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¡± It is well known that the Ni-Ru system is essentially immisciable (!!) at equilibrium and is characterized by a positive heat of formation of 1 kj/mol at an equiatomc stoichiometry. In its equilibrium phase diagram, there  is no alloy phase."

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Originally posted by FLY_Phoenix at 2010-04-14 15:25:14:
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The Ni-Ru system has its heat of mixing being 0 to
small positive value. That is why it is immiscible. According to Thermodynamics of
Solids, the system is positive heat of mixing, one could call it immiscible.
Precisely, immiscible system does not mean they could not form any alloy.

This system is interesting and has its critical value.

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