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Yoshinori Tokuda Takeshi Irimoto Naoki Nishikawa Yutaro Katsuyama Shunsuke Kobayashi Tomoharu Tokunaga Takahisa Yamamoto 《Surface and interface analysis : SIA》2022,54(3):212-217
Herein, we investigated the surface of an (La0.3Sr0.7)(Al0.65Ta0.35)O3 (LSAT) single crystal via scanning transmission electron microscopy (STEM) after annealing in air. We found amorphous mounds and atomically flat surfaces formed on the surface of the (100) LSAT single crystal subsequent to heat treatment. These surface mounds mainly constituted SrO, including ~50 at.% Al. The atomically flat surface showed a B-site termination determined by the direct surface observation at the atomic scale through HAADF-STEM. The atomic arrangements on the surface were accommodated by surface-mound formation and La evaporation. Consequently, the ordered structure disappeared because of the increase in the Ta content at the terminated B-site layer. 相似文献
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