Growth of Single Crystal Cuprous Oxide from the Melt and Luminescence of Cuprous Oxide

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Abstract
A number of crucible materials were evaluated for melting . Only appears to be sufficiently nonreactive for use in crystal growing. A melt of cuprous oxide contained in a magnesia crucible when cooled at a rate of 2.5°C per hour produced large single crystals. Attempts to accelerate growth by cooling at a rate of 13.5°C per hour produced only small polycrystals. A (100) seed cut from the single crystal along natural cleavage lines was used to pull a crystal from the melt by the Czochralski method. A tendency to grow off‐axis resulted in beautiful subsurface facets of transparent ruby‐red material. Two new forms of luminescence were observed during rapid cooling of solid cuprous oxide. From 1175° to 1145°C continuous light emission was observed in the yellow‐green region. From 1125° to 975°C flashing points of light were observed in the same spectral region.

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