating in helium gas, it is shown that an oxygen/helium mixture provides sufficient thermal contact, while preventing the previously disregarded formation of oxygen vacancies. Combining thermal cycling with electrical measurements proves to be a powerful tool to study the real intrinsic thermoelectric behaviour of oxide thin films at elevated temperatures.
Authors:
; ;  [1] ; ;  [2]
  1. Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede (Netherlands)
  2. Department of Energy Conversion and Storage, Technical University of Denmark, DK-4000 Roskilde (Denmark)
Publication Date:
OSTI Identifier:
22398877
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 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; CALCIUM COMPOUNDS; COBALT OXIDES; HEATING; HELIUM; MIXTURES; OXYGEN; TEMPERATURE DEPENDENCE; THERMAL CYCLING; THERMOELECTRIC MATERIALS; THERMOELECTRIC PROPERTIES; THIN FILMS; VACANCIES; X-RAY DIFFRACTION