Nanoscale chemistry and ion segregation in zirconia-based ceramic at grain boundaries by atom probe tomography
Nanoscale chemistry and ion segregation in zirconia-based ceramic at grain boundaries by atom probe tomography
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DOI：
10.1016/j.scriptamat.2022.114603
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发表时间：
2022-02-17
影响因子：
6
通讯作者：
Mazumder, Baishakhi
中科院分区：
文献类型：
--
作者：
Licata, Olivia G.;Zhu, Menglin;Mazumder, Baishakhi
在这项工作中，氧化钇稳定的四氧化锆（Y-TZP）的稳定性的重要性的纳米尺度的功能，通过原子探针断层扫描进行量化。晶界化学的深入分析揭示了更轻和更小的离子向特定晶界的优先偏析。元素偏析和局部原子结构之间的关系进行了研究，在亚纳米级的四方-单斜相转变，在Y-TZP通过晶界表征相关的纳米级功能的见解。实施主成分分析，以揭示任何潜在的偏见，从不同的领域蒸发跨稳定剂丰富的晶界。观察到的不同颗粒之间离子密度的变化表明场的变化，这归因于颗粒晶体取向的潜在变化。为了揭示晶粒边界内氧原子的细微损耗，提出了一种新的方法来映射氧空位，利用单个钇原子的相对邻域化学。
In this work nanoscale features that are of importance in the stability of yttria-stabilized tetragonal zirconia (Y-TZP) are quantified through atom probe tomography. In-depth analysis of grain boundary chemistry revealed preferential segregation of lighter and smaller ions towards specific grain boundaries. The relationship between elemental segregation and the local atomistic structure is investigated at the sub-nanometer level to gain insights on nanoscale features associated with the tetragonal-monoclinic phase transformation in Y-TZP through grain boundary characterization. Principal component analysis was implemented to reveal any potential biases from varied field evaporation across stabilizer-rich grain boundaries. The observed variations in ion density across different grains suggested a variation in field which was attributed to potential variations in grain crystal orientation. In order to reveal the subtle depletion of oxygen atoms within grain boundaries a new methodology to map oxygen vacancies is proposed, utilizing the relative neighborhood chemistry of individual yttrium atoms.