Electron backscatter diffraction analysis and orientation mapping of monazite
Electron backscatter diffraction analysis and orientation mapping of monazite
复制标题
独居石的电子背散射衍射分析和取向图
DOI：
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发表时间：
2010
影响因子：
2.7
通讯作者：
B. Eglington
中科院分区：
文献类型：
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作者：
Steven M. Reddy;Chris Clark;N. Timms;B. Eglington
摘要独居石的电子背散射衍射(EBSD)分析需要将经验收集的电子背散射图案(EBSP)与根据已知晶体参数得出的理论衍射数据或匹配单位进行比较。从成分不同的天然独居石和合成独居石中获得的已发表的结晶学数据被用来计算独居石的十个不同的匹配单位。这些匹配单元被用来系统地索引从四个不同组成的天然独居石样品中获得的EBSP。对EBSD数据的分析表明，不同的匹配单元正确地索引不同的自然样品的能力有很大的差异。EBSD数据来自于使用10个匹配单元中的每一个对来自四个样品的10,000个EBSP的五个和六个衍射带进行索引。然而，使用来自合成Gd或Eu独居石晶体数据的匹配单位，对四个被分析的独居石中的三个产生了良好的结果。样品成分与已发表的独居石成分的对比表明，这些匹配单元很可能为变质独居石的EBSD分析提供良好的结果。这些结果为优化独居石EBSD数据的获取和分析提供了明确的策略，但也表明需要收集新的晶体结构数据，并随后生成更合适的天然独居石匹配单元。
Abstract Electron backscatter diffraction (EBSD) analysis of monazite requires a comparison of empirically collected electron backscatter patterns (EBSPs) with theoretical diffraction data, or ‘match units’, derived from known crystallographic parameters. Published crystallographic data derived from compositionally varying natural and synthetic monazite are used to calculate ten different match units for monazite. These match units are used to systematically index EBSPs obtained from four natural monazite samples with different compositions. Analyses of EBSD data, derived from the indexing of five and six diffraction bands using each of the ten match units for 10,000 EBSPs from each of the four samples, indicate a large variation in the ability of the different match units to correctly index the different natural samples. However, the use of match units derived from either synthetic Gd or Eu monazite crystallographic data yield good results for three of the four analysed monazites. Comparison of sample composition with published monazite compositions indicates that these match units are likely to yield good results for the EBSD analysis of metamorphic monazite. The results provide a clear strategy for optimizing the acquisition and analysis of EBSD data from monazite but also indicate the need for the collection of new crystallographic structure data and the subsequent generation of more appropriate match units for natural monazite.