The　insufficient　thermal-mechanical　stability　of　sealing　interface　presents　a　challenge　for　the　development　of　solid　oxide　fuel　cells　(SOFCs).　Here　we　report　for　the　first　time　that　the　presence　of　gadolinia-doped　ceria　(GDC)　electrolyte　leads　to　the　formation　of　two　hardystonite　phases,　(Ca0.9Zn0.03)2(Al0.63Zn0.37)(Si0.69Al0.31)2O7　and　Ca2ZnSi2O7,　in　the　reaction　couples　between　boroaluminosilicate　sealing　glass-ceramics　and　GDC　powders　held　at　700°C　for　30　days.　Similarly,　the　aggregation　of　these　two　hardystonite　phases　also　occurs　at　the　interface　between　GDC　and　sealing　glass-ceramics　under　identical　heat-treatment.　In　particular,　(Ca0.9Zn0.03)2(Al0.63Zn0.37)(Si0.69Al0.31)2O7　becomes　the　dominant　phase　at　the　sealing　interface　when　the　heat-treatment　time　increases　from　7　days　to　30　days.　Moreover,　the　sealing　interface　remains　intact　after　thermal　cycles　for　100　times,　indicating　the　excellent　thermal-mechanical　stability　of　hardystonite　phases.　Finally,　the　possible　mechanism　on　the　phase　evolution　of　glass-ceramic　at　the　sealing　interface　has　been　proposed.　©　2015　Elsevier　Ltd.