Small-angle symmetrical [001] tilt grain boundaries in cubic bicrystals, with misorientation angles of 1 or 5° were fabricated by diffusion bonding. High-resolution electron microscopic observations revealed that the 1° boundary consisted of a periodic array of mixed dislocations, with Burgers vectors of a/2[101] or a/2[101]. The 5° boundary consisted of a periodic array of edge dislocations, with a Burgers vector of a/2[100], which were associated with stacking faults at intervals. It was suggested that there was a critical angle for structural transitions in the series of [001] small-angle tilt grain boundaries.

Stacking-Fault Formation in [001] Small-Angle Symmetric Tilt Grain Boundaries in Cubic Zirconia Bicrystals. N.Shibata, N.Morishige, T.Yamamoto, Y.Ikuhara, T.Sakuma: Philosophical Magazine Letters, 2002, 82[4], 175-81