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

(60-x)SiO2-40Na2O-xCaO(x=0∼15wt%)조성유리계의 조성, 온도 및 전기전도도간의 상관특성

  • 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)
  • Published : 2007.08.27

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

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