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Stoichiometry Defect at Grain Boundary Observed by Nano‐Scale TEM Microanalysis in Spinel MgAl2O4

Spinel presents a grain boundary sliding deformation accommodated by diffusion during creep at high temperature. A space charge layer at grain boundary in ionic ceramics can explain the observed interface reaction controlling diffusion at low stress. The purpose of this work is to study the grain boundary region stoichiometry to confirm this theory.