BaZn2Si2O7 and the solid solution series BaZn2−xCoxSi2O7 (0<x≤2) as high temperature seals for solid oxide fuel cells studied by high-temperature X-ray diffraction and dilatometry

• We examined the thermal expansion of solid solutions BaZn2−xCoxSi2O7 (0• BaZn2Si2O7 exhibits the highest thermal expansion due to a phase transition.
• Substitution of small amounts of Zn2+ against Co2+ lead to decreasing thermal expansion.
• The thermal expansions re-increased with further increasing Co2+ concentrations.
• Seals based on these solid solutions should be suitable for solid oxide fuel cells.

For sealing of solid oxide fuel cells, glasses from which crystalline phases with high coefficient of thermal expansion (CTE) can be crystallized are required. In this paper, a new solid solution series BaZn2−xCoxSi2O7 (0

The composition of the solid solution BaZn2−xCoxSi2O7 strongly affects the thermal expansion.Figure optionsDownload as PowerPoint slide