Nanocrystalline microstructure in Sm³⁺ and Gd³⁺ doped K₂O–MgO–Al₂O₃–SiO₂–F glass-ceramic sealant (SOFC)

Abstract

In order to demonstrate the effects of Sm3+ and Gd3+ ions on the crystalline microstructures of the magnesium-boro-alumino-silicate (MBAS) system, the K2O–MgO–B2O3–Al2O3–SiO2–F glass doped with 0–5 mol% Sm2O3 and Gd2O3 were synthesized by melt-quenching (1550 °C).

Performance evaluation for Ag and Au nanoparticle containing K2O‐MgO‐B2O3‐Al2O3‐SiO2‐F glass sealants for SOFC application

“…The CTE of the Silicate‐based (Si‐O‐Si) glass sealants at SOFC operation temperature is another crucial parameter to determine their thermal stability 18,33 . CTE of the heat‐treated glass‐ceramics sealants should be comparable with other SOFC component materials viz.…”

“…During crystallization at 800–900°C, catalytic efficiency of Ag and Au nanoparticles promote heterogeneous phase separation within the base glass matrix so that numerous crystalline peaks appear in the corresponding XRD profiles 13 . The overlapping of several crystalline peaks also leads to the widening of these XRD peaks 18,19 . The peaks at $$2\theta \ = \ 26.7,\ 34.1,\ 36.7,\ 39.8,\ 53.4,\ 60.4\ and\ 71.1^\circ $$ correspond to (022), (131), (041), (210), (241), (311), and (341) crystal planes of Mg‐fluoride Silicate, that is, norbergite (Mg 2 SiO 4 .MgF 2 ) phase (Figure 2II).…”

“…The CTE of the Silicate-based (Si-O-Si) glass sealants at SOFC operation temperature is another crucial parameter to determine their thermal stability. 18,33 CTE of the heat-treated glass-ceramics sealants should be comparable with other SOFC component materials viz. ceramic electrolyte (8YSZ, 10.6 × 10 −6 K −1 ) or metallic interconnect (e.g., Crofer-22 APU, 11.9 × 10 −6 K −1 at 800 • C).…”

“…Norbegite is characterized having molecular weight of 203 and orthorhombic crystal structure (primitive, lattice parameter 𝑎 = 4.710 Å, 𝑏 = 10.27 Å, 𝑐 = 8.747 Å). 18 The XRD peaks corresponding to the norbergite phase for NPG-1 glass-ceramics (Figure 2A′) are all retained for NPG-2 glass-ceramics (Figure 2B′). In addition, certain other peaks corresponding to (241) and (341) planes of norbergite phase appeared at 2𝜃 = 53.4 and 62.7 • , respectively (Table 2).…”

“…13 The overlapping of several crystalline peaks also leads to the widening of these XRD peaks. 18,19 The peaks at 2𝜃 = 26.7, 34.1, 36.7, 39.8, 53.4, 60.4 𝑎𝑛𝑑 71.1 • correspond to (022), ( 131), ( 041), ( 210), ( 241), (311), and (341) crystal planes of Mg-fluoride Silicate, that is, norbergite (Mg 2 SiO 4 .MgF 2 ) phase (Figure 2II). Norbegite is characterized having molecular weight of 203 and orthorhombic crystal structure (primitive, lattice parameter 𝑎 = 4.710 Å, 𝑏 = 10.27 Å, 𝑐 = 8.747 Å).…”