Uniaxial stress dependence of electromechanical and dielectric properties of 0.9PMN-O.1PT electroceramics

2002 ◽  
Author(s):  
J. Zhao ◽  
Q.M. Zhang ◽  
V. Mueller
Keyword(s):  
Dielectric Properties ◽  
Uniaxial Stress ◽  
Stress Dependence

Uniaxial stress dependence of the dielectric properties in the Na0.5Bi0.5TiO3–NaTaO3 system

2010 ◽  
Vol 25 (9) ◽  
pp. 1784-1792 ◽  
Author(s):  
Jakob König ◽  
Matjaž Spreitzer ◽  
Boštjan Jančar ◽  
Julian Tolchard ◽  
Mari-Ann Einarsrud ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Time Dependence ◽  
Dielectric Response ◽  
Uniaxial Stress ◽  
Stress Sensitivity ◽  
Time Dependent ◽  
Stress Dependence ◽  
Time Component ◽  
Domain State ◽  
Uniaxial Compressive Stress

The dependence of the dielectric properties on the uniaxial compressive stress and the stress-strain properties was investigated for the case of (1-x)Na0.5Bi0.5TiO3–xNaTaO3 ceramics. Special attention was focused on the time component and the reversibility of the permittivity–stress dependence. The results were interpreted according to the samples' polar and symmetry states and the ferroelasticity. The time dependence and irreversible changes of the dielectric properties were connected with the domain structure of the materials, which is modified under the applied stress. The irreversible changes observed in the macroscopically nonferroelectric compositions were related to the ferroelastic properties. The stress sensitivity increased with the addition of NaTaO3 from 3% in pure Na0.5Bi0.5TiO3 to 14% in the sample with 15 mol% of NaTaO3 (at 200 MPa and 1 MHz). The reversibility was improved by mechanical modification of the samples' domain state, while the dielectric response remained time dependent.

Stress Dependence of Dielectric Properties in Relaxor Ferroelectrics: Monte Carlo Investigation

2009 ◽  
Vol 421-422 ◽  
pp. 227-230 ◽  
Author(s):  
Yongyut Laosiritaworn ◽  
Rattikorn Yimnirun ◽  
Ruyan Guo ◽  
A.S. Bhalla
Keyword(s):  
Monte Carlo ◽  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Spin Glass ◽  
Frequency Dispersion ◽  
Uniaxial Stress ◽  
Relaxor Ferroelectrics ◽  
Stress Dependence ◽  
Monte Carlo Investigation ◽  
Stress Dependent

In this work, we used Monte Carlo simulation to investigate the uniaxial stress dependence of the relaxor dielectric properties. The Metropolis algorithm and the spin glass type interaction were used in updating the local polarizations (representing the polar nano-regions). The exchange interaction in the spin glass Hamiltonian was assumed to be stress dependent via the strain. From the results, the frequency dependence of the dielectric permittivity were found, where, at high enough stress, the dielectric permittivity decreases with increasing stresses in qualitatively good agreement with experiments. In addition, from the modified Curie-Weiss law, all ’s stay close to 2. Therefore, this implies the frequency dispersion universality of the relaxor system under loading conditions.

Uniaxial stress dependence of the Fermi surface of Ru

1984 ◽  
Vol 14 (1) ◽  
pp. 93-96 ◽  
Author(s):  
V E Startsev ◽  
E Fawcett ◽  
M Maszkiewicz ◽  
J M Perz
Keyword(s):  
Fermi Surface ◽  
Uniaxial Stress ◽  
Stress Dependence

Effect of Uniaxial Stress on Dielectric Properties of 0–3 PZT-Portland Cement Composite

2009 ◽  
Vol 384 (1) ◽  
pp. 174-181 ◽  
Author(s):  
N. Jaitanong ◽  
R. Yimnirun ◽  
A. Chaipanich
Keyword(s):  
Dielectric Properties ◽  
Portland Cement ◽  
Cement Composite ◽  
Uniaxial Stress
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