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Cation size effect on the thermochromic properties of rare earth cobaltites RE
: La, Nd, Sm)
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RE CoO3 ( 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 CoO6/2 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 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 LaCoO3, NdCoO3, and SmCoO3, respectively.
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