Page 223 - Materials Chemistry, Second Edition
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210 3 Metals
Figure 3.31. The tetrahedral framework for Laves phases MgCu 2 , MgZn 2 , and MgNi 2 . The Mg atom is
too large for tetrahedral sites; they fit into large cages formed by the tetrahedra. The packing layers are
partially filled alternating P3/4 and P1/4. MgCu 2 is cubic and the sequence of layers along the packing
direction (the body diagonal of the cube) is ACB ACB. MgZn 2 and MgNi 2 are hexagonal. The sequence of
packing layers is AB CB AB for MgZn 2 and AB CB AC BC for MgNi 2 . Reproduced with permission from
Structure and Chemistry of Crystalline Solids, Douglas, B. E.; Ho, S. -M. Springer: New York, 2006.
Copyright 2006 Springer Science and Business Media.
