scholarly journals Direct observation of ferroelectric domain switching in varying electric field regimes using in situ TEM

Micron ◽  
2012 ◽  
Vol 43 (11) ◽  
pp. 1121-1126 ◽  
Author(s):  
C.R. Winkler ◽  
A.R. Damodaran ◽  
J. Karthik ◽  
L.W. Martin ◽  
M.L. Taheri
Keyword(s):  
Electric Field ◽  
Direct Observation ◽  
Domain Switching ◽  
Ferroelectric Domain ◽  
In Situ Tem

Direct Observation of Ferroelectric Domain Switching of BaTiO3 Using In-Situ Transmission Electron Microscopy

2016 ◽  
Vol 8 (12) ◽  
pp. 2281-2285 ◽  
Author(s):  
Kuy-Jin Jo ◽  
Byeong-Seon An ◽  
Tae-Hoon Kim ◽  
Hyun-Woo Cha ◽  
Jin-Su Oh ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Direct Observation ◽  
Domain Switching ◽  
Ferroelectric Domain ◽  
Transmission Electron

In situ observation of the motion of ferroelectric domain walls in Bi4Ti3O12 single crystals

2016 ◽  
Vol 49 (5) ◽  
pp. 1645-1652 ◽  
Author(s):  
Wanneng Ye ◽  
Lingli Tang ◽  
Chaojing Lu ◽  
Huabing Li ◽  
Yichun Zhou
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Single Crystals ◽  
Transmission Electron Microscope ◽  
Domain Walls ◽  
Domain Switching ◽  
Ferroelectric Domain ◽  
In Situ Observation ◽  
Transmission Electron

Five types of ferroelectric domain walls (DWs) are present in Bi4Ti3O12 single crystals (Ye et al., 2015). Here their motion was investigated in situ using transmission electron microscopy and optical microscopy. The motion of P (a)-90° DWs, P (a)-180° DWs and P (c)-180° DWs was observed through electron beam poling in a transmission electron microscope. The growth of new P s(a)-180° nanodomains was frequently seen and they tended to nucleate at preexisting P s(a)-90° DWs. Irregularly curved P (c)-180° DWs exhibit the highest mobility, while migration over a short range occurs occasionally for faceted P s(a)-90° DWs. In addition, the motion of P s(a)-90° DWs and the growth/annihilation of new needle-like P s(a)-90° domains in a 20 µm-thick crystal were observed under an external electric field on an optical microscope. Most of the new needle-like P s(a)-90° domains nucleate at preexisting P s(a)-90° DWs and the former are much smaller than the latter. This is very similar to the situation for P s(a)-180° domain switching induced by electron beam poling in a transmission electron microscope. Our observations suggest the energy hierarchy for different domains of P s(c)-180° ≤ P s(a)-180° ≤ P s(a)-90° ≤ new needle-like P s(a)-90° in ferroelectric Bi4Ti3O12.

scholarly journals Direct Observation of the Effects of Alloying Additions on Transformation Mechanisms in Emerging Steel Alloys with In-Situ TEM

2009 ◽  
Vol 15 (S2) ◽  
pp. 704-705
Author(s):  
M Hartshorne ◽  
E Toby ◽  
P Uranga ◽  
M Schmidt ◽  
P Novotny ◽  
...  
Keyword(s):  
Direct Observation ◽  
In Situ Tem ◽  
Steel Alloys ◽  
Alloying Additions ◽  
Transformation Mechanisms

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

In-Situ TEM Observation of Physical Degradation of AlGaN/GaN Devices under Applied Electric Field

2012 ◽  
Vol 18 (S2) ◽  
pp. 1872-1873 ◽  
Author(s):  
H. Ghassemi ◽  
A. Lang ◽  
M. Taheri
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
In Situ Tem ◽  
Physical Degradation

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

Displacement Charge Patterns and Ferroelectric Domain Wall Dynamics Studied by In-Situ Tem

1999 ◽  
Vol 596 ◽  
Author(s):  
A. Krishnan ◽  
M. M. J. Treacy ◽  
M. E. Bisher ◽  
P. Chandra ◽  
P. B. Littlewood
Keyword(s):  
Electric Fields ◽  
Domain Walls ◽  
Energy State ◽  
Ferroelectric Domain ◽  
Potassium Niobate ◽  
In Situ Tem ◽  
Domain Wall Dynamics ◽  
Transmission Electron ◽  
Energy Domain

AbstractWe have observed the growth of domains in ferroelectric barium titanate and potassium niobate using a transmission electron microscope. When domains move in response to electric fields we see a scaling effect where the fine scale domain structure is activated first, followed by larger length-scale patterns. Curvature and tilting of domain walls leads to local uncompensated displacement charge and external fields can interact with these charged walls. In this paper, we posit that the presence of displacement charge on domain walls is important for polarization switching. Charge-neutral domain configurations are in a lower energy state and are harder to switch. We argue that the number of charge-neutral, low energy domain configurations can increase with time. This mechanism provides an intrinsic contribution to ferroelectric fatigue.

Direct observation of monoclinic ferroelectric phase and domain switching process in (K0.25Na0.75)NbO3 single crystals

CrystEngComm ◽  
2015 ◽  
Vol 17 (14) ◽  
pp. 2872-2877 ◽  
Author(s):  
Hao Deng ◽  
Haiwu Zhang ◽  
Xiangyong Zhao ◽  
Chao Chen ◽  
Xi'an Wang ◽  
...  
Keyword(s):  
Light Microscopy ◽  
Single Crystals ◽  
Direct Observation ◽  
Ferroelectric Phase ◽  
Domain Switching ◽  
Polarized Light ◽  
Switching Process ◽  
X Ray Diffraction ◽  
X Ray

The domain-switching process of monoclinic K0.25Na0.75NbO3 single crystals were studied by in situ polarized light microscopy and X-ray diffraction.

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