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NIST/Sandia/ICDD Electron Diffraction Database: A Database for Phase Identification by Electron Diffraction

机译:NIST / Sandia / ICDD电子衍射数据库:通过电子衍射进行相识别的数据库

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摘要

A new database containing crystallographic and chemical information designed especially for application to electron diffraction search/match and related problems has been developed. The new database was derived from two well-established x-ray diffraction databases, the JCPDS Powder Diffraction File and NBS CRYSTAL DATA, and incorporates 2 years of experience with an earlier version. It contains 71,142 entries, with space group and unit cell data for 59,612 of those. Unit cell and space group information were used, where available, to calculate patterns consisting of all allowed reflections with d-spacings greater than 0.8 A for ~ 59,000 of the entries. Calculated patterns are used in the database in preference to experimental x-ray data when both are available, since experimental x-ray data sometimes omits high d-spacing data which falls at low diffraction angles. Intensity data are not given when calculated spacings are used. A search scheme using chemistry and r-spacing (reciprocal d-spacing) has been developed. Other potentially searchable data in this new database include space group, Pearson symbol, unit cell edge lengths, reduced cell edge length, and reduced cell volume. Compound and/or mineral names, formulas, and journal references are included in the output, as well as pointers to corresponding entries in NBS CRYSTAL DATA and the Powder Diffraction File where more complete information may be obtained. Atom positions are not given. Rudimentary search software has been written to implement a chemistry and r-spacing bit map search. With typical data, a full search through ~ 71,000 compounds takes 10~20 seconds on a PDP 11/23-RL02 system.
机译:已经建立了一个新的数据库,其中包含专门用于电子衍射搜索/匹配和相关问题的晶体学和化学信息。新的数据库来自两个公认的X射线衍射数据库,即JCPDS粉末衍射文件和NBS晶体数据,并结合了2年的早期版本经验。它包含71,142个条目,其中有59,612个条目具有空间组和单位单元数据。在可能的情况下,使用晶胞和空间群信息来计算模式,该模式包括约59,000个条目的d间隔大于0.8 A的所有允许反射。当两者均可用时,优先使用数据库中的计算模式而不是实验X射线数据,因为实验X射线数据有时会忽略掉落在低衍射角的高d间距数据。使用计算出的间距时不会给出强度数据。已经开发出使用化学和r间距(倒数d间距)的搜索方案。此新数据库中的其他可能可搜索的数据包括空间组,皮尔逊符号,单位像元边缘长度,减少的像元边缘长度和减少的像元体积。在输出中包括化合物和/或矿物名称,配方和日记本参考,以及指向NBS晶体数据和粉末衍射文件中相应条目的指针,可在其中获得更完整的信息。没有给出原子位置。编写了基本搜索软件以实现化学和r间距位图搜索。根据典型数据,在PDP 11 / 23-RL02系统上,要全面搜索约71,000种化合物需要10〜20秒。

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