Abstract
We show that, notwithstanding the isotropic nature of Miedema's semiempirical theory for the heat ΔH of formation of intermetallic phases and contrary to the present view in the literature, the parameters φ ∗ and n ws used to predict the signs of ΔH can contribute quantitatively to our understanding of structural phenomena. On a ( Δφ ∗ , Δn ws 1 3 ) map considerable resolution is obtained among the binary systems in which different structure types occur, showing the importance of the energy of formation of an intermetallic compound in deciding the crystal structure that it adopts. This is demonstrated for binary systems where AsNa 3, TiNi 3 and CeCu 2 structure types exist.
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