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,　(Ca(0.9)Z(0.03))(2)(Al0.63Zn0.37)(Si0.69Al0.31)(2)O-7　and　Ca2ZnSi2O7,　in　the　reaction　couples　between　boroaluminosilicate　sealing　glass　ceramics　and　GDC　powders　held　at　700　degrees　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,　(Ca(0.9)Z(0.03))(2)(Al0.63Zn0.37)(Si0.69Al0.31)(2)O-7　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.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.