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What kind of solid solution is found in a Cu-Ni crystal?

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What kind of solid solution is found in a Cu-Ni crystal?

(a) Interstitial solid solution

(b) Substitutional solid solution

(c) Supersaturated solution

(d) Unsaturated solution

This question was addressed to me in an online quiz.

My question is taken from Hume Rothery’s Rules, Types of Solid Solutions in portion Solid Solutions & Crystallography of Engineering Material & Metallurgy

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The correct option is (b) Substitutional solid solution

The explanation: The Cu-Ni system obeys Hume Rothery’s laws of similar atomic radii (1.28 and 1.25), same FCC crystal structure, similar valencies (+1 and +2), and similar electronegativities (1.9 and 1.8). These elements are completely soluble in one another and form a substitutional solid solution.

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