Extended Data Fig. 2: Defect types of foreign particles in BCC lattice.
a, Substitutional: A single foreign particle occupies a lattice site. b, Interstitial: A single foreign particle occupies an interstitial site. c, Substitutional interstitial pair: One foreign particle occupies a lattice site and the other an interstitial site. d,e, Defect chain: Substitutional-interstitial pairs form a defect chain, with crystal order decreasing as the number of foreign particles in the chain increases. f, Cluster: Foreign particles aggregate into a cluster, causing geometric frustration that impedes crystallization.
