Abstract: A glass ceramic material sealed fuel cell device, including a first fuel cell portion and a sealant layer bonded to the first cell portion. The sealant layer includes at least three metal oxides RO-M2O3—SiO2 combined together. R is selected from the group consisting of zinc, strontium, calcium, magnesium and combinations thereof. M is selected from the group consisting of aluminum, boron, lanthanum, iron and combinations thereof. RO is present in an amount of between about 45 mol % and about 55 mol %. M2O3 is present in an amount of between about 5 mol % and about 10 mol %. SiO2 is present in an amount of about 40 mol %. RO includes RnO present in an amount of at least about 5 mol %.

Abstract: A glass composition for use as a sealant or otherwise bonded to a fuel cell component, including from about 40 mol % to about 60 mol % RO; from about 2 mol % to about 10 mol % M2O3; and from about 35 mol % to about 45 mol % SiO2. R is selected from the group including strontium, calcium, magnesium and zinc and combinations thereof. M is selected from the group including aluminum, boron, lanthanum, iron and combinations thereof. The glass includes at least about 5 mol % ZnO. Upon heat treatment, the glass at least partially crystallizes with the formation of at least one alkaline earth-zinc pyrosilicate crystalline phases.

Abstract: A glass composition for use as a sealant or otherwise bonded to a fuel cell component, including from about 40 mol % to about 60 mol % RO; from about 2 mol % to about 10 mol % M2O3; and from about 35 mol % to about 45 mol % SiO2. R is selected from the group including strontium, calcium, magnesium and zinc and combinations thereof. M is selected from the group including aluminum, boron, lanthanum, iron and combinations thereof. The glass includes at least about 5 mol % ZnO. Upon heat treatment, the glass at least partially crystallizes with the formation of at least one alkaline earth-zinc pyrosilicate crystalline phases.