TY  - JOUR
AU  - MacLaren, Ian
AU  - Wang, LiQiu
AU  - McGrouther, Damien
AU  - Craven, Alan J.
AU  - McVitie, Stephen
AU  - Schierholz, Roland
AU  - Kovács, András
AU  - Barthel, Juri
AU  - Dunin-Borkowski, Rafal
TI  - On the origin of differential phase contrast at a locally charged and globally charge-compensated domain boundary in a polar-ordered material
JO  - Ultramicroscopy
VL  - 154
SN  - 0304-3991
CY  - Amsterdam
PB  - Elsevier Science
M1  - FZJ-2015-02428
SP  - 57 - 63
PY  - 2015
AB  - Differential phase contrast (DPC) imaging in the scanning transmission electron microscope is applied to the study of a charged antiphase domain boundary in doped bismuth ferrite. A clear differential signal is seen, which matches the expected direction of the electric field at the boundary. However, further study by scanned diffraction reveals that there is no measurable deflection of the primary diffraction disc and hence no significant free E-field in the material. Instead, the DPC signal arises from a modulation of the intensity profile within the primary diffraction disc in the vicinity of the boundary. Simulations are used to show that this modulation arises purely from the local change in crystallographic structure at the boundary and not from an electric field. This study highlights the care that is required when interpreting signals recorded from ferroelectric materials using both DPC imaging and other phase contrast techniques.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000355018700009
DO  - DOI:10.1016/j.ultramic.2015.03.016
UR  - https://juser.fz-juelich.de/record/189240
ER  -