Farooq M U, Villaurrutia R, MacLaren I, Kungl H, Hoffmann M J, Fundenberger J-J, Bouzy E
Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
J Microsc. 2008 Jun;230(Pt 3):445-54. doi: 10.1111/j.1365-2818.2008.02004.x.
Reliable EBSD mapping of 90 degree domains in a tetragonal ferroelectric perovskite has been achieved for the first time, together with reliable automated orientation determination from TEM-Kikuchi patterns. This has been used to determine misorientation angles at 90 degree domain boundaries and thus local c/a ratios. The sources of orientation noise/error and their effects on the misorientation angle data have been thoroughly analyzed and it is found that this gives a cosine distribution of misorientation angles about the mean with a characteristic width related to the width of the orientation noise distribution. In most cases, a good agreement is found between local c/a ratios and global measurements by X-ray diffraction, but some clear discrepancies have also been found suggesting that real local variations are present, perhaps as a consequence of compositional inhomogeneities.
首次实现了对四方铁电钙钛矿中90度畴的可靠电子背散射衍射（EBSD）映射，同时还实现了从透射电子显微镜菊池花样中可靠地自动确定取向。这已被用于确定90度畴界处的取向差角，从而确定局部的c/a比。对取向噪声/误差的来源及其对取向差角数据的影响进行了全面分析，发现这给出了围绕平均值的取向差角的余弦分布，其特征宽度与取向噪声分布的宽度有关。在大多数情况下，局部c/a比与X射线衍射的整体测量结果吻合良好，但也发现了一些明显的差异，这表明可能存在实际的局部变化，也许是成分不均匀性的结果。
