Abstract
X-ray and metallographic investigations indicated that in the binary intermetallic compounds UNi 5 and ZrNi 5 one nickel atom may be substituted by combinations of some elements of the IIIa-Va and IIb-VIa groups, i.e. that “pseudosilicon” can play the role of a substituent in some AB 5 phases. Single phase alloys were obtained in the systems of the general formula UNi 4Y (Y = In + As, In + Sb, Zn + Te, Cd + Te) and ZrNi 4Y (Y = In + As, In + Bi, Zn + Te, Cd + Te). The homogeneity regions (ratio of the constituent elements of the Y component) were also determined. In all the systems investigated so far, at the equiatomic compositions of the substituents (VEC = 4), contraction of the unit cell parameters and an increase of microhardness values were observed. Intensity calculations showed that the substitution takes place in positions 4(c) in the space group F4̄3m. The resulting structures may also be considered as superlattice of the MgSnCu 4 type. The stability of these phases is discussed in terms of relative atomic sizes and valence electrons concentrations.
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