Electrophysical characteristics of the near-surface layer of semiconductor ceramics for ZnO varistors
Journal Title: Journal of Physics and Electronics - Year 2018, Vol 26, Issue 1
Abstract
Electrophysical properties of near-surface layer of ZnO varistor ceramics forming during high-temperature annealing in oxidizing gaseous atmosphere are studied. Microstructure of near-surface layer and its electrical properties have features which are determined by an increased concentration of oxygen at surface of pressed ceramic billets in comparison with bulk during annealing. From the data of electron raster microscopy of cross-chipping of varistors, it is defined that the average value of thickness of near-surface layer is 40 μm. It is found that the specific resistivity value of near-surface layer is 5.3·1012 Ω·cm. The electrical capacitance of near-surface layer is calculated from capacitance measurement data for varistors containing such layer under two electrodes and without layers. It is shown that the electrical capacitance of near-surface layer exceeds that of varistor by more than an order. Conclusion is made that the near-surface layer gives a weak contribution to dielectric properties of ZnO varistor ceramics. However contribution of this layer to electrical conductivity of ceramics in pre-breakdown region is significant.
Authors and Affiliations
R. I. Lavrov, V. R. Kolbunov, V. F. Bashev
Keywords
Related Articles
- EP ID EP540677
- DOI 10.15421/331810
- Views 198
- Downloads 0
Application of “PolySwitch” fuses for the limitation of current overloads in photovoltaic systems of solar arrays
The results of experimental study of the transformation of the light current-voltage and volt-watt characteristics for the parallel connections of photovoltaic modules when using “PolySwitch” polymer resettable fuses are...
Optical properties of clusters
In this paper, we discuss in detail the theoretical results obtained with using the local functional density method in parameteric approximation of silicon clusters. One of the main conclusions is that the comparison bet...
An integral equation technique for the analysis of phased array antenna with matching step discontinuities
Applying the integral equation method of overlapping partial domains and the Schwartz alternating method to solving an electromagnetic wave diffraction problem is considered in this paper. The infinite rectangular wavegu...
Lattice vibrations and disorder in crystalline benzoxazoles undergoing excited state intramolecular proton transfer: DFTB modeling
Structure and crystal lattice vibrations are calculated for 2-(2'-hydroxyphenyl)bezoxazole and bis-(2,5-benzoxazolyl)hydroquinone by density functional based tight-binding methods. Despite lowering of the molecular symme...
Effect of thermal treatment on structure and leakage current of Na0.5Bi0.5TiO3 thin films
Na0.5Bi0.5TiO thin films were grown on heated to 200°С Pt/TiO2/SiO2/Si substrates by ex-situ method with high-frequency (13.56 MHz) magnetron deposition. Thermal treatment of the films was carried out at 650°С, 700°С and...