Enhancement of piezoelectric properties in perovskite crystals by thermally, compositionally, electric field and stress-induced instabilities

2008 ◽  
Keyword(s):  
Electric Field ◽  
Piezoelectric Properties

scholarly journals Influence of Piezoelectric Performance on Nonlinear Dynamic Characteristics of MFC Shells

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Xiangying Guo ◽  
Pan Jiang ◽  
Dongxing Cao
Keyword(s):  
Electric Field ◽  
Nonlinear Dynamic ◽  
Piezoelectric Properties ◽  
Great Influence ◽  
Dynamic Responses ◽  
Aerodynamic Forces ◽  
External Excitation ◽  
Structural Dynamic ◽  
Laminated Shells ◽  
Laminated Shell

Based on the structures of unmanned aerial vehicle (UAV) wings, nonlinear dynamic analysis of macrofiber composite (MFC) laminated shells is presented in this paper. The effects of piezoelectric properties and aerodynamic forces on the dynamic stability of the MFC laminated shell are studied. Firstly, under the flow condition of ideal incompressible fluid, the thin airfoil theory is employed to calculate the effects of the mean camber line to obtain the circulation distribution of the wings in subsonic air flow. The steady aerodynamic lift on UAV wings is derived by using the Kutta–Joukowski lift theory. Then, considering the geometric nonlinearity and piezoelectric properties of the MFC material, the nonlinear dynamic model of the MFC laminated shell is established with Hamilton’s principles and the Galerkin method. Next, the effects of electric field, external excitation force, and nonlinear parameters on the stability of the system are studied under 1 : 1 internal resonance and the effects of material parameters on the natural frequency of the structure are also analyzed. Furthermore, the influence of the aerodynamic forces and electric field on the nonlinear dynamic responses of MFC laminated shells is discussed by numerical simulation. The results indicate that the electric field and external excitation have great influence on the structural dynamic responses.

Piezoelectric Properties and Electric Field-Induced-Strains of Textured (Bi1/2K1/2)TiO3- BaTiO3 Ceramics

2013 ◽  
Vol 566 ◽  
pp. 50-53
Author(s):  
Fumiaki Kawada ◽  
Yuji Hiruma ◽  
Hajime Nagata ◽  
Tadashi Takenaka
Keyword(s):  
Electric Field ◽  
Grain Growth ◽  
Piezoelectric Properties ◽  
Density Ratio ◽  
Orientation Factor ◽  
Templated Grain Growth ◽  
Direction Parallel ◽  
Piezoelectric Strain ◽  
High Orientation ◽  
Piezoelectric Strain Constant

Grain-oriented 0.8(Bi1/2K1/2)TiO3-0.2BaTiO3 (BKT-BT20) ceramics were prepared by the Reactive Templated Grain Growth (RTGG) method. The BKT-BT20 ceramics sintered at 1070°C for 100 h. The grain-oriented BKT-BT20 exhibited relatively high orientation factor, F, of 0.87 and density ratio of 92%. A resistivity of textured BKT-BT20 was 1.29×1013 Ωcm. Piezoelectric strain constant, d33, and the normalized strain, d33*, of the textured BKTBT20 ceramic in the direction parallel (//) to the tape stacking direction were 117 pC/N and 243 pm/V (at 80 kV/cm), respectively.

scholarly journals Localized nonlinear waves in a semiconductor with charged dislocations

2021 ◽  
Vol 250 ◽  
pp. 03012
Author(s):  
Vladimir I. Erofeev ◽  
Anna V. Leonteva ◽  
Alexey O. Malkhanov ◽  
Ashot V. Shekoyan
Keyword(s):  
Electric Field ◽  
Evolution Equation ◽  
Ultrasonic Wave ◽  
Nonlinear Waves ◽  
Piezoelectric Properties ◽  
Exact Analytical Solution ◽  
Constant Electric Field ◽  
Ultrasonic Waves ◽  
Wave Dynamics ◽  
Piezoelectric Semiconductors

To describe a nonlinear ultrasonic wave in a semiconductor with charged dislocations, an evolution equation is obtained that generalizes the well-known equations of wave dynamics: Burgers and Korteweg de Vries. By the method of truncated decompositions, an exact analytical solution of the evolution equation with a kink profile has been found. The kind of kink (increasing, decreasing) and its polarity depend on the values of the parameters and their signs. An ultrasonic wave in a semiconductor containing numerous charged dislocations is considered. It is assumed that there is a constant electric field that creates an electric current. The situation is similar to the case of the propagation of ultrasonic waves in piezoelectric semiconductors, but in the problem under consideration, instead of the electric field due to the piezoelectric properties of the medium, the electric field of dislocations appears.

On the Dislocation Contribution to the Dielectric Loss in the Materials with Piezoelectric Properties

2019 ◽  
Vol 945 ◽  
pp. 796-800
Author(s):  
V.N. Nechaev ◽  
V.V. Dezhin
Keyword(s):  
Dielectric Loss ◽  
Electric Field ◽  
Piezoelectric Properties ◽  
Dielectric Dispersion ◽  
Field Energy ◽  
Relaxation Processes ◽  
Variable Electric Field ◽  
Additional Information ◽  
Piezoelectric Coupling ◽  
Energy Dissipated

A variable electric field is applied to a crystal. This field gives rise – through the piezoelectric coupling – to the variable mechanical stresses. Then the dislocations in the crystal will be driven by Peach-Koehler force and will start moving, dissipating the external field energy. Connection of the electric field energy dissipated per unit time with the internal friction is found. The case of resonant loss (Granato-Lucke model) is considered. The loss related to this mechanism to be at frequencies of megahertz range. The relaxation processes being responsible for the Bordoni and Hasiguti peaks also are considered. The use of obtained equations makes it possible to distinguish the dislocation contribution to both dielectric loss and dielectric dispersion and, therefore, to derive additional information about the crystal structure in a sufficiently simple way in terms of only one method.

Temperature-insensitive electric-field-induced strain and enhanced piezoelectric properties of textured (K,Na)NbO3-based lead-free piezoceramics

2018 ◽  
Vol 156 ◽  
pp. 389-398 ◽  
Author(s):  
Haibo Zhang ◽  
Yiwei Zhu ◽  
Pengyuan Fan ◽  
Mohsin Ali Marwat ◽  
Weigang Ma ◽  
...  
Keyword(s):  
Electric Field ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Electric Field Induced Strain
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