In situ observation of correlations between domain switching and crack propagation in BaTiO3 single crystals under coupling of mechanical and electric loads

2014 ◽  
Vol 70 ◽  
pp. 47-50 ◽  
Author(s):  
Bing Jiang ◽  
Yang Bai ◽  
Meicheng Li ◽  
Trevor Mwenya
Keyword(s):  
Crack Propagation ◽  
Single Crystals ◽  
Domain Switching ◽  
In Situ Observation ◽  
Electric Loads

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.

In-situ observation of faceted growth of benzophenone single crystals

2014 ◽  
Vol 144 (3) ◽  
pp. 402-408 ◽  
Author(s):  
V. Natarajan ◽  
M. Arivanandhan ◽  
P. Anandan ◽  
K. Sankaranarayanan ◽  
G. Ravi ◽  
...  
Keyword(s):  
Single Crystals ◽  
In Situ Observation

Electric field-induced crack growth and domain-structure evolution for [100]- and [101]-oriented 72%Pb(Mg1/3Nb2/3) O3–28%PbTiO3 ferroelectric single crystals

2008 ◽  
Vol 23 (12) ◽  
pp. 3387-3395 ◽  
Author(s):  
F. Fang ◽  
W. Yang ◽  
F.C. Zhang ◽  
H. Qing
Keyword(s):  
Electric Field ◽  
Crack Propagation ◽  
Single Crystal ◽  
Single Crystals ◽  
Crack Growth ◽  
Domain Structure ◽  
Boundary Structure ◽  
Structure Evolution ◽  
In Situ Observation ◽  
Oriented Single Crystal

In situ observation of the electrically induced crack growth and domain-structure evolution is carried out for [100]- and [101]-oriented 72%Pb(Mg1/3Nb2/3)O3–28% PbTiO3 (PMN–PT 72/28) ferroelectric single crystals under static (poling) and alternating electric fields. On the same poling electric field, domains are in the stable engineered domain state where four equivalent polarization variants coexist for [100]-oriented single crystal, while parallel lines representing the 71° domain boundaries appear for [101]-oriented one. Under the same cyclic electric field, the [100]-oriented single crystal shows much higher crack propagation resistance than that of a [101]-oriented crystal. Apart from the material aspects, such as crystallographic fracture anisotropy and non-180° domain boundary structure, crack boundary condition plays an important role in determining the crack propagation behavior.

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