The dislocation substructure in polycrystalline BaTiO3 pressureless sintered by a CO2 laser at 1390C was investigated via transmission electron microscopy. It reveals that high temperature deformation occurred when the slip systems <1¯10>pc{110}pc and <001>pc{100}pc were activated by the intrinsic sintering stress. The dissociation of dislocations b1 = [001]pc occurred by the reaction:

[001]pc  ½[011] + ½[0¯11]

The dissociated dislocations contain a series of scallop-shaped half-loop partials with Burgers vectors b3 = ½[0¯11]. The configuration of dissociated dislocations was developed by a mixed mechanism of climb and glide. The densification of the ceramics was contributed by plastic flow facilitated by both climb and glide of the dislocations with Burgers vectors <001>pc and <1¯10>pc. The dissociation plane appeared to be (10¯1)pc for the climb and glide mechanism.

Dislocation Substructures in CO2-Laser-Sintered Barium Titanate. M.H.Lin, H.Y.Lu: Physica Status Solidi A, 2002, 191[1], 58-66