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The metal-rich part of the Co-Ni-P system at 800 °C

Czech Geological Survey, Geologická 5, 152 00 Prague 5, Czech Republic

e-mail: drabek{at}cgu.cz

The metal-rich portion of the Co-Ni-P system was studied experimentally at 800 °C by means of evacuated silica glass tube technique. Five binary phases: Co₂P Ni₂P, Ni₁₂P₅, Ni₅P₂, Ni₃P and five ternary phosphides solid solutions: (Co_1–x,Ni_x)₃P, ₁–(Ni_1–xCo_x)₂P (hexagonal), ₂–(Co_1–xNi_x)₂P (orthorhombic), (Co_1–x,Ni_x)₁₂P₅ and (Co_1–x,Ni_x)₅P₂ were found to be stable in the system. Cobalt has a significant influence on the structure of (Ni,Co)₂P solid solutions and, therefore, cobalt contents might change the crystal structure of naturally occurring phosphides with the Ni/P = 2:1 ratio. Ni-rich, cobalt-containing phosphides with the Ni/P ratio = 3:1 and 2:1, isotypic with minerals schreibersite and barringerite, could possibly be found in meteorites. Likewise, phosphides with Ni/P ratio = 12:5 and 5:2 may possibly be found, but in close association with natural Ni-rich phosphides.

Key-words: phase relations, phosphides, Co, Ni, P.