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When the solute atom is fairly similar in size to that of the solvent, for example chromium dissolved in either α-orγ-Fe iron, then solute atoms will substitute for some of the solvent atoms and the result is calls a “substitutional solid-solution”. It is important that in both substitutional and interstitial solid-solutions the sites occupied by specific atoms are random, consequently adding the solute does not change the crystal structure .In contrast, in an intermetallic compound, such as NiAl, the different atoms sit on specific sites. NiAl, for example, is a cubic structure in which nickel atoms sit at the cube corners and aluminum at the body center. Since each cube corner side is shared by eight unit cells and each body center site is entirely within a unit cell, this produces:
8 corner sites/8 unit cells sharing each site=1 nickel atom per unit cell
1 body center site/1 unit cell containing the site=1 aluminum atom per unit cell
This gives a nickel atom to alumi

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