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http://dx.doi.org/10.3740/MRSK.2007.17.8.414

Relations between Composition, Temperature and Electrical Conductivity of (60-xSiO2-40Na2O-xCaO(x=0∼15wt%) Glass System  

Jung, Y.J. (Division of Materials Science and Engineering, Pusan National University)
Lee, K.H. (Division of Materials Science and Engineering, Pusan National University)
Kim, T.H. (Division of Materials Science and Engineering, Pusan National University)
Kim, Y.S. (Division of Materials Science and Engineering, Pusan National University)
Chin, H.J. (Division of Materials Science and Engineering, Pusan National University)
Ryu, B.K. (Division of Materials Science and Engineering, Pusan National University)
Publication Information
Korean Journal of Materials Research / v.17, no.8, 2007 , pp. 414-419 More about this Journal
Abstract
We report the electrical conductivity of the mixed alkali silicate glasses in the system (60-x)$SiO_2-40Na_2O-xCaO(x=0\sim15wt%)$ in the temperature range from $150^{\circ}C$ to $620^{\circ}C$. In the range from $150^{\circ}C$ to glass transition temperature$(T_g)$, the electrical conductivities of glass samples had a tendency to be proportion with temperature. The glasses of containing over 7.5wt% CaO showed lower conductivities than the glasses of containing 0 and 5wt% CaO because two kinds of alkali ions$(Na^+,\;Ca^{2+})$ were obstructed each other. On the other hand, in the range from $T_g$ to $620^{\circ}C$, the electrical conductivity of glasses($7.5{\leq}x{\leq}12.5$) was unstable and decreased in some region. From XRD results, the $Na_4Ca(SiO_3)_3$ phase were observed in these glasses. This means the alkali ions didn't behave as carrier, it seems that this caused the conductivities decrease. In case of glass of containing 15wt% CaO, any crystal phase were not observed. This means the alkali ions behaved as carrier, it consequently seems the conductivity increased.
Keywords
$SiO_2-Na_2O-CaO$ glass; Conductivity; Crystallization; High and/or Low Temperature Region; $Na_4Ca(SiO_3)_3$ phase;
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