Transmission electron microscopy determinations of dislocation Burgers vectors in plastically deformed yttrium iron garnet single crystals

Abstract

Dislocations have been studied in YIG by transmission electron microscopy. Loops are found to have (a/2) 〈111〉 Burgers vectors whereas dislocation segments may have (a/2) 〈111〉 or a 〈001〉 ones, the latter resulting from the attractive reaction of dislocations with (a/2) 〈111〉 Burgers vectors. Owing to the large unit cell of YIG, experimental imaging conditions prevented from concluding on the possibility of dislocation dissociation.