Density-Functional Pseudopotential Approach to Crystal Phase Stability and Electronic Structure

We show that a first-principles nonlocal pseudopotential theory, based on an all-electron density-functional formalism, provides an essentially exact topological separation of both the octet ANB^8-N structures and the suboctet ANB^P-N(3<~P<~6) structures for 77 and 56 non-transition-metal compounds, respectively. These pseudopotentials which also yield accurate descriptions of atomic and bulk solid electronic structure have been computed for 68 transition and nontransition elements.