Ferreira Sanchez Dario, Villanova Julie, Laurencin Jérôme, Micha Jean-Sébastien, Montani Alexandre, Gergaud Patrice, Bleuet Pierre
Université Grenoble Alpes , Grenoble, F-38000, France ; CEA/LETI , MINATEC Campus, Grenoble, F-38054, France.
ESRF , Grenoble, France.
J Appl Crystallogr. 2015 Feb 21;48(Pt 2):357-364. doi: 10.1107/S1600576715002447. eCollection 2015 Apr 1.
The relevance of micro Laue diffraction tomography (µ-LT) to investigate heterogeneous polycrystalline materials has been studied. For this purpose, a multiphase solid oxide fuel cell (SOFC) electrode composite made of yttria-stabilized zirconia and nickel oxide phases, with grains of about a few micrometres in size, has been analyzed. In order to calibrate the Laue data and to test the technique's sensitivity limits, a monocrystalline germanium sample of about 8 × 4 µm in cross-section size has also been studied through µ-LT. The SOFC and germanium Laue diffraction pattern analyses are compared and discussed. The indexing procedure has been successfully applied for the analysis of the germanium Laue data, and the depth-resolved two-dimensional cartographies of the full deviatoric strain tensor components were obtained. The development and application of an original geometrical approach to analyze the SOFC Laue data allowed the authors to resolve grains with sizes of about 3 µm and to identify their individual Laue patterns; by indexing those Laue patterns, the crystalline phases and orientations of most of the grains identified through the geometrical approach could be resolved.
研究了微劳厄衍射层析成像（µ-LT）在研究多相多晶材料方面的相关性。为此，分析了一种由氧化钇稳定的氧化锆和氧化镍相组成的多相固体氧化物燃料电池（SOFC）电极复合材料，其晶粒尺寸约为几微米。为了校准劳厄数据并测试该技术的灵敏度极限，还通过µ-LT研究了一个横截面尺寸约为8×4 µm的单晶锗样品。对SOFC和锗的劳厄衍射图案分析进行了比较和讨论。索引程序已成功应用于锗劳厄数据的分析，并获得了全偏应变张量分量的深度分辨二维图谱。一种用于分析SOFC劳厄数据的原始几何方法的开发和应用，使作者能够分辨出尺寸约为3 µm的晶粒，并识别出它们各自的劳厄图案；通过对这些劳厄图案进行索引，可以解析通过几何方法识别出的大多数晶粒的晶相和取向。
