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通过电子背散射衍射（EBSD）分析的YO-AlO微球结晶。

YO-AlO microsphere crystallization analyzed by electron backscatter diffraction (EBSD).

作者信息

Wisniewski Wolfgang, Švančárek Peter, Prnová Anna, Parchovianský Milan, Galusek Dušan

机构信息

Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50, Trenčín, Slovakia.

Joint Glass Centre of the IIC SAS, TnU AD, and FChFT STU, Študentská 2, 911 50, Trenčín, Slovakia.

出版信息

Sci Rep. 2020 Jul 6;10(1):11122. doi: 10.1038/s41598-020-67816-7.

DOI:10.1038/s41598-020-67816-7
PMID:32632218
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7338460/
Abstract

The crystallization of glass microspheres in the YO-AlO-system produced from precursor powders of four different nominal compositions via flame synthesis is analyzed in detail by electron microscopy with a focus on electron backscatter diffraction (EBSD). Growth models are formulated for individual microspheres crystallized during flame synthesis as well as after an additional heat treatment step. 16 different types of crystallized bodies are cataloged for future reference. They are presented without regard for their relative occurrence; some are extremely rare but illustrate the possibilities of flame synthesis in the analyzed system. All three phases in the binary YO-AlO-phase diagram (YAlO, YAlO and YAlO) and α-alumina are located by EBSD. Energy dispersive X-ray spectrometry results obtained from these microspheres show that their chemical composition can deviate from the nominal composition of the precursor powder. The multitude of differing microsphere types showing polygon and dendritic crystal growth as well as phase separation indicate that flame synthesis can lead to a wide variety of parameters during microsphere production, e.g. via irregular flight paths through the flame, contaminants or irregular cooling rates.

摘要

通过电子显微镜，重点是电子背散射衍射（EBSD），详细分析了由四种不同标称组成的前驱体粉末通过火焰合成制备的YO-AlO系统中玻璃微球的结晶情况。针对火焰合成过程中以及额外热处理步骤后结晶的单个微球，制定了生长模型。记录了16种不同类型的结晶体以供将来参考。呈现这些结晶体时不考虑它们的相对出现频率；有些极其罕见，但说明了所分析系统中火焰合成的可能性。通过EBSD确定了二元YO-AlO相图中的所有三个相（YAlO、YAlO和YAlO）以及α-氧化铝。从这些微球获得的能量色散X射线光谱结果表明，它们的化学成分可能与前驱体粉末的标称组成有所偏差。众多呈现多边形和树枝状晶体生长以及相分离的不同微球类型表明，火焰合成在微球生产过程中可能导致各种各样的参数变化，例如通过火焰的不规则飞行路径、污染物或不规则冷却速率。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/43f3e1f184aa/41598_2020_67816_Fig19_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/1fe0cc2f7dc2/41598_2020_67816_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/29c06cfbb593/41598_2020_67816_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/a6fb2962f14b/41598_2020_67816_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/b63e52e083c1/41598_2020_67816_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/fcc02fb15ff0/41598_2020_67816_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/054b8b5b8420/41598_2020_67816_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3425/7338460/ec7169b3a08a/41598_2020_67816_Fig14_HTML.jpg
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