ABSTRACT We present experimental results on melting and subsolidus phase relations in the Ni–Ni2P system at 6 GPa and 900–1600°C. The system has four stable phosphides: Ni3P nickelphosphide, Ni8P3/Ni5P2, Ni12P5 and Ni2P transjordanite. The Ni12P5 phase becomes unstable at 900°C and decomposes into Ni5P2 and Ni2P. The eutectic Ni–Ni3P locates at 950°C and 20 mol% P. Ni3P melts incongruently at 1075°C to Ni5P2 and liquid containing 23 mol% P. Ni8P3 and Ni5P2 form a homogeneity range with crystal structure close to Ni5P2. The Ni5P2–Ni2P eutectic locates at 1175°C and 29 mol%. Ni2P melts congruently at 1250°C. The quenched products of nickelphosphide liquid correspond to the eutectics composition and can serve as indicators for reconstructing the P–T–X conditions recorded in meteoritic and terrestrial Fe–Ni–P assemblages. The Ni–P stoichiometries, which were not observed in the equilibrium phase diagrams, including Ni4P and Ni5P, remain enigmatic.

中文翻译：

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6 GPa 下的 Ni-Ni2P 相图对陨石和超还原地球岩石的影响

摘要 我们展示了在 6 GPa 和 900-1600°C 条件下 Ni-Ni2P 系统中熔化和亚固相相关系的实验结果。该体系有四种稳定的磷化物：Ni3P 磷化镍、Ni8P3/Ni5P2、Ni12P5 和 Ni2P 氧化镁。Ni12P5 相在 900°C 时变得不稳定并分解为 Ni5P2 和 Ni2P。共晶 Ni-Ni3P 位于 950°C 和 20 mol% P。Ni3P 在 1075°C 不协调地熔化成 Ni5P2 和含有 23 mol% P 的液体。Ni8P3 和 Ni5P2 形成一个具有接近 Ni5P2 晶体结构的均质范围。Ni5P2–Ni2P 共晶位于 1175°C 和 29 mol%。Ni2P 在 1250°C 时完全熔化。磷化镍液体的淬火产物对应于共晶成分，可作为重建陨石和地球 Fe-Ni-P 组合中记录的 P-T-X 条件的指标。Ni-P 化学计量，