Screw-dislocation constrictions in face-centered cubic crystals

Activated states for cross-slip at screw dislocation intersections in face-centered cubic nickel and copper via atomistic simulation

We extend our recent simulation studies where a screw dislocation in face-centered cubic (fcc) Ni was found to spontaneously attain a low energy partially cross-slipped configuration upon intersecting a forest dislocation. Using atomistic (molecular statics) simulations with embedded atom potentials, we evaluated the activation barrier for a dislocation to transform from fully residing on the g...

Cryogenic nanoindentation size effect in [0 0 1]-oriented face-centered cubic and body- centered cubic single crystals

Dislocation kink-pair energetics and pencil glide in body-centered-cubic crystals.

When body-centered-cubic crystals undergo plastic deformation, the slip planes are often noncrystallographic. By performing atomistic simulation on the activation pathway of dislocation jumps in bcc iron, we show that the main reason for bcc crystals to exhibit this phenomenon is that one type of kink pair has significantly lower energy than all the other types on the same slip plane. Dislocati...

Slanted stacking faults and persistent face centered cubic crystal growth in sedimentary colloidal hard sphere crystals†

Hard sphere crystal growth is a delicate interplay between kinetics and thermodynamics, where the former is commonly thought to favour a random hexagonal close packed structure and the latter leads to a face centered cubic crystal. In this article, we discuss the influence of slanted stacking faults on the growth of sedimentary colloidal crystals from dispersions with high initial volume fracti...

Mie resonances of dielectric spheres in face-centered cubic photonic crystals.

With use of plane waves as a basis for the band-structure calculation of a periodic assembly of highly refringent microspheres, it can be shown that resonance-mode frequencies of isolated dielectric spheres show up in the band structures. The strongly localized bands provided by the photonic-crystal analysis is compared with exact calculations made in spherical symmetry for an isolated microsph...