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Domain wall conduction in bismuth ferrite
Published on Jan 16, 20173305 Views
Ferroelectric bismuth ferrite has been extensively studied as a candidate material for high-temperature piezoelectric devices. One of the drawbacks of this material is its high electrical conductivity
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Domain wall conduction in bismuth ferrite00:00
Ferroelectric ceramic materials03:33
Why are domain walls (DWs) so important?08:13
Electrical conduction at DWs13:26
Conductive domain walls in bulk BiFeO316:11
Where does the conductivity come from?18:39
Atomic-scale STEM20:16
Evidence of defect accumulation at DWs21:34
Defect chemistry of BiFeO324:18
Control of DW conductivity by p(O2)26:30
Summary and conclusions27:34
Arm28:19
Scanning transmission electron microscope29:10
Jeol arm 2000 FC30:45
Quantification31:01
Citation-ware awailable software31:40
Background32:26
Position33:44
Local maxima, centre of gravity34:36
Distances, angles34:57
B-cation shifts accuracy35:29
BiFeO336:00
Low-angle annular-dark-field imaging (LAADF)36:31
Electron energy loss spectroscopy37:41
Ultramicroscopy38:31
EELS standard for Fe4+40:33
Energy onset difference41:07
EELS of Bi41:28
Determination of column intensities42:06
Intensity as a function of chemical composition43:18
Determination of Bi vacancies44:55
Calculations using STEM45:11
The intensity ratio45:52
Accumulation of charged defects46:10
No Bi vacancies, no Fe47:40
Future work48:29
Nature materials56:22