Electrical Parameters of SnO2 Based Varistor Ceramics with CaO and BaO Additions
Journal Title: Фізика і хімія твердого тіла - Year 2016, Vol 17, Issue 1
Abstract
In the tested SnO2-Co3O4-Nb2O5-Cr2O3-CuO varistor ceramics the adding of CaO or BaO oxides leads to the decrease of the electric conductivity in the low electric field and correlated increase of the potential barrier height at the SnO2 grain boundaries (from 0.7 to 1.0 eV). The coordinated changes of electrical parameters with the increase of the burning temperature from 1520 to 1620 К (the increase of the linear shrinkage, a grain size, an electric conductivity, a nonlinear coefficient , a normalized nonlinear coefficient , a dielectric permittivity and the decrease of the qualifying electric field E1, an activation energy of electric conduction and a grain specific resistance) prove the barrier mechanism of electric conductivity in the SnO2 based ceramics. The highest data and = 0.02 cm•V-1 has ceramics with CaO addition baked at 1620 K. According to the impulse experimental data in the high electric field the increase of burning temperature causes the increase of SnO2 grain average size and the decrease of their grain specific resistance . The obtained value = 1.1 Ohm•cm for SnO2-Co3O4-Nb2O5-Cr2O3-CuO ceramics is the lowest among those found in SnO2 based ceramics. The addition of CaO or BaO increase the grain specific resistance and decrease their average size.
Authors and Affiliations
O. V. Gaponov, A. M. Vasyliev
Keywords
Related Articles
- EP ID EP255613
- DOI 10.15330/pcss.17.1.81-87
- Views 75
- Downloads 0
Hydrothermal Synthesis of Nanodispersed Titanium Dioxide
The paper is an overview of published data within the perspective method of hydrothermal synthesis of nanodispersed titanium dioxide. Organizing data allowed to capture the general trends of the relationships between the...
On the Role of Mesoentropy in Thermodynamics of First Order Phase Transformations in Alloys
A thermodynamics of a new phase formation in a binary alloy, taking into account the chemical depletion and the size distribution of new phase nuclei giving the energy input at high temperatures, is considered. It is sho...
Scientific Rationale for the Model Situation of Destruction of Carbon Fibers and Crack Formation in the Matrix
By results of researches where found depends of stored energy before rupture of various types of carbon fibers, and found their dependence on physical and mechanical properties of samples. Displaying influence of stored...
The Thermoelectric Solar Generator
Developed a comprehensive system for generating of electric energy “Thermoelectric generator – solar collector”. The Sb doped PbTe (n-type of conductivity) and triple compound PbSnTe (p-type of conductivity) were synthes...
Phase Equilibria in MeIMeIIIP2S6(Se6) Systems Which Include Quaternary Compounds (MeI - Cu, Ag; MeIII - In, Cr)
The interactions of 6 quazibinary systems were investigated by methods of physical and chemical analysis in order to study the formation of solid solutions inside them. The character of interaction in these systems depen...