Brittle Behavior in Aspirin Crystals: Evidence of
Spalling Fracture
Posted on 2021-01-27 - 15:05
Single
crystals of aspirin form I were cleaved and indented on
their dominant face. Upon inspection, it was possible to observe strongly
anisotropic shallow lateral cracks due to the extreme low surface
roughness after cleavage. Atomic force microscopy (AFM) imaging showed
spalling fractures nucleating from the indent corners, forming terraces
with a height of one or two interplanar spacings d100. The formation of such spalling fractures in aspirin
was rationalized using basic calculations of attachment energies,
showing how (100) layers are poorly bonded when compared to their
relatively higher intralayer bonding. An attempt at explaining the
preferential propagation of these fractures along the [010] direction
is discussed.
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Gabriele, Benjamin
P. A.; Williams, Craig J.; Stauffer, Douglas; Derby, Brian; Cruz-Cabeza, Aurora J. (2021). Brittle Behavior in Aspirin Crystals: Evidence of
Spalling Fracture. ACS Publications. Collection. https://doi.org/10.1021/acs.cgd.0c01662