Atomic-Level Understanding of “Asymmetric Twins” in Boron Carbide

Atomic-Level Understanding of "Asymmetric Twins" in Boron Carbide.

Recent observations of planar defects in boron carbide have been shown to deviate from perfect mirror symmetry and are referred to as "asymmetric twins." Here, we demonstrate that these asymmetric twins are really phase boundaries that form in stoichiometric B(4)C (i.e., B(12)C(3)) but not in B(13)C(2). TEM observations and ab initio simulations have been coupled to show that these planar defec...

Boron carbide/n-silicon carbide heterojunction diodes

Magnetoresistance in boron carbide junctions

Shock-wave strength properties of boron carbide and silicon carbide

Atomic structure of icosahedral B4C boron carbide from a first principles analysis of NMR spectra.

Density functional theory is demonstrated to reproduce the 13C and 11B NMR chemical shifts of icosahedral boron carbides with sufficient accuracy to extract previously unresolved structural information from experimental NMR spectra. B4C can be viewed as an arrangement of 3-atom linear chains and 12-atom icosahedra. According to our results, all the chains have a CBC structure. Most of the icosa...