Sealing materials, solid oxide fuel cells utilizing such materials and a method of making such materials

According to one embodiment a solid oxide fuel cell device incorporates a seal resistant to hydrogen gas permeation at a in the range of 600°C to 900°C, the seal having a CTE in the range of 80x10-7/°C to 120x10-7/°C, wherein the seal comprises a sealing material being highly crystalline, with at least 70 vol% crystalline phase, the sealing material comprises: (i) 80 to 100 wt % of glass frit, wherein the glass frit composition includes in mole% MgO, 0-10% CaO, 0-30% BaO, 30-50% B2O3, greater than 19% and less than 40% Al2O3, 10-30% SiO2, 10-30%; and (ii) a filler, 0 wt % to 20 wt%.