Spontaneous formation of circular and vortex ferroelectric domain structure in hexagonal YMnO3 and YMn0.9Fe0.1O3 prepared by low temperature solution synthesis

被引：14
作者：
Harunsani, M. H. [1 ]
Li, J. [2 ]
Qin, Y. B. [2 ]
Tian, H. T. [2 ]
Li, J. Q. [2 ]
Yang, H. X. [2 ]
Walton, R. I. [1 ]
机构：
[1] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England
[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2015年 / 107卷 / 06期
关键词：
HYDROTHERMAL SYNTHESIS; PEROVSKITE MANGANITES; MAGNETISM; TOPOLOGY; WALLS;
D O I：
10.1063/1.4928565
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report an experimental study of the domain structure of ferroelectric YMnO3 and YMn0.9Fe0.1O3 using polycrystalline samples prepared by direct hydrothermal crystallisation at 240 degrees C, well below their structural phase transition temperatures. Powder X-ray diffraction shows the expected P6(3)cm space group for both samples with an increase in a and a small decrease in c with Fe incorporation, consistent with an adjustment of MnO5 tilting, while XANES spectra at the Mn and Fe K edges show the oxidation state of both metals are maintained at +3 in the doped sample. High resolution TEM shows that curved stripe, annular and vortex domains can all be observed in the YMnO3 crystals, proving that the structural phase transition is not the only driving force for the occurrence of the annular and vortex domains. Furthermore, the absence of the annular and vortex domains in YMn0.9Fe0.1O3 indicates that the tilting state of MnO5 bipyramids plays an important role in the domain formation. Atomic resolution STEM images confirm that the ferroelectric domain walls correspond to structural antiphase boundaries similar to the crystals made via high temperature solid-state reactions. (C) 2015 AIP Publishing LLC.
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页数：5
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