Abstract
Electroless nickel and mixtures of nickel and phosphorus powders were studied by differential thermal analysis. The evolution of heat during the rise of temperature of the electroless nickel specimens is either 17 or 11% of the heat of formation of , which is the final reaction product. The value of 17% corresponds to electroless nickel with phosphorus contents ≤8 w/o, that of 11‐ to contents > 10 w/o. X‐ray analysis has shown that the reaction product is and that no other phosphide is present. Thus one may assume, that electroless nickel in the as‐plated state is a supersaturated solid solution of phosphorus in nickel as a metastable intermediate state between that of a mixture of nickel plus phosphorus and the equilibrium system of nickel plus .
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