Abstract
In recent years many new materials have been involved in grain boundary studies. Many of them, have rather complex crystal lattices with low symmetry. For experimental studies and computer simulations of grain boundaries some theoretical tools are necessary. The main tool is the Coincidence Site Lattice (CSL) model, which has been successfully used for structural characterization of grain boundaries in materials with relatively simple crystal structures, mostly cubic systems. In this paper, a method for determining coincidence rotations in orthorhombic systems is given. This method is based on the vector-quaternion algorithm which is very close to the quadruple algorithm developed by Grimmer and used.
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