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The aim is to study the phase relationships in the Fe–Ni–P ternary system under high pressure.

The Join FeNi–FeNiP at 6 GPa

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The aim is to study the phase relationships in the Fe–Ni–P ternary system under high pressure.
Conducted experiments in ceramic capsules using a multianvil press.
Investigated the join Fe0.5Ni0.5–(Fe0.5Ni0.5)2P at pressures of 6 GPa and temperatures from 900 to 1600°C.
Characterized the melting behavior of intermediate compounds and eutectic formation.
Identified the eutectic of (Fe, Ni)3P at 18 mol % P and 1000°C.
Observed that (Fe, Ni)3P melts incongruently at 1075°C to yield (Fe, Ni)2P and liquid with 23 mol % P.
Determined the partition coefficient of phosphorus in the metal phase to be 0.14 ± 0.01 at 6 GPa and between 1050–1450°C.

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Experiments investigate phase relationships in the Fe–Ni–P system, revealing key melting points and compound behavior.

Vinogradova et al. (2026) studied this question.

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