报告题目：旋进电子衍射及其在材料科学中的应用
报告题目(英文)：Precession electron diffraction and its applications in materials science
报告人姓名：稽罡研究员
报告时间：2015-10-22 09:30
报告地点：延长校区日新楼410室
报告内容简介：A double conical beam-rocking system, so-called precession electron diffraction (PED), or simply electron precession, was initially proposed by Vincent and Midgley in 1994 [1]. Over recent years, the application of this new technique has attracted more and more interest following the availability of commercial equipments being compatible with analytical transmission electron microscopes. In comparison with conventional diffraction techniques, such as microdiffraction, PED shows some significant advantages: (I) Integrated intensities of the reflections present in a PED pattern can be taken into account, while only positions of the reflections are available for a conventional diffraction pattern. (II) PED allows collection of more reflections than with conventional diffraction. (III) Dynamical effects are reduced by the off-axis beam inclination and few beam conditions are encountered so that the kinematical forbidden reflections can be identified. (IV) Indexing of a PED pattern can be done in the usual way. (V) There is no need for perfect zone axis orientation during recording of a PED pattern. This talk presents electron ray-paths of the PED technique and interprets the formation of a PED pattern using the Ewald sphere. Some practical applications of this technique in materials science for determining twin laws, ‘ideal’ symmetry, state of order, space groups and for identifying (new) phases are also addressed [2-10].
报告人简介(中文)：嵇罡博士在1992-1999年间在上海大学(延长路校区)完成本科和硕士的学习；1999-2003年间在法国贝尔福–蒙博里亚工程技术大学攻读并取得工程材料学博士学位；从2008年起在法国里尔第一大学工作，担任法国国家科学研究中心研究员终身职位；2012年通过博导资格答辩并提升为资深研究员。2014年起受聘为上海交通大学金属基复合材料国家重点实验室客座教授。西澳大利亚大学,比利时安特卫普大学高级访问学者。他的主要科研方向有先进功能及结构材料的制备,结构及界面表征；透射电子显微术,电子晶体学,电子衍射技术。
报告人单位(中文)：法国里尔第一大学
报告人单位(英文)：Université Lille 1, France
