Direct Observation of Oxygen Vacancy Distribution across Yttria-Stabilized Zirconia Grain Boundaries

被引:70
作者
Feng, Bin [1 ]
Lugg, Nathan R. [1 ]
Kumamoto, Akihito [1 ]
Ikuhara, Yuichi [1 ,2 ]
Shibata, Naoya [1 ,2 ]
机构
[1] Univ Tokyo, Inst Engn Innovat, Bunkyo Ku, 2-11-16 Yayoi, Tokyo 1138656, Japan
[2] Japan Fine Ceram Ctr, Nanostruct Res Lab, Atsuta Ku, 2-4-1 Mutsuno, Nagoya, Aichi 4568587, Japan
基金
日本学术振兴会;
关键词
grain boundaries; yttria-stabilized zirconia (YSZ); STEM-EDS; oxygen vacancy; interface chemistry; SOLUTE SEGREGATION BEHAVIOR; DISLOCATION CORES; CUBIC-ZIRCONIA; ION CONDUCTION; THIN SPECIMENS; TILT; SUPERCONDUCTORS; DIFFUSION; TRANSPORT; CRYSTALS;
D O I
10.1021/acsnano.7b05943
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Crystalline interfaces in materials often govern the macroscopic functional properties owing to their complex structure and chemical inhomogeneity. For ionic crystals, however, such understanding has been precluded by the debatable local anion distribution across crystal interfaces. In this study, using yttria-stabilized zirconia as a model material, the oxygen vacancy distribution across individual grain boundaries was directly quantified by atomic-resolution scanning transmission electron microscopy with ultrahigh-sensitive energy-dispersive X-ray spectroscopy. Combined with dynamical scattering calculations, we unambiguously show that the relative oxygen concentrations increase in four high-angle grain boundaries, indicating that the oxygen vacancies are actually depleted near the grain boundary cores. These results experimentally evidence that the long-range electric interaction is the dominant factor to determine the local point defect distribution at ionic crystal interfaces.
引用
收藏
页码:11376 / 11382
页数:7
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