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首页> 外文期刊>Crystal growth & design >Surface crystallization of fresnoite from a glass studied by hot stage scanning electron microscopy and electron backscatter diffraction
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Surface crystallization of fresnoite from a glass studied by hot stage scanning electron microscopy and electron backscatter diffraction

机译：通过热台扫描电子显微镜和电子背散射衍射研究了玻璃中的贝氏体表面结晶

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摘要

Polished pieces of a glass with the composition 2BaO·TiO _2·2.75SiO_2 (fresnoite + 0.75SiO_2) were annealed at 790-970 C and subsequently analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) including electron backscatter diffraction (EBSD). Surface morphologies and textures of samples annealed in a normal furnace are presented. While the texture of oriented nucleation occurs over the entire temperature range, the development of previously undetected secondary textures is described and explained. In-situ high temperature video sequences visualize the growth and a two-step nucleation of fresnoite. The velocity of crystal growth along the surface in the vacuum is measured and compared to the mean velocity of three-dimensional crystal growth in an ambient atmosphere. For example, growth velocities along the surface reach 3.6 μm/min in the vacuum at 830 C compared to 0.16 μm/min during growth into the bulk.
机译：将组成为2BaO·TiO _2·2.75SiO_2（铬铁矿+ 0.75SiO_2）的玻璃抛光片在790-970 C退火，然后使用X射线衍射（XRD）和包括电子背散射衍射的扫描电子显微镜（SEM）进行分析（EBSD）。介绍了在普通炉中退火的样品的表面形态和织构。尽管定向成核的织构在整个温度范围内发生，但仍在描述和解释了先前未发现的次级织构的发展。原位高温视频序列可视化了维氏体的生长和两步成核作用。测量在真空中沿着表面的晶体生长的速度，并将其与周围大气中三维晶体生长的平均速度进行比较。例如，在830°C的真空中，沿着表面的生长速度达到3.6μm/ min，而在成块时则为0.16μm/ min。

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