  Using a combination of kinetic Activation Relaxation Technique with empirical
potential and ab initio based climbing image nudged elastic band method, we
perform an extensive search of the migration and rotation paths of the most
stable carbon tri-interstitial cluster in cubic SiC. Our research reveals paths
with the lowest energy barriers to migration, rotation, and dissociation of the
most stable cluster. The kinetic properties of the most stable cluster,
including its mobility, rotation behavior at different temperatures and
stability against high temperature annealing, are discussed based on the
calculated transition barriers. In addition to fundamental insights, our study
provides a methodology for investigation of other extended defects in a
technologically important material.
