Polarity determination of ferroelectric LiNbO{sub 3} crystals and BiFeO{sub 3} thin films by the convergent beam electron diffraction technique

The applicability of various convergent beam electron diffraction (CBED) methods to the polarity determination of LiNbO{sub 3} crystals in the space group R3c was examined. We show that the method of zone-axis CBED combined with dynamical simulation is applicable to the polarity determination of LiN...

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Bibliographic Details
Published inMaterials characterization Vol. 61; no. 9
Main Authors Guo Chao, Centre for Electron Microscopy, Wuhan University, Wuhan 430072, Zou Huamin, Pu Shizhou, Li Meiya, Cao Jiefeng
Format Journal Article
LanguageEnglish
Published United States 15.09.2010
Subjects
BISMUTH COMPOUNDS
COMPUTERIZED SIMULATION
CRYSTALS
ELECTRON BEAMS
ELECTRON DIFFRACTION
ENERGY BEAM DEPOSITION
FERRITES
FERROELECTRIC MATERIALS
LASER RADIATION
LITHIUM COMPOUNDS
MATERIALS SCIENCE
NIOBATES
PULSED IRRADIATION
SILICON OXIDES
SUBSTRATES
THIN FILMS
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
TRIGONAL LATTICES
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Summary:The applicability of various convergent beam electron diffraction (CBED) methods to the polarity determination of LiNbO{sub 3} crystals in the space group R3c was examined. We show that the method of zone-axis CBED combined with dynamical simulation is applicable to the polarity determination of LiNbO{sub 3}. The effects of the zone axis, the specimen thickness and the displacement of the homopolar atom on the polarity determination were studied. This method was also successfully applied to the polarity determination of a multiferroic BiFeO{sub 3} film deposited on a (111)Pt/TiO{sub 2}/SiO{sub 2}/Si substrate by pulsed laser deposition. It shows that about 30% of the grains in the BiFeO{sub 3} film are grown along the positive polar direction.
ISSN:1044-5803
1873-4189
DOI:10.1016/J.MATCHAR.2010.05.008