The empirical formulae of intermetallic compounds by neutron activation

Neutron activation analysis was applied to the deterinination of the empirical formulas of some Tc-Al and Mo--Al compounds. An outline of the technique is given. The method is of general application and is particularly suitable when accurate results are required from limited quantities (ca 5 mg) of material. The results on Al-Mo and Al - Tc alloys were sufficiently consistent to indicate probable crystallographic formulas of MoAl/sub 12/ and TcAl/sub 12/ with milligram quantities of material. (P.C.H.)