Electric Field Dependence of Curie Temperature in Ferroelectric Crystals

1973 ◽  
Vol 51 (17) ◽  
pp. 1874-1881 ◽  
Author(s):  
B. S. Semwal ◽  
P. K. Sharma
Keyword(s):  
Curie Temperature ◽  
Electric Field ◽  
Field Dependence ◽  
Paraelectric Phase ◽  
Scattering Data ◽  
Function Technique ◽  
Temperature Dependent ◽  
Ferroelectric Crystal ◽  
Electric Field Dependence ◽  
Double Time

The electric field dependence of the Curie temperature of a ferroelectric crystal in its paraelectric phase is investigated from the Silverman–Joseph Hamiltonian augmented with fourth-order phonon coordinates using the temperature dependent double-time Green's function technique. It is shown that the Curie temperature shifts to a lower value by the application of an electric field. This result agrees with the recent Raman scattering data of Worlock and Fleury for SrTiO3.

scholarly journals Theoretical Study of Ferroelectric Triglycine Sulphate (TGS) Crystal in External Electric Fields

2013 ◽  
Vol 11 ◽  
pp. 54-65 ◽  
Author(s):  
Trilok Chandra Upadhyay ◽  
Ashish Nautiyal
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Temperature Dependent ◽  
Triglycine Sulphate ◽  
Acoustical Properties ◽  
Coupled Mode ◽  
Electric Field Dependence ◽  
Crystal Electric Field ◽  
Double Time ◽  
Good Agreement

A modified two sub-lattice pseudospin-lattice coupled mode model of Mitsui et al [Phys. Rev., 111 (1958) 1259] by adding third, fourth order phonon anharmonic interaction and external electric field terms has been applied to ferroelectric triglycine sulphate crystal. Electric field dependence of ferroelectric, dielectric and acoustical properties has been studied. With the help of double time temperature dependent Green’s function method, expressions for shift, width, soft mode frequency, dielectric constant, loss tangent and acoustic attenuation have been derived. Numerically calculations have been made and results have been compared with experimental data reported by Bye et al [Ferroelectrics 4 (1974) 243] and Shreekumar et al [Ferroelectrics 160 (1994) 23] for TGS crystal and a good agreement has been observed.

On the Interaction of Positrons with Argon

1972 ◽  
Vol 50 (8) ◽  
pp. 821-825 ◽  
Author(s):  
Peter W. Hewson ◽  
Garth Jones ◽  
Erich W. Vogt
Keyword(s):  
Electric Field ◽  
Positron Annihilation ◽  
Field Dependence ◽  
Local Density ◽  
Polarization Potential ◽  
Annihilation Rate ◽  
Temperature Dependent ◽  
Electric Field Dependence ◽  
Enhancement Factors ◽  
Good Agreement

A semi-phenomenological model of the interaction of positrons with atoms is outlined, and some model properties—enhancement factors, effective mass, and effective charge—are calculated using a local density approximation. These properties are used with a one parameter polarization potential to predict the electric field dependence and the temperature dependence of the positron annihilation rate in argon gas. Comparison of these predictions with experimental data shows good agreement for the electric field dependence, but the predicted temperature dependent effect is less than published experimental results. The model is also applied to helium, with unsatisfactory results, and a prediction of the electric field dependence of the positron annihilation rate in krypton is made.

Transient Electric Field Analysis in Consideration of the Electric Field Dependence of Resistivity in the Converter Transformer

2015 ◽  
Vol 135 (12) ◽  
pp. 731-736
Author(s):  
Takuma Terakura ◽  
Kei Takano ◽  
Takanori Yasuoka ◽  
Shigekazu Mori ◽  
Osamu Hosokawa ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Dependence ◽  
Field Analysis ◽  
Electric Field Dependence ◽  
Electric Field Analysis ◽  
Transient Electric Field

scholarly journals Electric Field Dependence of the Fluorescence Intensity of Solute Molecules and Fourth Order Effects

1985 ◽  
Vol 40 (9) ◽  
pp. 874-876
Author(s):  
Hilmar Bischof ◽  
Wolfram Baumann
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Field Dependence ◽  
Fourth Order ◽  
Fluorescence Intensity ◽  
Room Temperature ◽  
Order Effects ◽  
Electric Field Dependence ◽  
Total Fluorescence

Abstract The effect of an external electric field on the total fluorescence of solute molecules is studied up to fourth order theoretically, and is checked experimentally with 4´-N,N-dimethylamino- 4-nitrostilbene in dioxane at room temperature.

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