Abstract
Observation of the deformation of thin lanthanum oxysulphide specimens inside the transmission electron microscope has revealed the intimate connection between defects and structure. A pyramidal glide system was identified, from slip propagation and slip steps next the 〈101̄0〉 directions, screw dislocations with a Burgers vector 1 3 [1̄1̄23] and pyramidal dislocation loops. With this type of crystal, the glide plane {101̄1}, is parallel to the faces of the OLa 4 tetraedron.
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