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Intermetallics and solid solution

by kelvin490
Tags: intermetallics, solid, solution
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kelvin490
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Aug16-14, 08:03 AM
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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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Astronuc
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Aug16-14, 07:06 PM
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Quote Quote by kelvin490 View Post
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?
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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