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Quantitative Differences in the Y Grain Boundary Excess at Boundaries Delimiting Large and Small Grains in Y Doped Al2O3
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2017-11-06 , DOI: 10.1016/j.jeurceramsoc.2017.11.006
Hadas Sternlicht , Stephanie A. Bojarski , Gregory S. Rohrer , Wayne D. Kaplan

The chemical excess at high angle grain boundaries in yttrium doped alumina was characterized using transmission electron microscopy and energy dispersive spectroscopy. The sample had a bimodal microstructure and one explanation for the fast growth of some grains was that they were surrounded by boundaries with a different yttrium grain boundary excess than the smaller grains. The amount of yttrium at boundaries between grains of similar and different sizes was quantified. Boundaries between smaller grains and between small grains bonded to sapphire had a mean Y excess of 1.3 atoms/nm2. The grain boundary excess of Y for boundaries delimiting large grains had either a lower Y content of 0.5 atoms/nm2 and 0.9 atoms/nm2, or a higher Y content of 1.6 atoms/nm2, consistent with the idea that these boundaries had a different composition and thus different complexions.



中文翻译:

Y掺杂Al 2 O 3中大晶粒和小晶粒的边界处,Y晶粒边界的数量差异。

使用透射电子显微镜和能量色散光谱对掺钇的氧化铝中大角度晶界处的化学过量进行了表征。该样品具有双峰微观结构,某些晶粒快速生长的一个解释是,它们被边界所包围,钇晶界过量的边界不同于较小晶粒。定量了相似大小和不同大小的晶粒之间的边界处的钇含量。较小的晶粒之间以及与蓝宝石键合的小晶粒之间的边界的平均Y超出1.3个原子/ nm 2。边界较大的晶界中Y的晶界过量具有较低的Y含量(0.5个原子/ nm 2和0.9个原子/ nm 2)或较高的Y含量(1.6个原子/ nm)如图2所示,这与这些边界具有不同的组成并因此具有不同的肤色的想法相一致。

更新日期:2017-11-10
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