4 Electron phase (Electron compounds For Alloys of IB or transition metals, and B group metals phases with sane or similar structure occur at approximately some electron concentration(ela) these alloys are therefore called as electron compounds4. Electron Phase (Electron compounds) For Alloys of IB or transition metals, and B group metals phases with sane or similar structure occur at approximately some electron concentration(e/a) these alloys are therefore called as electron compounds