Intermetallics and solid solution

  1. Aug 16, 2014 #1


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    Gold Member

    For some systems, discrete intermediate compounds rather than solid solutions may be found on the phase diagram, and these compounds have distinct chemical formulas; for metal–metal systems, they are called intermetallic compounds. e.g. Mg2Pb has 33 at% Pb

    For binary isomorphous system like copper-nickel, if we get 33 at% Ni, can we say it is Cu2Ni? How to distinguish intermetallics from other solid solution with same ratio?
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  3. Aug 16, 2014 #2


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    Staff: Mentor

    Usually, if the crystal structure of the predominant element is unchanged, then it is considered a solid solution. Intermetallic compounds are often distinct or separate phases, with a different crystal lattice/structure, e.g., a bcc or fct phase in fcc or hcp lattice.

    We may refer to second phase particles.
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