Effect of BaO on the crystallization kinetics of glasses along the Diopside–Ca-Tschermak join

Structure, Sintering, and Crystallization Kinetics of Alkaline‐Earth Aluminosilicate Glass–Ceramic Sealants for Solid Oxide Fuel Cells

“…The T c and T p values for glasses 10 and 10A were almost similar (Table II); they shifted toward higher temperature with increase in BaO content in the glasses with glass 10D showing the highest value of T p among all the five glasses. These results are in good agreement with our previous study, 25 while they contradict the results of Ghosh et al 24 The reason for this contradiction is similar to that described for the discrepancies observed in T g values.…”

Development and performance of diopside based glass-ceramic sealants for solid oxide fuel cells

“…The corresponding mean values may be taken as the most probable value of the quoted exponent. In accordance with our previous results [13], an intermediate crystallization mechanism (both surface and bulk) has been observed in all the investigated glasses ( Table 3). The inconsistency in the results of E c values with those reported in our previous study [4] is due to the fact that in the present investigation the calculations have been made in accordance with the actual crystallization parameters.…”

“…The glass composition 7A showed the highest E c value among all the investigated sealant compositions. The E c of La 2 O 3 containing Di-based GC sealants is lower than La 2 O 3 -free Di-Ca-Ts GC sealants [13] while E c decreases with further increase in La 2 O 3 content. This decrease in E c with increase in La 2 O 3 may be due to the network modifying effect and clustering of La 3+ ions (La-O-La linkages) in the glass structure [4].…”

“…Although numerous sealants have been proposed for SOFC [12], very few studies related with crystallization kinetics of GC sealants have been reported in literature [3,[13][14][15]. Crystallization process plays an important role in determining the properties and applications of GC sealants.…”

New glass and glass–ceramic sealants for planar solid oxide fuel cells

“…Furthermore, glass-ceramics can have thermal expansion coefficients very different from the parent glass, due to the different crystalline phases and their relative proportions. [17][18][19][20][21][22][23][24][25] In order to develop a suitable glass-ceramic sealant, it is therefore necessary to understand the crystallization kinetics, the sealing properties and the chemical interactions when in contact with other components of the cell. 26,27 Many authors report studies on barium aluminosilicate sealants; these sealants have shown high reactivity with the metallic interconnect at 800-900 • C forming a porous and weak interface composed of barium chromate (BaCrO 4 ) and monocelsian (BaAl 2 Si 2 O 8 ) 28,29 ; aluminization by aerosol spraying of the Crofer22APU surface has been reported to be a viable approach to prevent adverse reaction between Cr-containing metallic interconnects and alkaline-earth silicate sealing glasses containing Ba or Sr. 30 Concerning other glass compositions, phosphate and borate glasses are not sufficiently stable in a humidified fuel gas environment.…”