POLARIZATION CAPACITANCE OF DOPED POTASSIUM BROMIDE CRYSTALS

1966 ◽  
Vol 44 (5) ◽  
pp. 965-970 ◽  
Author(s):  
H. J. Wintle ◽  
J. Rolfe
Keyword(s):  
Diffusion Coefficient ◽  
Space Charge ◽  
Potassium Bromide ◽  
Space Charge Polarization ◽  
Experimental Results ◽  
Charge Polarization ◽  
Polarization Capacity ◽  
And Diffusion

Measurements have been made of the capacitance and conductance at 200 c.p.s. of a series of potassium bromide crystals doped with divalent anion and cation impurities. The dependence of the space-charge polarization capacity, caused by blocking of current carriers at the electrodes, on the conductivity and diffusion coefficient of carriers has been established. It is concluded that linearized theories of space-charge polarization cannot explain the experimental results.

scholarly journals Effect of Radial Moisture Distribution on Frequency Domain Dielectric Response of Oil-Polymer Insulation Bushing

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1219 ◽  
Author(s):  
Daning Zhang ◽  
Guanwei Long ◽  
Yang Li ◽  
Haibao Mu ◽  
Guanjun Zhang
Keyword(s):  
Moisture Content ◽  
Space Charge ◽  
Frequency Domain ◽  
Water Distribution ◽  
Space Charge Polarization ◽  
Moisture Distribution ◽  
Mechanism Analysis ◽  
Loss Peak ◽  
Charge Polarization ◽  
Peak Value

In order to realize the diagnosis of water distribution, this paper analyzes the interface polarization and macroscopic space charge polarization mechanism when the water distribution is non-uniform. The experimental results of this paper and bushing show that when the moisture distribution is non-uniform, there is a significant loss peak in the tanδ-f curve. The loss peak shifts to higher frequencies as the non-uniformity coefficient increases. There are common intersection points between multiple tanδ-f curves. Further, this paper realizes the diagnosis of the location of moisture distribution through Frequency Domain Spectroscopy (FDS) testing of different voltages and different wiring methods based on the macroscopic space charge polarization. In the single-cycle FDS test, when the positive electrode is first added to the area with higher moisture content, the amplitude of the tanδ-f curve is smaller. The tanδ-f curves under different wiring methods constitute a “ring-shaped” loss peak. As the voltage increases, the peak value of the loss peak shifts to the lower frequency band. As the temperature increases, the peak value of the loss peak shifts to higher frequencies. Based on the above rules and mechanism analysis, this research provides a new solution for the evaluation of moisture content of oil-immersed polymers equipment.

Space charge polarization induced memory in SmNiO3/Si transistors

2013 ◽  
Vol 102 (7) ◽  
pp. 072102 ◽  
Author(s):  
Sang Hyeon Lee ◽  
Moonkyung Kim ◽  
Sieu D. Ha ◽  
Jo-Won Lee ◽  
Shriram Ramanathan ◽  
...  
Keyword(s):  
Space Charge ◽  
Space Charge Polarization ◽  
Charge Polarization

scholarly journals Numerical Model of Radical Photopolymerization Based on Interdiffusion

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Shuhei Yoshida ◽  
Yosuke Takahata ◽  
Shuma Horiuchi ◽  
Hiroyuki Kurata ◽  
Manabu Yamamoto
Keyword(s):  
Diffusion Coefficient ◽  
Numerical Model ◽  
Reaction Rate ◽  
Beam Propagation Method ◽  
Reaction Model ◽  
Experimental Results ◽  
Hologram Recording ◽  
Elementary Reactions ◽  
Proposed Model ◽  
And Diffusion

An accurate reaction model is required to analyze the characteristics of photopolymers. For this purpose, we propose a numerical model for radical photopolymerization. In the proposed model, elementary reactions such as initiation, propagation, and termination are considered, and we assume interdiffusion for each component in the material. We analyzed the diffraction characteristics of a radical photopolymer based on the proposed interdiffusion model with the beam propagation method. Moreover, we also performed hologram-recording experiments and evaluated the diffraction characteristics of the photopolymer medium. By comparing the numerical and experimental results, medium parameters such as reaction rate and diffusion coefficient can be estimated. We confirmed that the interdiffusion model can reproduce the experimental results and showed that the medium parameters affect the diffraction characteristics.

Sign in / Sign up

Export Citation Format

Share Document