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(A) An SEM image of the specimen prepared in Ref [30]. The Si3N4 grains show high aspect ratios and form an interlocking structure. (B) Low-magnification TEM micrographs of the materials. (C) High-resolution TEM images of the amorphous phase at the grain pockets. This image is reprinted with permission from Ref. [30]. Copyright 1998 Elsevier Publishing Group.
