Piezoelectric properties of rhombohedral ferroelectric materials with phase transition

2015 ◽  
Vol 08 (03) ◽  
pp. 1540008 ◽  
Author(s):  
Xiaofang Zhao ◽  
A. K. Soh
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Piezoelectric Coefficient ◽  
Intermediate Phase ◽  
Transition Process ◽  
Field Method ◽  
Ferroelectric Material ◽  
Transformation Process ◽  
Ferroelectric Materials ◽  
Phase Field Method

The temporal evolution of domain structure and its piezoelectric behavior of ferroelectric material BaTiO 3 during the transition process from rhombohedral to tetragonal phase under an applied electric field have been studied by employing Landau–Ginzburg theory and the phase-field method. The results obtained show that, during the transformation process, the intermediate phase was monoclinic MA phase, and several peak values of piezoelectric coefficient appeared at the stage where obvious change of domain pattern occurred. In addition, by comparing the cases of applied electric field with different frequencies, it was found that the maximum piezoelectric coefficient obtained decreased with increasing frequency value. These results are of great significance in tuning the properties of engineering domains in ferroelectrics, and could provide more fundamentals to the design of ferroelectric devices.

Shape of piezoelectric hysteresis loop for non-ferroelastic switching

2003 ◽  
Vol 784 ◽  
Author(s):  
A. K. Tagantsev ◽  
P. Muralt ◽  
J. Fousek
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Hysteresis Loop ◽  
Single Crystals ◽  
Applied Electric Field ◽  
Piezoelectric Coefficient ◽  
Hysteresis Loops ◽  
Simple Theory ◽  
The Difference

ABSTRACTA simple theory for the shape of the piezoelectric hysteresis loops (piezoelectric coefficient d vs. applied electric field E) is developed for the case of non-ferroelelastic 180° switching in ferroelectrics. The theory provides explanations for specific features of piezoelectric hysteresis loops, which have been observed in single crystals, thin films and in ceramics in particular. The piezoelectric coefficient may show a “hump”, i.e. when E decreases from the tip of the loop down to zero, d passes through a maximum, and a “nose”, i.e. a self-crossing of the loop close to its tips. The theory also explains the difference in the coercive fields seen in the polarization and piezoelectric loops.

Comparison between Ferromagnetic and Ferroelectric Optical Switch Devices in Terms of the Response to the Electric Field

2018 ◽  
Vol 23 ◽  
pp. 1-7
Author(s):  
Rabi Noori Hammudi ◽  
Sudad Salman Al-Bassam ◽  
Rawa Khalil Ibrahim ◽  
Aseel Ibrahim Mahmood ◽  
Peter Kopčanský ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Electric Field ◽  
Response Time ◽  
Applied Electric Field ◽  
Optical Switch ◽  
Ferroelectric Material ◽  
Optical Effect ◽  
Constituent Material ◽  
Electro Optic ◽  
The Difference

In this work we have studied the electro-optical effect of two types of ferronematic nanoparticles. The first sample doped with magnetic material Fe3O4 and the second sample doped with a ferroelectric material SbSI. The difference in the two types of material that has been vaccinated led to different values of electro-optic properties because of the different susceptibility of materials. We have noticed that the material SbSI was more responsive to the applied electric field due to the nature of the constituent material (electric material) than the Fe3O4 ferromagnetic. The response time for the material SbSI is less than the response time of the ferromagnetic Fe3O4, that led to make the material SbSI best in the optical switch applications.

scholarly journals Electrocaloric Response of Ferroelectric Material Applicable as Electrothermal Transducer

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Saber Mohammadi ◽  
Akram Khodayari ◽  
Arash Ahmadi
Keyword(s):  
Heat Flux ◽  
Electric Field ◽  
Boundary Conditions ◽  
Ferroelectric Material ◽  
Ferroelectric Materials ◽  
Numerical Results ◽  
Temperature Range ◽  
Periodic Electric Field ◽  
Ferroelectric Capacitors

Electrocaloric response of the PMN-10PT is measured experimentally and compared with the numerical results. Based on the compatibility of the experimental and numerical results, feasibility of using ferroelectric materials as an electrothermal transducer has been investigated. In this study, electrocaloric response of three different ferroelectric capacitors (PMN-10PT, PMN-25PT, and PZN-4.5PT) under an applied periodic electric field have been investigated. Alternative switching of the electrocaloric elements with specific boundary conditions generates a directed heat flux. It can be concluded that each ferroelectric material can be used as a transducer in a special temperature range that in which it has good electrocaloric response.

Development of improved bubble disruption and dispersion technique by an applied electric field method

AIChE Journal ◽  
1985 ◽  
Vol 31 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Sumitoshi Ogata ◽  
Kazushi Tan ◽  
Kiyoto Nishijima ◽  
Jen-Shih Chang
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Field Method ◽  
Dispersion Technique ◽  
Electric Field Method

Characterizing Ice Crystal Growth Behavior Under Electric Field Using Phase Field Method

2009 ◽  
Vol 131 (7) ◽  
Author(s):  
Zhi Zhu He ◽  
Jing Liu
Keyword(s):  
Crystal Growth ◽  
Electric Field ◽  
Phase Field ◽  
Field Method ◽  
Growth Behavior ◽  
Phase Field Method ◽  
Competitive Growth ◽  
Ice Crystal ◽  
Injury Mechanisms ◽  
Crystal Growth Behavior

In this article, the microscale ice crystal growth behavior under electrostatic field is investigated via a phase field method, which also incorporates the effects of anisotropy and thermal noise. The multiple ice nuclei’s competitive growth as disclosed in existing experiments is thus successfully predicted. The present approach suggests a highly efficient theoretical tool for probing into the freeze injury mechanisms of biological material due to ice formation during cryosurgery or cryopreservation process when external electric field was involved.

Numerical simulation of electrohydrodynamics of a compound drop based on the ternary phase field method

2019 ◽  
Vol 103 (1) ◽  
pp. 003685041988647
Author(s):  
Yu Su ◽  
Tong Yu ◽  
Guicheng Wang ◽  
Chunyan Zhang ◽  
Zhiqiang Liu
Keyword(s):  
Finite Element ◽  
Numerical Methods ◽  
Electric Field ◽  
Large Deformation ◽  
Phase Field ◽  
Ternary Phase ◽  
Field Method ◽  
Phase Field Method ◽  
Weak Electric Field ◽  
Multiphase Fluid

Analytical and numerical methods are often used to study the behavior of multiphase fluid under electric field. Compared with analytical methods, numerical methods can simulate the real physical phenomenon of multiphase fluid dynamics in a large deformation range. The finite element method is mainly applied in two-phase fluid currently, although it can be used to analyze the small and large deformation of multiphase fluid under electric field. This article attempts to develop a finite element model of a concentric compound drop immersed in continuous medium under electric field based on the ternary phase field method and simulate the electrohydrodynamics of the compound drop whose core phase, shell phase, and continuous phase are different. The small deformation simulation results of the compound drop under weak electric field are compared with the analytical results of previous researchers from the three aspects, namely, deformation, free charge distribution, and flow pattern. This model is proved to be effective under certain conditions. Based on this premise, the large deformation and breakup of the compound drop under high electric field are further simulated to investigate the mechanism of compound drop breakup preliminarily.

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