THE EFFECT OF ELECTRIC FIELD ON THE DIELECTRIC PERMITTIVITY OF BST/STO SUPERLATTICE

2013 ◽  
Vol 27 (10) ◽  
pp. 1350066 ◽  
Author(s):  
ZHI-GAO ZUO ◽  
FU-RI LING ◽  
DAN LI ◽  
JIN-SONG LIU ◽  
JIAN-QUAN YAO
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
External Electric Field ◽  
Ferroelectric Properties ◽  
Transformation Strain ◽  
Elastic Interaction ◽  
Dielectric Behavior ◽  
Electrical Field ◽  
External Electrical Field

A nonlinear thermodynamic model is developed for investigating the effect of external electric field on the dielectric properties of Ba 0.6 Sr 0.4 TiO 3/ SrTiO 3( BST / STO ) super-lattice. The transformation strain induced by the external electrical field are analyzed and calculated. It is found that the dielectric and ferroelectric properties of the ( BST / STO ) superlattice vary substantially with the interlayer elastic interaction caused by the external electrical field. The results also provide better understanding of the dielectric behavior of BST / STO superlattice with external electric field and a necessary step in the development of the general nonlinear theory.

Robustness of the electronic structure and charge transfer in topological insulator Bi2Te2Se and Bi2Se2Te thin films under an external electric field

2020 ◽  
Vol 22 (7) ◽  
pp. 3867-3874 ◽  
Author(s):  
Yurong Ruan ◽  
Lu Huang ◽  
Yanmin Yang ◽  
Guigui Xu ◽  
Kehua Zhong ◽  
...  
Keyword(s):  
Thin Films ◽  
Electronic Structure ◽  
Charge Transfer ◽  
Electric Field ◽  
External Electric Field ◽  
Topological Insulator ◽  
Electrical Field ◽  
External Electrical Field

The electronic structure and charge transfer of Bi2Te2Se and Bi2Se2Te thin films are robust to an external electrical field.

scholarly journals The effect of an AC electric field on the dielectric properties of Pb(Mg1/3Nb2/3)O3 ceramic

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
E.C. Lima ◽  
J.D.S. Guerra ◽  
E.B. Araujo
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Statistical Model ◽  
Dielectric Response ◽  
Freezing Temperature ◽  
Dielectric Dispersion ◽  
Electrical Field ◽  
Ac Electric Field ◽  
Applied Electrical Field

The dynamic dielectric response of Pb(Mg1/3Nb2/3 )O3 ceramic was experimentally studied as a function of the EAC amplitude field. An increase in real dielectric permittivity was obtained by increasing the applied electrical field within the investigated temperature range for frequencies below 10 kHz. The temperature of maximum dielectric permittivity and freezing temperature decreased with an increase in E AC. Nonlinear permittivity was studied and found to behave similarly to freezing temperature. A statistical model was used to fit the dielectric dispersion of real dielectric permittivity with temperature and frequency. The results are discussed in terms of different factors’ contributions to dielectric permittivity under different EAC field conditions.

Electrostatic Forces on Particles Floating Within the Interface Between Two Immiscible Fluids

2007 ◽  
Author(s):  
Nadine Aubry ◽  
Pushpendra Singh
Keyword(s):  
Dielectric Properties ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
External Electric Field ◽  
Capillary Force ◽  
Electrostatic Force ◽  
Immiscible Fluids ◽  
Electrostatic Forces ◽  
Dipole Interactions

The objective of this paper is to study the dependence of the electrostatic force that act on a particle within the interface between two immiscible fluids on the parameters such as the dielectric properties of the fluids and particles, the particle’s position within the interface, and the electric field strength. It is shown that the component of electrostatic force normal to the interface varies as a2, where a is the particle radius, and since in equilibrium it is balanced by the vertical capillary force, the interfacial deformation caused by the particle changes when an external electric field is applied. In addition, there are lateral electrostatic forces among the particles due to the dipole-dipole interactions which, when the distance between two particles is O(a), vary as a2, and remain significant for submicron sized particles.

Analysis and Design of Smart Electromagnetic Structures

2008 ◽  
Author(s):  
Prashanth Ramesh ◽  
Gregory Washington
Keyword(s):  
Dielectric Permittivity ◽  
Electric Field ◽  
Ambient Temperature ◽  
Ferroelectric Properties ◽  
Mechanical Strain ◽  
Ferroelectric Materials ◽  
Analysis And Design ◽  
Antenna Performance ◽  
Active Research ◽  
The Relationship

Use of ferroelectric materials to improve antenna performance is an area of active research. Applying an electric field across a ferroelectric used as the dielectric in an antenna enables tuning the antenna performance. Ferroelectrics also have coupled electromechanical behavior due to which it is sensitive to mechanical strains and fluctuations in ambient temperature. Use of ferroelectrics in antenna structures, especially those subject to mechanical and thermal loads, requires knowledge of the phenomenological relationship between the ferroelectric properties of interest (especially dielectric permittivity) and the external physical variables, viz. electric field(s), mechanical strains and temperature. To this end, a phenomenological model of ferroelectric materials based on the Devonshire thermodynamic theory is presented. This model is then used to obtain a relationship expressing the dependence of the dielectric permittivity on the mechanical strain, applied electric field and ambient temperature. The relationship is compared with published experimental data and other models in literature. Subsequently, a relationship expressing the dependence of antenna performance on those physical quantities is described.

Dielectric Properties of Dielectrophoretically Aligned ZnO-PDMS Composites

2016 ◽  
Author(s):  
Md Abdulla Al Masud ◽  
Zoubeida Ounaies
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Electric Field ◽  
Mechanical Analysis ◽  
High Yield ◽  
Chemical Route ◽  
Random Composites ◽  
Pdms Elastomer ◽  
Random Dispersion ◽  
Zno Rods

ZnO based polymer composite materials are of great interest because of their excellent electrical, optical, semiconductor and biocompatible properties. In this study, we synthesize anisotropic composites of aligned ZnO rods in polydimethylsiloxane (PDMS) elastomer and study their dielectric properties as a function of applied electric field and frequency. Submicron ZnO rods are synthesized using an inexpensive, high yield chemical route. Washed and purified ZnO rods are then aligned in uncured PDMS at different electric field and frequency. We find that under electric field, ZnO rotates with their long axis in the direction of the electric field and before coalescing form chains in the silicone elastomer. From the optical microscopy images and in situ dielectric measurements, the best alignment parameters are found at 4 kV/mm and 10 kHz. These conditions are then selected to prepare aligned ZnO-PDMS composites. Complete curing of composites is confirmed using dynamic mechanical analysis (DMA). Our results show that aligned ZnO in uncured PDMS exhibit higher dielectric permittivity compared to random dispersion with the same composition. For the cured ZnO-PDMS composites, dielectric permittivity increases by 80% compared to random composites.

Electric field control of resistive switching and magnetization in epitaxial LaBaCo2O5+δ thin films

2019 ◽  
Vol 21 (17) ◽  
pp. 8843-8848 ◽  
Author(s):  
Jamal Shaibo ◽  
Rui Yang ◽  
Zhe Wang ◽  
He-Ming Huang ◽  
Jue Xiong ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Bond Length ◽  
Resistive Switching ◽  
Oxygen Vacancies ◽  
Electrical Field ◽  
External Electrical Field ◽  
Field Control

Resistive switching and magnetization in epitaxial LaBaCo2O5+δ films can be controlled through an external electrical field, and the switching is related to the tuning of oxygen vacancies and the Co–O–Co bond length.

The `Octopus' plate for protein crystallization under an electric field

2003 ◽  
Vol 36 (6) ◽  
pp. 1482-1483 ◽  
Author(s):  
C. Charron ◽  
C. Didierjean ◽  
J. P. Mangeot ◽  
A. Aubry
Keyword(s):  
Electric Field ◽  
Protein Crystallization ◽  
Electrical Field ◽  
External Electrical Field ◽  
Vapour Diffusion

A piece of equipment, adapted to a vapour-diffusion plate, has been designed to apply an external electrical field during the crystallization of protein samples.

STUDIES OF ER FLUIDS FEATURING RODLIKE PARTICLES

1996 ◽  
Vol 10 (23n24) ◽  
pp. 2925-2932 ◽  
Author(s):  
REX C. KANU ◽  
MONTGOMERY T. SHAW
Keyword(s):  
Dielectric Properties ◽  
Electric Field ◽  
Experimental Evidence ◽  
Rheological Properties ◽  
External Electric Field ◽  
Particle Interactions ◽  
Mechanical Interaction ◽  
Rodlike Particles ◽  
Er Fluids

Chaining of micron-sized polarizable particles in ER fluids is generally accepted to be responsible for the liquid-to-solid transitions on the application of an external electric field. It has been hypothesized that the strength of the particle-particle interactions solely determines the rheological properties of ER fluids. In our work, the particle’s structure has been used to control interactions; for example, we have developed systems featuring rodlike particles. With such particles it should be possible to enhance the dielectric interaction of the particles as well as their mechanical interaction. The main goal of our effort has been to distinguish between these two mechanisms through measurements of the dielectric properties in conjunction with the rheological responses. Based on the experimental evidence thus far gathered, we can state that most, but not all, of the rheological effects are explainable in terms of the dielectric changes in the fluid.

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