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Title: Cation size effect on the thermochromic properties of rare earth cobaltites RECoO{sub 3} (RE: La, Nd, Sm)

RECoO{sub 3} (RE: rare earth) perovskite thin films have been deposited at room temperature by direct current co-sputtering and subsequent annealing in air at 923 K during 1 day. The effect of the octahedra tilts on the optical properties has been tracked decreasing the RE cation size. The bending and stretching vibrational modes of the CoO{sub 6/2} octahedra give information on the Co–O distances and the Co–O–Co angles which determine the Co–O overlap integral and hence the electric properties of these perovskites. Transmittance measurements in the 1.42–100 μm wavelength range show a high transparency at room temperature. When temperature increases, an optical screening effect depending on the RE{sup 3+} ionic radii (i.e., Co-O-Co angles) and resulting from the electrical behaviour occurs. At the wavelength of 8 μm, the transmittance drops from about 90% at room temperature to 50% at the temperature of 516, 600, and 640 K for LaCoO{sub 3}, NdCoO{sub 3}, and SmCoO{sub 3}, respectively.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Université de Lorraine, Institut Jean Lamour, Département CP2S, UMR 7198, Parc de Saurupt, CS 50840, 54011 Nancy (France)
  2. LCPME, UMR 7564, CNRS Université de Lorraine, 405 rue de Vandoeuvre, 54600 Villers-lès-Nancy (France)
  3. Institut FEMTO-ST, Département MN2S, UMR 6174, 32, Avenue de l'Observatoire, 25044 Besançon Cedex (France)
Publication Date:
OSTI Identifier:
22218005
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 11; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; ATOMIC RADII; CATIONS; COBALT OXIDES; DEPOSITION; DIRECT CURRENT; ELECTRIC CONDUCTIVITY; INFRARED SPECTRA; OPACITY; PEROVSKITE; RARE EARTHS; RHENIUM IONS; SPUTTERING; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; WAVELENGTHS