scholarly journals Analysis of Switching Current Data during Polarization Reversal in KTP Single Crystals with Surface Dielectric Layer

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 315 ◽  
Author(s):  
Andrey Akhmatkhanov ◽  
Ekaterina Vaskina ◽  
Ekaterina Gachegova ◽  
Vladimir Shur
Keyword(s):  
Single Crystals ◽  
Dielectric Layer ◽  
Domain Walls ◽  
Current Data ◽  
Domain Growth ◽  
Structure Evolution ◽  
Polarization Reversal ◽  
Switching Current ◽  
In Situ Visualization

Studies of polarization reversal processes in potassium titanyl phosphate (KTiOPO4, KTP) single crystals with surface dielectric layer are important due to their potential applications as the basis of bottom-up technology for creation of periodically poled nonlinear-optical crystals. We present the results of switching currents analysis accompanied by in situ visualization of domain kinetics during polarization reversal in KTP with 3 m-thick photoresist dielectric layer. Qualitative change of the switching current shape has been revealed as compared to the polarization reversal without surface dielectric layer. Two stages of domain structure evolution have been distinguished by in situ visualization of domain kinetics. The formation of submicron domain streamers in front of the moving domain walls has been revealed. The broadening of the domain streamers (1D domain growth) was observed at the second stage. The switching currents were approximated by the modified Kolmogorov-Avrami formula taking into account the change of the growth dimensionality (“geometrical catastrophe”). The sufficient input of the 1D growth to the switching process decreased with increase of the switching field. The obtained results were attributed to the domain wall shape instability induced by retardation of the depolarization field screening in ferroelectric with surface dielectric layer.

Investigation of polarization reversal and analysis of switching current data in KTP single crystals

2017 ◽  
Vol 508 (1) ◽  
pp. 1-8 ◽  
Author(s):  
A. R. Akhmatkhanov ◽  
E. M. Vaskina ◽  
M. A. Chuvakova ◽  
E. V. Pelegova ◽  
V. Ya. Shur
Keyword(s):  
Single Crystals ◽  
Current Data ◽  
Polarization Reversal ◽  
Switching Current

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.

Switching Current in Pb(Zn1/3Nb2/3)O3-PbTiO3 Single Crystals

1999 ◽  
Vol 604 ◽  
Author(s):  
Uma Belegundu ◽  
Xiaohong Du ◽  
Kenji Uchino
Keyword(s):  
Solid Solution ◽  
Barium Titanate ◽  
Single Crystal ◽  
Single Crystals ◽  
Applied Field ◽  
Exponential Dependence ◽  
Polarization Reversal ◽  
Switching Current ◽  
Linear Fit ◽  
Two Phases

AbstractSwitching current measurements have been carried out on relaxorferroelectric single crystal-pure PZN, and the solid solution (1-x) Pb(Zni1/3 Nb2/3)O3 - x PbTiO3 with x= 0.04, 0.09, 0.10. Measurements have been done for crystallographic directions [001] and [111] for all these compositions. Switching times versus the applied field showed the following results. Pure PZN along [111] and 0.90PZN—O. 10PT along [001], and [111] showed an exponential dependence. Along [001] the PZN showed a linear fit. For solid solution single crystals-0.96PZN -0.04PT and 0.91PZN £ 0.09PT, a linear fit was obtained for the reciprocal switch times versus applied field for both the directions. If we draw a parallel picture with the reported barium titanate data, it appears that the polarization reversal is controlled by nucleation along [111]- spontaneous direction for PZN and [001], [111]for 0.90PZN - O.10PT. The mobility of the reversed domains controls the reversal along [001] for PZN and the solid solution single crystals with rhombohedral composition along [001] and [111]. The transient current curves showed two maximum points for crystals with x = 0.04 and 0.09. This is attributed to the co-existence of the two phases in 0.96PZN -0.04PT and 0. 91PZN - 0.09PT crystals.

scholarly journals In situ visualization of domain structure evolution during field cooling in 0.67PMN-0.33PT single crystal

2017 ◽  
Vol 256 ◽  
pp. 012025 ◽  
Author(s):  
A D Ushakov ◽  
A A Esin ◽  
D S Chezganov ◽  
A P Turygin ◽  
A R Akhmatkhanov ◽  
...  
Keyword(s):  
Single Crystal ◽  
Domain Structure ◽  
Structure Evolution ◽  
In Situ Visualization ◽  
Field Cooling

Local Polarization Reversal by Ion Beam Irradiation in SBN Single Crystals Covered by Dielectric Layer

2021 ◽  
pp. 1-1
Author(s):  
Vera A. Shikhova ◽  
Dmitry S. Chezganov ◽  
Alla S. Nuraeva ◽  
Maxim S. Nebogatikov ◽  
Evgeny D. Greshnyakov ◽  
...  
Keyword(s):  
Single Crystals ◽  
Dielectric Layer ◽  
Ion Beam ◽  
Polarization Reversal ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Local Polarization

In-Situ Observation of Deformation Processes by OIM

1997 ◽  
Vol 3 (S2) ◽  
pp. 567-568
Author(s):  
Hasso Weiland
Keyword(s):  
Single Crystals ◽  
Mechanical Response ◽  
Thermal Exposure ◽  
Structure Evolution ◽  
In Situ Observation ◽  
Recrystallization Behavior ◽  
X Ray ◽  
Structure Changes ◽  
Deformation Processes

The thermo-mechanical response of single crystals has been studied in detail since the discovery of X-ray and electron diffraction. While an extensive knowledge exists on the effect of crystallographic orientation on deformation and recrystallization behavior of single crystals, the thermo-mechanical response of grains of different orientations embedded in a polycrystalline matrix are not well understood. With the emergence of microstructure based models predicting the structure evolution during deformation or recrystallization, data validating the predicted structure changes are essential. This requires to study the evolution of microstructural attributes such as morphology or orientation of an individual grain within a specific grain neighborhood during mechanical or thermal exposure. Interrupted coupon scale testing, with a separation of testing and microstructural observation is not sufficient due to the small size of the objects to be observed. Thus, the structure evolution of selected grains has to be followed in-situ.

Analysis of switching current data in KTA single crystals

2020 ◽  
Vol 559 (1) ◽  
pp. 1-7
Author(s):  
A. R. Akhmatkhanov ◽  
M. A. Chuvakova ◽  
N. A. Dolgushin ◽  
D. B. Kolker ◽  
V. N. Vedenyapin ◽  
...  
Keyword(s):  
Single Crystals ◽  
Current Data ◽  
Switching Current

scholarly journals Эволюция доменной структуры и формирование заряженных доменных стенок при переключении поляризации в монокристаллах ниобата лития, модифицированных отжигом в вакууме

2018 ◽  
Vol 60 (1) ◽  
pp. 102
Author(s):  
В.И. Пряхина ◽  
Д.О. Аликин ◽  
С.А. Негашев ◽  
В.Я. Шур
Keyword(s):  
Electrical Conductivity ◽  
Spatial Distribution ◽  
Lithium Niobate ◽  
Electric Field ◽  
Domain Walls ◽  
Vacuum Annealing ◽  
Domain Growth ◽  
Polarization Reversal ◽  
Spatially Inhomogeneous ◽  
Crystal Bulk

AbstractThe evolution of the domain structure during polarization reversal has been investigated in plates of lithium niobate with spatially inhomogeneous electrical conductivity produced by vacuum annealing. The formation of charged domain walls in the crystal bulk has been studied. Revealed features of the domain growth in the bulk have been attributed to the formation of nanodomains under the pyroelectric field and inhomogeneous spatial distribution of the electric field. Creation of the charged domain walls with controlled parameters is of great interest for domain walls engineering.

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