Abstract
The electrical conductivity of the 40Na2O:50SiO2:10B2O3 glass-dispersed Na2CO3 composite solid electrolyte system, prepared by liquid phase sintering, is systematically investigated using complex impedance spectroscopy. The unreacted glass glues the Na2CO3 grains together, which not only reduces the micropores but also improves the ionic conductivity and mechanical strength of the pellet. The conductivity enhancement in such a composite solid electrolyte system is discussed in the light of the increased concentration of charge carriers in a diffuse space charge layer formed at the crystalline-glass interface. A galvanic CO2 gas sensor using an optimised composite electrolyte (50 wt% glass-dispersed Na2CO3) is found to be more stable against thermal cycles (heating and cooling) vis-a-vis the sensor based on a pure crystalline solid electrolyte.
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