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

DOI: 10.1063/1.4928565 DOI Help

Authors: M. H. Harunsani (University of Warwick) , J. Li (Chinese Academy of Sciences) , Y. B. Qin (Chinese Academy of Sciences) , H. T. Tian (Chinese Academy of Sciences) , J. Q. Li (Chinese Academy of Sciences) , H. X. Yang (Chinese Academy of Sciences) , R Walton (University of Warwick)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Applied Physics Letters , VOL 107 (6) , PAGES 1372-1378

State: Published (Approved)
Published: August 2015
Diamond Proposal Number(s): 8189

Abstract: 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 °C, well below their structural phase transition temperatures. Powder X-ray diffraction shows the expected P63 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.

Subject Areas: Physics, Chemistry, Materials

Instruments: B18-Core EXAFS

Added On: 12/10/2015 07:34

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