Coarsening mechanism of LiAlO2 in acidic and basic molten carbonate salts

[Display omitted] •The coarsening behavior of α-LiAlO2 in molten carbonate was studied under different pCO2.•The particle growth of LiAlO2 is accelerated with α–γ phase transition in low pCO2.•The crystal growth in basic melt conditions is dominated by Ostwald ripening.•Oriented attachment growth oc...

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Bibliographic Details
Published in:Corrosion science 2021-09, Vol.190 (C), p.109691, Article 109691
Main Authors: Heo, Su Jeong, Hong, Junsung, Singh, Prabhakar
Format: Article
Language:English
Subjects:
Corrosion mechanisms
Crystal growth
Crystals
Gamma phase
LiAlO2
Molten carbonate fuel cells
Nanocrystals
Oriented attachment
Ostwald ripening
Phase transition
Phase transitions
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Summary:[Display omitted] •The coarsening behavior of α-LiAlO2 in molten carbonate was studied under different pCO2.•The particle growth of LiAlO2 is accelerated with α–γ phase transition in low pCO2.•The crystal growth in basic melt conditions is dominated by Ostwald ripening.•Oriented attachment growth occurs primarily on (003) plains. Long-term corrosion behaviors of molten carbonate fuel cell (MCFC) electrolyte matrix with LiAlO2 particle coarsening are evaluated in eutectic Li-Na carbonate melts with different pCO2. In low pCO2 (basic), the rapid growth of LiAlO2 particles by Ostwald ripening is observed. TEM analysis verifies the continued process of dissolution and precipitation of LiAlO2 nanocrystals that promotes LiAlO2 crystal growth. It is revealed that this growth process is accompanied by α–γ phase transition through a Li5AlO4 intermediate phase. In high pCO2 (acidic) conditions, oriented attachment, primarily between the (003) and (012) planes of α-LiAlO2 crystals, leads to interparticle coalition and growth.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.109691