Temperature-dependence of electromechanical coupling and strain in barium titanate hafnate transducer

1987 ◽  
Vol 32 (3) ◽  
pp. 729-735 ◽  
Author(s):  
A. Tawfik ◽  
M. I. Abd El Ati
Keyword(s):  
Barium Titanate ◽  
Temperature Dependence ◽  
Electromechanical Coupling

scholarly journals Combined piezoelectric and flexoelectric effects in resonant dynamics of nanocantilevers

2018 ◽  
Vol 29 (20) ◽  
pp. 3949-3959 ◽  
Author(s):  
Adriane G Moura ◽  
Alper Erturk
Keyword(s):  
Barium Titanate ◽  
Frequency Response ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Analytical Framework ◽  
Electromechanical Coupling Coefficient ◽  
Sensors And Actuators ◽  
Energy Harvesters ◽  
Size Dependent ◽  
Resonant Dynamics

We establish and analyze an analytical framework by accounting for both the piezoelectric and flexoelectric effects in bimorph cantilevers. The focus is placed on the development of governing electroelastodynamic piezoelectric–flexoelectric equations for the problems of resonant energy harvesting, sensing, and actuation. The coupled governing equations are analyzed to obtain closed-form frequency response expressions via modal analysis. The combined piezoelectric–flexoelectric coupling coefficient expression is identified and its size dependence is explored. Specifically, a typical atomistic value of the flexoelectric constant for barium titanate is employed in the model simulations along with its piezoelectric constant from the existing literature. It is shown that the effective electromechanical coupling of a piezoelectric material, such as barium titanate, is significantly enhanced for thickness levels below 100 nm. The electromechanical coupling coefficient of a barium titanate bimorph cantilever increases from the bulk piezoelectric value of 0.065 to the combined piezoelectric–flexoelectric value exceeding 0.3 toward nanometer thickness level. Electromechanical frequency response functions for resonant power generation and dynamic actuation also capture the size-dependent enhancement of the electromechanical coupling. The analytical framework given here can be used for parameter identification and design of nanoscale cantilevers that can be used as energy harvesters, sensors, and actuators.

The temperature dependence of the debye-waller-factor in barium titanate

1981 ◽  
Vol 37 (1) ◽  
pp. 507-510 ◽  
Author(s):  
K. H. Ehses ◽  
H. Bock ◽  
K. Fischer
Keyword(s):  
Barium Titanate ◽  
Temperature Dependence ◽  
Waller Factor ◽  
Debye Waller Factor

Temperature Dependence of the Breakdown Field of Barium Titanate

1959 ◽  
Vol 113 (2) ◽  
pp. 456-458 ◽  
Author(s):  
P. H. Fang ◽  
W. S. Brower
Keyword(s):  
Barium Titanate ◽  
Temperature Dependence ◽  
Breakdown Field

Temperature dependence dielectric properties of modified barium titanate-PVB composites

2013 ◽  
Author(s):  
N. J. Joshi ◽  
P. B. Rakshit ◽  
G. S. Grewal ◽  
V. Shrinet ◽  
A. Pratap
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Temperature Dependence

Temperature Dependence of the Coarsening Behavior of Barium Titanate Grains

2000 ◽  
Vol 83 (12) ◽  
pp. 3202-3204 ◽  
Author(s):  
Myung-Goo Kang ◽  
Doh-Yeon Kim ◽  
Ho-Yong Lee ◽  
Nong M. Hwang
Keyword(s):  
Barium Titanate ◽  
Temperature Dependence ◽  
Coarsening Behavior
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