SYNTHESIS AND CHARACTERIZATION OF THE B2S3-LI2S, THE P2S5-LI2S AND THE B2S3-P2S5-LI2S GLASS SYSTEMS

A glass processing method that employs a carbon-coated quartz container was used to study the B2S3 containing glasses i.e. (1-x) B2S3-xLi2S and 0.33[(1-y)B2S3-yP2S5]-0.67Li2S, which are extremely reactive towards quartz at temperatures above 400°C. This technique resulted in transparent glasses with a high Li2S content (0.5≤x≤0.75) for the (1-x)B2S3-xLi2S system. The glass forming region for the (1-x) P2S5-xLi2S glass system was expanded from 0.66≤x≤0.68 in previous studies to 0.5≤x≤0.7. The thermal behavior and the Li+ ionic conductivity of these glasses were analyzed. An exothermal peak was found during the glass transition for some B2S3 containing glasses, and the peak could be converted into a second glass transition by annealing at the peak temperature. The coformer sulfide glasses of the 0.33[(1-y)B2S3-yP2S5]-0.67Li2S system generally exhibited higher Li+ ionic conductivity than that of the single sulfide network former glasses, the room temperature conductivity of the glass with y=0.3 reached the value of 0.141 mS/cm. © 1990.