Evidence for a surface anomaly during the cubic-tetragonal phase transition in BaTiO3(001)
Evidence for a surface anomaly during the cubic-tetragonal phase transition in BaTiO3(001)
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DOI：
10.1063/1.5030498
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发表时间：
2018-07-09
影响因子：
4
通讯作者：
Mathieu, C.
中科院分区：
文献类型：
--
作者：
Barrett, N.;Dionot, J.;Mathieu, C.
我们用低能电子显微镜（LEEM）研究了BaTiO_3（001）在铁电-顺电相变（120 ℃，P4 mm-Pm_3 m）过程中表面结构的演变。在略高于T-C的温度下加热时出现瞬态表面结构。极性畴壁和样品表面之间的交叉点在126.0摄氏度下持续存在于表面层中，而本体已经转化为立方相。壁信号由第二组条纹图案交叉，第二组条纹图案在126.3摄氏度下具有大致垂直的取向。这些表面图案在进一步加热至126.9摄氏度时变粗糙。LEEM图像在铁电状态下由铁弹性/铁电90度壁和表面的交叉点主导。交叉线带电。由AIP出版社出版。
We have used low energy electron microscopy (LEEM) to study the evolution of the surface structure of BaTiO3(001) during the ferroelectric-paraelectric phase transition (120 degrees C, P4mm-Pm3m). Transient surface structures appear under heating at temperatures slightly above T-C. Intersections between polar domain walls and the sample surface persist in the surface layer at 126.0 degrees C while the bulk has already transformed into the cubic phase. The wall signals are crisscrossed by a second set of stripe patterns with roughly perpendicular orientation at 126.3 degrees C. These surface patterns coarsen under further heating to 126.9 degrees C. The LEEM image is dominated in the ferroelectric state by intersections of ferroelastic/ferroelectric 90 degrees walls and the surface. The intersection lines are charged. Published by AIP Publishing.