J. Gruber, M. W. Barsoum, G. J. Tucker. Characterization of ripplocation mobility in graphite[J]. Materials Research Letters, 2020, 8(2): 82-87.
DOI:
J. Gruber, M. W. Barsoum, G. J. Tucker. Characterization of ripplocation mobility in graphite[J]. Materials Research Letters, 2020, 8(2): 82-87.DOI: 10.1080/21663831.2019.1702115.
Characterization of ripplocation mobility in graphite
BSTRACTRecent work suggests that layered solids deform through buckling of basal planes. When isolated locally
as in graphite
these buckles
termed ripplocations
behave superficially similar to dislocations
but have no Burgers vectors. Through atomistic simulations
we demonstrate the easy transitions of ripplocations in graphite between many closely-spaced energy states
even at low temperatures. Between 60 and 350 K
their migration barrier is estimated at 32 meV
independent of segment length. Ripplocations spontaneously migrate towards vacancies and away from compressive stresses. These results shed more light on this new micromechanism and potentially explain experimental observations that evade sufficient description through dislocation-based models.