Transmission electron microscopy was performed on the pyramidal slip dislocations which were activated in single crystals of this material, when compressed along the c-axis at 600 to 700C. The pyramidal slip dislocations were observed to bow out into the form of a hair-pin. These dislocations were shown to be super-partials, with a Burgers vector of 1/6<1¯1¯•6>. It was also shown that pairs of unlike super-partials, coupled by antiphase boundary, formed within the same temperature range.

Y.Minonishi: Proceedings of the Japan Academy B, 1995, 71[8], 256-9