Atomie Arrangement in the Homogeneity Range of the Laves Phases ZrFe₂ and TiFe₂

The Laves phases ZrFe 2 (MgCu 2 type) and TiFe 2 (MgZn 2 type) have a homogeneity range of several atomic percent (mainly on the side rich in iron). An investigation is made of the modifications to this type of AB 2 lattice which result from an excess of B‐atoms. X‐ray and neutron diffraction measurements show that for both ZrFe 2 and TiFe 2 the excess B‐atoms are associated with the sites of A‐atoms. The concentration variation of the lattice constants confirms these results.