Cu3Au undergoes a phase transition. At elevated temperatures, it has the structure of Cu, where each...

Cu3Au undergoes a phase transition. At elevated temperatures, it has the structure of Cu, where each position is filled randomly with Cu or gold atoms (i.e. at each position, there is a 1/4 probability that the atom is Au, and a 3/4 probability that the atom is Cu). At lower temperatures, the thermodynamically stable phase is a cubic one with space group Pm3m (#221), with a= 3.74Å. Cu is at (0, 0.5, 0.5) and Au is at (0,0,0).

a.Show unit cells of the ordered version.
b.Compare this structure to that of Cu.
c.Explain why the disordered version is favored at higher temperatures

Expert Solution

queen_honey_blossom answered 2 years ago

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Cu3Au undergoes a phase transition. At elevated temperatures, it has the structure of Cu, where each...

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