晶界
原子单位
钇
材料科学
氧化钇稳定氧化锆
化学物理
光谱学
立方氧化锆
氧化物
冶金
陶瓷
化学
微观结构
物理
量子力学
作者
Bin Feng,Tatsuya Yokoi,Akihito Kumamoto,Masato Yoshiya,Yuichi Ikuhara,Naoya Shibata
摘要
Grain boundary segregation is a critical issue in materials science because it determines the properties of individual grain boundaries and thus governs the macroscopic properties of materials. Recent progress in electron microscopy has greatly improved our understanding of grain boundary segregation phenomena down to atomistic dimensions, but solute segregation is still extremely challenging to experimentally identify at the atomic scale. Here, we report direct observations of atomic-scale yttrium solute segregation behaviours in an yttria-stabilized-zirconia grain boundary using atomic-resolution energy-dispersive X-ray spectroscopy analysis. We found that yttrium solute atoms preferentially segregate to specific atomic sites at the core of the grain boundary, forming a unique chemically-ordered structure across the grain boundary. Solute segregation is challenging to experimentally identify at the atomic scale. Here, the authors report the direct observation of atomic site-dependent solute segregation behaviour in an yttria-stabilized zirconia grain boundary by atomic-resolution energy-dispersive X-ray spectroscopy.
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