scholarly journals Influence of Longitudinal Electric Field on Thermodynamic Properties of NH3CH2COOH·H2PO3 Ferroelectric

2018 ◽  
Vol 63 (4) ◽  
pp. 350
Author(s):  
A. S. Vdovych ◽  
I. R. Zachek ◽  
R. R. Levitskii
Keyword(s):  
Electric Field ◽  
Dipole Moments ◽  
Quantitative Description ◽  
Thermodynamic Characteristics ◽  
Polarization Vector ◽  
Longitudinal Electric Field ◽  
Model Parameters ◽  
Cluster Approximation ◽  
Static Dielectric Permittivity ◽  
Piezoelectric Coupling

Using a modified model of ferroelectric glycine phosphite by considering the piezoelectric coupling with strains e1 within the two-particle cluster approximation, the expressions for the polarization vector, static dielectric permittivity tensor, piezoelectric coefficients, and elastic constants of the crystal in the presence of a longitudinal electric field E2 are calculated. An analysis of the influence of this field on thermodynamic characteristics of the crystal is carried out. The dependence of effective dipole moments on order parameters is taken into account. This allowed us to agree the effective dipole moments in the ferro- and paraelectricphases and to describe the smearing of phase transition under the influence of an electric field. The satisfactory quantitative description of the available experimental data for these characteristics has been obtained at the proper choice of the model parameters.

Influence of the uniaxial stress $p_2$ and transverse fields $E_1$ and $E_3$ on the phase transitions and thermodynamic characteristics of GPI ferroelectric materials

2021 ◽  
Vol 8 (3) ◽  
pp. 454-464
Author(s):  
R. R. Levitskii ◽  
◽  
I. R. Zachek ◽  
A. S. Vdovych ◽  
O. B. Bilenka ◽  
...  
Keyword(s):  
Electric Fields ◽  
Thermodynamic Characteristics ◽  
Uniaxial Stress ◽  
Ferroelectric Materials ◽  
Simultaneous Action ◽  
Structural Elements ◽  
Cluster Approximation ◽  
Static Dielectric Permittivity ◽  
Piezoelectric Coupling ◽  
Transverse Fields

A modified GPI model that accounts for the piezoelectric coupling between the ordered structural elements and the strains $\varepsilon_j$ has been used for studing of effects arising in GPI ferroelectrics under the action of the uniaxial stress $p_{2}$ and electric fields $E_1$ and $E_3$. The polarization vectors and components of static dielectric permittivity are calcucated in the two-particle cluster approximation for mechanically clamped crystal, and piezoelectric and thermal parameters are also determined. The influence of the simultaneous action of the stress $p_{2}$ and fields $E_1$ and $E_3$ on the phase transition and physical characteristics of GPI crystal has been studied.

scholarly journals Influence of External Pressures of Different Symmetry on the Phase Transitions and Thermodynamic of the RbHSO4 Ferroelectrics

2015 ◽  
Vol 16 (2) ◽  
pp. 276-283
Author(s):  
I.R. Zachek ◽  
M.C. Karkuljevska ◽  
A.S. Vdovych ◽  
R.R. Levitsky
Keyword(s):  
Quantitative Description ◽  
Mean Field ◽  
Polarization Vector ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Static Dielectric Permittivity ◽  
External Pressures ◽  
Piezoelectric Coupling ◽  
The Mean ◽  
Piezoelectric Characteristics

We use the four-sublattice model of the RbHSO4 crystal modified by taking  into account the piezoelectric coupling to the strains ,  . Within the mean  field approximation we calculate the components of the polarization vector  and static dielectric permittivity tensor of mechanically clamped and free  crystals, as well as their piezoelectric characteristics. We study the  influence of hydrostatic pressure  and uniaxial stresses  on the phase  transition and physical characteristics of the crystal. A good  quantitative description of the experimental data is obtained.

scholarly journals Longitudinal and Transverse Electrocaloric Effects in Glycinium Phosphite Ferroelectric

2021 ◽  
Vol 66 (5) ◽  
pp. 412
Author(s):  
A.S. Vdovych
Keyword(s):  
Electric Fields ◽  
Thermal Characteristics ◽  
Polarization Vector ◽  
Transverse Field ◽  
Shear Stresses ◽  
Cluster Approximation ◽  
Effective Dipole Moment ◽  
Transverse Electric Fields ◽  
Piezoelectric Coupling ◽  
Proton Ordering

A modified proton ordering model of glycinium phosphite ferroelectric, which involves the piezoelectric coupling of the proton and lattice subsystems, is used for the investigation of the electrocaloric effect. The model also accounts for the dependence of the effective dipole moment on a hydrogen bond on an order parameter, as well as a splitting of parameters of the interaction between pseudospins in the presence of shear stresses. In the two-particle cluster approximation, the influence of longitudinal and transverse electric fields on components of the polarization vector and the dielectric permittivity tensor, as well as on thermal characteristics of the crystal, is calculated. Longitudinal and transverse electrocaloric effects are studied. The calculated electrocaloric temperature change is quite small, about 1K; however, it can change its sign under the influence of a transverse field.

scholarly journals Frequency-Dependent FDTD Algorithm Using Newmark’s Method

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Bing Wei ◽  
Le Cao ◽  
Fei Wang ◽  
Qian Yang
Keyword(s):  
Differential Equation ◽  
Electric Field ◽  
Field Intensity ◽  
Time Domain ◽  
Difference Method ◽  
Electric Field Intensity ◽  
Polarization Vector ◽  
Solution Stability ◽  
Central Difference ◽  
Central Difference Method

According to the characteristics of the polarizability in frequency domain of three common models of dispersive media, the relation between the polarization vector and electric field intensity is converted into a time domain differential equation of second order with the polarization vector by using the conversion from frequency to time domain. Newmarkβγdifference method is employed to solve this equation. The electric field intensity to polarizability recursion is derived, and the electric flux to electric field intensity recursion is obtained by constitutive relation. Then FDTD iterative computation in time domain of electric and magnetic field components in dispersive medium is completed. By analyzing the solution stability of the above differential equation using central difference method, it is proved that this method has more advantages in the selection of time step. Theoretical analyses and numerical results demonstrate that this method is a general algorithm and it has advantages of higher accuracy and stability over the algorithms based on central difference method.

HQC with the AC setup associated with topological defects

2011 ◽  
Vol 11 (5&6) ◽  
pp. 444-455
Author(s):  
Knut Bakke ◽  
Cláudio Furtado
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Topological Defect ◽  
Dipole Moments ◽  
Topological Defects ◽  
Quantum Phases ◽  
Neutral Particles ◽  
New Formulation

In this work, we propose a new formulation allowing to realize the holonomic quantum computation with neutral particles with a permanent magnetic dipole moments interacting with an external electric field in the presence of a topological defect. We show that both the interaction of the electric field with the magnetic dipole moment and the presence of topological defect generate independent contributions to the geometric quantum phases which can be used to describe any arbitrary rotation on the magnetic dipole moment without using the adiabatic approximation.

scholarly journals Динамика фотоиндуцированного вращения сферической частицы в постоянном электрическом поле

2019 ◽  
Vol 89 (1) ◽  
pp. 5
Author(s):  
А.И. Грачев
Keyword(s):  
Dipole Moment ◽  
Electric Field ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Constant Electric Field ◽  
Rotation Effect ◽  
General Terms ◽  
Nonspherical Shape ◽  
Rotation Dynamics

AbstractThe rotation of a spherical particle in a constant electric field (an effect found earlier) has been analyzed. The particle is illuminated to induce the electric dipole moment of the sphere. The dynamics of the rotation effect has been considered in general terms to refine conditions for adiabatic rotation. The features of the particle’s nonadiabatic rotation have been demonstrated with a sphere placed in a medium with an infinitesimal viscosity. It has been shown that the nonadiabatic rotation dynamics to a great extent depends on a relationship between the electrical and photoinduced dipole moments of the sphere. The rotation dynamics of a particle with a slightly nonspherical shape has been briefly analyzed.

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