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首页> 外文期刊>Contributions to Mineralogy and Petrology >Grain boundary and volume diffusion experiments in yttrium aluminium garnet bicrystals at 1,723 K: a miniaturized study
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Grain boundary and volume diffusion experiments in yttrium aluminium garnet bicrystals at 1,723 K: a miniaturized study

机译：钇铝石榴石双晶在1,723 K时的晶界和体积扩散实验：小型化研究

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摘要

Yb-Y inter-diffusion along a single grain boundary of a synthetic yttrium aluminium garnet (YAG) bicrystal has been studied using analytical transmission electron microscopy (ATEM). To investigate the diffusion, a thin-film containing Yb as the diffusant was deposited perpendicular to the bicrystal grain boundary by pulsed laser deposition (PLD). Structural properties and their change with time in both the diffusant source and the grain boundary are reported. The diffusion profiles are incorporated in a numerical diffusion model, which is applied to determine the grain boundary diffusion coefficient, D_(gb), at 1.723 K it is equal to 3 x 10~(-15) m~2/s. We find that grain boundary diffusion is 4.85 orders of magnitude faster than volume diffusion, which was determined from the same diffusion experiment. This result is discussed in the context of special versus general grain boundaries. Finally, we successfully tested the capability of synchrotron-based nano-X-ray fluorescence analysis to map micro-chemical patterns in two dimensions with sub-micrometre resolution.
机译：使用分析型透射电子显微镜（ATEM）研究了沿合成钇铝石榴石（YAG）双晶单晶边界的Yb-Y相互扩散。为了研究扩散，通过脉冲激光沉积（PLD）垂直于双晶晶界沉积包含Yb作为扩散剂的薄膜。报告了扩散源和晶界的结构特性及其随时间的变化。将扩散分布图合并到数值扩散模型中，该模型用于确定晶粒边界扩散系数D_（gb）在1.723 K时等于3 x 10〜（-15）m〜2 / s。我们发现，晶界扩散比体积扩散快4.85个数量级，而体积扩散是由相同的扩散实验确定的。在特殊和一般晶界的背景下讨论了这个结果。最后，我们成功地测试了基于同步加速器的纳米X射线荧光分析功能，能够绘制亚微米分辨率的二维微化学图案。

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