Abstract
The phase diagrams of both NbPd&Al and NbRuAl were investigated in order to elaborate new niobium base alloys, with two-phase structures A 2-B 2 or A 2-L2 1. Three new aluminides were identified. The first, NbRu 2Al, was studied using single-crystal X-ray diffraction data; NbRu 2Al is a Heusler phase alloy with space group Fm 3m and Z = 4, a = 6.135(1) A ̊ , D x = 9.27 g cm −3 , μ( Mo Kα) = 172.4 cm −1 , F(000) = 568, R = 0.033 ( Rw = 0.034) for 37 contributing unique reflections. The other phases, with formula Nb 2(T x Al 1− x ) 4 where T Pd, Ru and 0.17(Pd) (0.19(Ru)) < x < 0.26(Pd) (0.29(Ru)), were characterized by the Laves phase MgZn 2-type structure.
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