Thermodynamic Analysis of NixFe1 – x Alloy Oxidation

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geochemistry International Pub Date : 2025-04-14 DOI:10.1134/S0016702924601621

V. N. Devyatova, A. G. Simakin, A. N. Nekrasov

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Abstract

This paper reports the thermodynamic analysis of Ni_xFe_1-x oxidation for awaruite, Ni₃Fe, which is widespread in serpentinized ultrabasic rocks, and other Ni–Fe phases over a wide range of temperatures (400–1873 K) and crustal pressures up to 2 kbar. It was found that the equilibrium γ(Ni_xFe_{1 –} _x)–Fe oxides constrains oxygen fugacity (fO₂) at the NNO–IW range. For γ(Ni_xFe_{1 –} _x) with an iron mole fraction x ≥ 0.5, fO₂ approaches the IW buffer. The reaction of kamacite, α(Ni_0.05Fe_0.95), with oxygen is close to the IW–IM buffer reactions. The fO₂ values of awaruite preservation are no higher than ∆QFM = –(7.8–5.2) at T = 400–600 K and increase to ∆QFM = –(2.7–2.0) at T > 1000–1200 K. The obtained approximations of the temperature dependence of fO₂ can be used to estimate the redox conditions in low-sulfide systems containing Ni_xFe_{1 –} _x under the conditions of the Earth’s crust.

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NixFe1 - x 合金氧化的热力学分析

本文报道了在400 ~ 1873 K的温度范围和2 kbar的地壳压力下，镍铁（NixFe1-x）氧化镁、广泛存在于蛇纹岩超基性岩中的Ni3Fe和其他Ni-Fe相的热力学分析。在NNO-IW范围内，平衡态γ(NixFe1 - x) - fe氧化物抑制了氧逸度（fO2）。对于铁摩尔分数x≥0.5的γ(NixFe1 - x)， fO2接近IW缓冲液。α(Ni0.05Fe0.95)与氧的反应近似于IW-IM缓冲反应。在T = 400-600 K时，白蜡保存的fO2值不高于∆QFM = -(7.8-5.2)，在T >时增加到∆QFM = - (2.7-2.0)；1000 - 1200 K。所得的fO2的温度依赖性近似可以用来估计含NixFe1 - x的低硫化物体系在地壳条件下的氧化还原条件。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geochemistry International 地学-地球化学与地球物理

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

1 months

期刊介绍： Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.