Accelerated devitrification of a strontiumlanthanumaluminoborosilicate based intermediate temperature solid oxide fuel cell glass sealant and its effect on thermophysical behaviour of the glass ceramics

► Devitrification of a strontiumlanthanumaluminoborosilicate glass was investigated. ► Change in properties of the glass was correlated with the evolution of phases. ► With evolution of SrAl2Si2O8 phase, CTE of the glass ceramics increases. ► With evolution of La10(SiO4)6O3 phase, CTE of the glass ceramics decreases. ► Even on 100 h devitrification at 1000 °C the glass ceramics is suitable for SOFC.