Structural, thermal and crystallization kinetics of ZnO–BaO–SiO2–B2O3–Mn2O3 based glass sealants for solid oxide fuel cells |
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Authors: | Anu Arora Vishal Kumar K. Singh O.P. Pandey |
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Affiliation: | School of Physics and Materials Science, Thapar University, Patiala 147004, India |
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Abstract: | Glass compositions in the system 40SiO2–30BaO–20ZnO–(x)Mn2O3–(10 − x)B2O3 glasses have been synthesized and the thermal, structural and crystallization kinetic properties characterized. The lower concentration of Mn2O3 in place of B2O3 acts as a network former and suppressed the tendency of phase separation in glasses. On the other hand, concentration of Mn2O3 > 7.5 mol% induce phase separation in the glass matrix. The highest activation energy for crystallization is observed in the composition without B2O3 (INM4) (355 kJ/mol). The values of thermal expansion coefficient (TEC) and viscosity of this glass is 8 × 10−6 K−1 and 104.2dPa s (850 °C), respectively. After long heat treatment (800 °C for 100 h), thermodynamically stable hexacelsian and monoclinic phases are formed. These phases are not detrimental to SOFC application. |
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Keywords: | Scanning electron microscopy X-ray diffraction Fuel cells Glass |
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