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Transmission electron microscopy of experimentally deformed chalcopyrite single crystals

Physics and Chemistry of Minerals, ISSN: 0342-1791, Vol: 13, Issue: 6, Page: 393-402
1986
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Two crystals of natural chalcopyrite, CuFeS, experimentally deformed at 200° C have been studied by means of transmission electron microscopy (TEM). The activated glide planes are (001) and {112}. The dislocations in (001) have the Burgers vector [110] and a predominating edge character. They are split into two colinear partials b=1/2[110] and can cross split into {112}. The dislocations in {112} consist of straight segments along low index lattice lines. They are often arranged in dipoles generating trails of loops. Few dislocations with b=1/2[ {Mathematical expression}1] and [1 {Mathematical expression}0] are present and dislocations with b=[0 {Mathematical expression}1] occur in low angle subgrain boundaries. From weak beam contrasts it is presumed that most of the dislocations gliding in {112} have b=1/2〈3 {Mathematical expression}〉. They are dissociated into up to four partials. Microtwins and different types of stacking faults in {112} also occur. Models of the dissociation of dislocations are discussed. © 1986 Springer-Verlag.

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