SO2 CONCENTRATION CELL WITH LI2O-B2O3-LI2SO4 SOLID-ELECTROLYTE

Crystallization of a glass with the composition of 33.9Li(2)O-33.9B(2) O(3)-29Li(2)SO(4)-3.2Al(2)O(3) was investigated by DTA and Dilatation methods. The electrical conductivity of the crystalline glass and the electromotive force (E.M.F.) of the concentration cell made with the c rystalline glass as the solid electrolyte were measured. The results i ndicate that the glass-transition temperature is 650 K and the softeni ng temperature of the crystalline glass is higher than 971 K. The temp erature dependence of the specific conductivity are expressed as follo ws; [GRAPHICS] and their apparent activation energies for electrical c onduction are 100.8 kJ.mol(-1)(593-833 K) and 35.9 kJ.mol(-1)(833-943 K). The concentration cells showed a stable Nernstian E.M.F. correspon ding to the partial pressure of SO2 in a range of 43-800 ppm SO2 in a stream containing 21 kPa O-2. The response time of the cell was 150 to 900 s at 873 K.