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Void-Free Cuprous Oxide Tube Prepared by Thermal Oxidation on Outside of Copper Tube

A new setup in an oxidation system was proposed to remove voids from cuprous oxide during the oxidation of copper. The key is the formation of a single cuprous oxide layer. To form the layer on the outside surface of a copper tube, argon gas was introduced into the tube. In the cuprous oxide wall oxidized at 920–950 °C in air for 8 h, no voids were found. The diameter of the tube indicated that the voids were swept out from the inner unoxidized surface. This knowledge contributes to the development of the growth of high-quality cuprous oxide crystals.