The equilibrium Diagram of the system nickel-silicon has been thoroughly investigated by means of thermal, microscopic, X ray, and magnetic analyses, and a new diagram has been proposed. In this system there exist six compounds, i.e., Ni5Si
2, Ni
2Si, NiSi, Ni
3Si, NiSi
2, and Ni
3Si
2. The first three primarily crystalise from liquid, the melting points of which being respectively 1, 255°C, 1, 285°C, and 992°C, while the next three are formed by the following peritectic or peritectoid reactions:
θ is a solid solution of the crystal type of Ni
2Si containing 23·5 per cent. silicon, and the compound NiSi
2 undergoes an allotropic change at 981°C.
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