SO2 CONCENTRATION CELL WITH LI2O-B2O3-LI2 SO4 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 (EMF) of the concentration cell made with the crys talline glass as the solid electrolyte were measured. The results indi cate that the glass-transition temperature is 650 K and the softening temperature of the crystalline glass is higher than 971 K. The tempera ture dependencies of the specific conductivity are expressed as follow s; log (sigma/(S . m(-1))) = -5.26 x 10(3)/T + 5.50 (593 similar to 83 3 K), log (sigma/(S . m(-1))) = -1.87 x 10(3)/T + 2.66 (833 similar to 943 K). and their apparent activation energies for conduction are 100 .8 kJ mol(-1)(593 similar to 833 K) and 35.9 kJ mol(-1)(833 similar to 943 K). The concentration cells showed a stable Nernstian EMF corresp onding to the partial pressure of SO2 in a range of 43-800 ppm SO2 in a stream containing 0.21 atm O-2. The response time of the cell was 15 0 to 900 s at 873 K.