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The Ni-Pt phase diagram in [Massalski2] was redrawn from [1991Nas], which was based on experimental data reported before 1981. Phase boundaries of low-temperature ordered phases have not been well defined.
[1986Cad] reported the phase boundaries of the ordered Ni3Pt, NiPt, and NiPt3 phases. (The NiPt3 phase was missing in the diagram of [1991Nas].) However, boundaries of the low-temperature part of these phases were not well defined.
Ni-Pt crystal structure data
Composition, at.% Pt