Abstract
Abstract Experimentally deformed pyrite monocrystals have been studied by TEM at 100 and 200 kV. One sample was strained in compression along the 〈111〉 axis at 400°C. The three slip systems {001}〈010〉 are equally activated; dislocations parallel to 〈110〉 have a 45°-mixed character and are dissociated in the glide plane into two colinear partials. In another sample deformed in the [001] orientation at 779°C the predominant slip system appears to be (001)[010]; the dislocations are mainly parallel to 〈100〉 and dissociated, the plane of dissociation depending on their edge or screw character. Dislocation loops formed by condensation of sulphur vacancies can be faulted or not. The fault vector leading to a very low defect energy has the same displacement vector as that of the growth defects observed in some natural pyrites.
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