Crack　formation　at　the　interface　between　sealing　glass　and　other　cell　components　is　one　of　the　key　issues　in　constraining　the　development　of　solid　oxide　fuel　cells　(SOFCs).　Herein,　we　report　our　finding　on　tuning　the　mechanical　and　thermal　properties　of　borosilicate　glass　by　doping　Nb2O5.　We　observe　the　formation　of　Ba3Nb10O28　crystalline　phase　in　the　Nb2O5-doped　glass,　leading　to　significantly　enhanced　crack-resistant　and　self-healing　abilities　of　the　glass.　In　addition,　we　demonstrate　long-term　thermal　and　chemical　stability　at　the　sealing　interface　between　the　Nb2O5-doped　glass-ceramics　and　Y2O3-ZrO2　electrolyte　after　heat-treatment　at　700　degrees　C　for　1000　h.　The　possible　mechanism　for　the　improved　crack-resistant　and　self-healing　properties　is　discussed.