Experimental Observations of Dislocations in Ceramics

After the above conceptual discussion of dislocation and some of its features, the following presents relevant experimental observations regarding dislocation types 

Inset is the Burgers circuit around a dislocation, and the Burgers vector is /2[110] [50]. With kind permission of Professor Shibata 

It was observed that perfect dislocatioDS in the basal plane, embedded in an a-type extended planar SF hexagonal (h-) BaTiOs with a Burgers vector of bn = 1/3(1210), were dissociated into prism plane half-partials with Burgers vectors bp = l/3(0ll0). 

Previous Sect. 3.3.6 indicated that dislocation motion may be conservative (glide) and nonconservative (climb). For glide, the Burgers vector and dislocation must be in the same plane. Unlike edge dislocations (as indicated above), screw 

As usual, one of the accepted steady-state creep rates is given as  

---