  We explore the stability of structure exhibiting hybridization gaps across a
broad range of binary and ternary intermetallic compositions by means of band
structure and total energy calculations. This search reveals previously unknown
metal-based insulators, some with large gaps exceeding 1 eV, such as Al2Fe and
Al4IrRe. We confirm large gaps using a hybrid density functional including
exact exchange, and predict a gap of 2.2 eV for AlMnSi in the Pearson type tP6
structure, which is a chemically ordered ternary variant of the prototype MoSi2
(Pearson type tI6) structure.
