Dislocation images in quartz and the determination of Burgers vectors

A. J. Ardell Materials Department, School of Engineering and Applied Science, University of California, Los Angeles, U.S.A.

J. M. Christie Materials Department, School of Engineering and Applied Science, University of California, Los Angeles, U.S.A.; Geology Department, University of California, Los Angeles, U.S.A.

J. W. Mccormick Materials Department, School of Engineering and Applied Science, University of California, Los Angeles, U.S.A.; Geology Department, University of California, Los Angeles, U.S.A.

Abstract

It is demonstrated that the Burgers vectors of dislocations in quartz can be positively identified from the results of conventional diffraction contrast experiments in the electron microscope. Dislocations having an a Burgers vector were found in experimentally-deformed natural and synthetic crystals, and dislocations with a c Burgers vector were also observed in a synthetic crystal. The factors that complicate the successful execution of diffraction contrast experiments on quartz are discussed.

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Dislocation images in quartz and the determination of Burgers vectors

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