The GATE Grind

GATE 2023 MT – Question 29

Physical Metallurgy · Crystal defects and interfaces · 1 mark · Multiple select

The condition(s) for high degree of mutual substitutional solid solubility for two metals is/are

  1. metals should have same valence
  2. metals should have same crystal structure
  3. the difference in atomic size of metals should be less than 15%
  4. the difference in electronegativity of metals should be large

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Show answer and explanation

Correct answer: (A) metals should have same valence; (B) metals should have same crystal structure; (C) the difference in atomic size of metals should be less than 15%

Explanation

Hume–Rothery guidelines favour similar atomic sizes, the same crystal structure and compatible valence; size mismatch should generally be below about 15%. A large electronegativity difference instead favours compound formation.

Thus **A,B,C**.