A synthesis of the Brewer-Engel and Samsonov-Pryadko-Pryadko electron correlations for metals

A synthesis of the Brewer-Engel and Samsonov-Pryadko-Pryadko electron correlations for metals is presented. Difficulties with both correlations are cleared up. In particular, abandonment of the Brewer-Engel association of sp² ? fcc in favor of a correlation with the number of d electrons eliminates many of the contradictions of that correlation. In general, by placing greater emphasis on the d electrons in transition metals correlations with many solid state properties become much more straightforward.