GROWTH AND PERFECTION OF TETRAOXANE CRYSTALS

Tetraoxane (-CH2-O-)4 crystals grown by evaporation of solutions in acetone were examined by X-ray topography. Two types of crystals, long rod-shaped and thin plate-like, were obtained. No axial screw dislocation was observed. Dislocations with Burgers vectors 〈010〉 and 1 2〈110〉 were observed. They are thought to be introduced by the stress concentration at the inclusion. Some of the 〈010〉 dislocations were also introduced during the specimen handling procedure. The growth process of the crystal from the seed crystal was observed under an optical microscope. It was found that the observed glide systems (001) [010], (001)- 1 2 [110] were of minimal intermolecular repulsion from an analysis of the molecular arrangements during the slip motion. © 1979.