Preliminary results of the spectral selective characteristics of a cermet composed of a semiconducting cuprous oxide Cu20, in the matrix of a dielectric film of aluminium oxide, Al203, is presented for the first time. The composite film is charcterised by a hemispherical absorptance,∝, of 0.83, and thermal emittance at 100°C, eT of 0.29. These properties are observed to be little affected by a prolonged heating of the film in atmospheric air at 200°C for many hours.
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