## Abstract

Hirschet al. (1960) have developed a kinematical theory for the diffraction contrast of the electron microscope image of a perfect screw dislocation parallel to the surface of the crystal foil. The present author (Gevers 1962 a, b) has extended their theory for a perfect dislocation of mixed type with slip plane parallel to the surface. In this paper the theory is applied to a partial screw dislocation parallel to the surface. Numerical calculations have been performed for n = ± ⅓, ± ⅔, ± 4/3, ± 5/3, ± 7/3, ± 8/3, where n = g • b (g: diffraction vector, b: Burgers vector). It is found that for n = ⅓ the line contrast is unimportant, probably negligible, that for n = ⅔ an observable line image superposed on the stackingfault contrast should be present, and that for larger values of n the line contrast becomes much more important than the stacking-fault contrast.

Original language | English |
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Pages (from-to) | 769-785 |

Number of pages | 17 |

Journal | The philosophical magazine |

Volume | 8 |

Issue number | 89 |

DOIs | |

State | Published - May 1963 |

## ASJC Scopus subject areas

- General Engineering
- General Physics and Astronomy