Martinez-Garcia Jorge, Leoni Matteo, Scardi Paolo
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, Trento 38100, Italy.
Acta Crystallogr A. 2009 Mar;65(Pt 2):109-19. doi: 10.1107/S010876730804186X. Epub 2009 Jan 23.
Dislocations alter perfect crystalline order and produce anisotropic broadening of the X-ray diffraction profiles, which is described by the dislocation contrast factor. Owing to the lack of suitable mathematical tools to deal with dislocations in crystals of any symmetry, contrast factors are so far only known for a few slip systems in high-symmetry phases and little detail is given in the literature on the calculation procedure. In the present paper a general approach is presented for the calculation of contrast factors for any dislocation configuration and any lattice symmetry. The new procedure is illustrated with practical examples of hexagonal metals and some low-symmetry mineral phases.
位错会改变完美的晶体结构，并使X射线衍射图谱产生各向异性展宽，这由位错衬度因子来描述。由于缺乏适用于处理任何对称性晶体中位错的数学工具，到目前为止，仅知道高对称相中少数滑移系的衬度因子，而且文献中关于计算过程的细节很少。本文提出了一种通用方法，用于计算任何位错组态和任何晶格对称性的衬度因子。通过六方金属和一些低对称矿物相的实际例子来说明这一新方法。
