Epifluorescence microscopy study of a quadruple node of triple junctions of grain boundaries in a Eu2+-decorated highly textured composite of (Cl, Br)(K, Rb) and I(K, Rb) solid solutions

IF 1.5 4区 工程技术 Q3 MICROSCOPY Journal of microscopy Pub Date : 2024-06-20 DOI:10.1111/jmi.13341
A. E. Cordero-Borboa, R. Unda-Angeles
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Abstract

The structural nature and geometry, as well as the lattice-relative orientation, of an arrangement of crystal defects in a highly textured Eu2+-doped composite of two alkali-halide solid solutions was studied by epifluorescence microscopy (EFM) using the doping ion as a fluorochrome. A three-dimensional reconstruction and a skeleton type model, as built from a sequence of EFM images of different optical cross-sections of this arrangement, are presented. Structurally, this arrangement is a quadruple node (QN) of triple junctions of grain boundaries. The QN core geometry is that of a tetragonal tristetrahedron (TTTH), centred at the QN site, whose tetrahedron vertices and edges are on the QN triple junctions and grain boundaries, respectively, whereas the tristetrahedron tetragonal axis is nearly parallel to the lattice [001]-axis. The measured values of the angles between triple junctions and between the grain boundaries forming them are reported. The distinct chemical compositions of the composite solid solutions are discussed to be responsible, in last instance, for the tristetrahedron departure from a cubic configuration. Collaterally, certain families of translationally periodic almost-parallel (TPAP)-wall-like regions which consist of TPAP-columns of TPAP-spindle-like singularities, as well as certain zigzag arrays of columns of this like, existing into the QN grains, are reported to be observed. Three-dimensional reconstructions of typical individuals of these families and arrays as well as of their constituent parts are presented and geometrically analysed. These families and arrays are discussed to be families of tilt subboundaries, whose constituent dislocations are decorated by cylindrical second-phase europium di-halide precipitates, and regularly faceted tilt subboundaries, respectively. Crystal growing and sample preparation, composite structural characterisation by powder and single-slab X-ray diffraction (PXRD and SSXRD, respectively), microscopy and fluorescence-cube unit optics, image processing, electronic three-dimensional reconstruction and measuring methodologies, are all described in detail.

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对 Eu2+(Cl,Br)(K,Rb)和 I(K,Rb)固溶体的高纹理复合材料中晶界三重交界的四重节点的荧光显微镜研究。
通过外荧光显微镜(EFM),以掺杂离子为荧光色,研究了两种碱-卤化物固溶体的高纹理 Eu2+ 掺杂复合材料中晶体缺陷排列的结构性质和几何形状,以及晶格相关取向。本文介绍了根据这种排列的不同光学截面的一系列 EFM 图像建立的三维重建和骨架型模型。从结构上看,这种排列是晶界三重连接的四重节点(QN)。QN 核心的几何形状是一个以 QN 位点为中心的四角三四面体 (TTTH),其四面体顶点和边分别位于 QN 三交点和晶界上,而三四面体的四角轴几乎与晶格 [001] 轴平行。报告了三重连接之间以及形成三重连接的晶界之间角度的测量值。最后讨论了复合固溶体的不同化学成分是导致三重四面体偏离立方构型的原因。此外,报告还观察到某些平移周期性几乎平行(TPAP)的墙状区域,这些区域由 TPAP 柱状的 TPAP 纺锤状奇点组成,以及某些存在于 QN 晶粒中的类似柱状的之字形阵列。报告展示了这些系列和阵列的典型个体及其构成部分的三维重建,并对其进行了几何分析。这些系列和阵列分别被讨论为倾斜子边界系列(其组成位错由圆柱形第二相二卤化铕沉淀物装饰)和规则切面倾斜子边界。晶体生长和样品制备、通过粉末和单片 X 射线衍射(分别为 PXRD 和 SSXRD)进行的复合结构表征、显微镜和荧光立方体单元光学、图像处理、电子三维重建和测量方法都有详细介绍。
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来源期刊
Journal of microscopy
Journal of microscopy 工程技术-显微镜技术
CiteScore
4.30
自引率
5.00%
发文量
83
审稿时长
1 months
期刊介绍: The Journal of Microscopy is the oldest journal dedicated to the science of microscopy and the only peer-reviewed publication of the Royal Microscopical Society. It publishes papers that report on the very latest developments in microscopy such as advances in microscopy techniques or novel areas of application. The Journal does not seek to publish routine applications of microscopy or specimen preparation even though the submission may otherwise have a high scientific merit. The scope covers research in the physical and biological sciences and covers imaging methods using light, electrons, X-rays and other radiations as well as atomic force and near field techniques. Interdisciplinary research is welcome. Papers pertaining to microscopy are also welcomed on optical theory, spectroscopy, novel specimen preparation and manipulation methods and image recording, processing and analysis including dynamic analysis of living specimens. Publication types include full papers, hot topic fast tracked communications and review articles. Authors considering submitting a review article should contact the editorial office first.
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