Interfacial　reactions　between　a　sealing　glass-ceramic　and　electrolyte　present　a　challenge　for　the　development　of　sealing　materials.　In　this　paper,　we　report　for　the　first　time,　the　interfacial　reaction　between　Hf-containing　borosilicate　glass-ceramics　and　8　mol.%　yttria-stabilized　zirconia　(8YSZ)　electrolyte.　The　results　show　that　the　interdiffusion　between　the　glass-ceramics　and　the　8YSZ　can　be　confined　to　a　similar　to　2　mu　m　zone　at　the　interface.　Additionally,　the　HfO2　dopant　can　inhibit　the　formation　of　monoclinic　ZrO2　and　zirconates　in　the　reaction　couples　of　glass-ceramics　and　8YSZ,　which　can　be　attributed　to　the　Hf-containing　phase　formation,　e.g.,　Ca6Hf19O44　and　Ca3HfSi2O9.　Moreover,　the　formation　of　the　Hf-containing　phases　contributes　to　a　low　conductivity　of　the　glass-ceramics,　e.g.,　1.9　x　10(-7)　to　1.6　x　10(-6)　S　cm(-1)　at　700　degrees　C.　These　results　demonstrate　the　suitability　of　the　Hf-containing　glass-ceramics　as　sealing　materials　for　SOFC　applicatiOns.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.