Interaction of platinum with antimony-bearing compounds in NaF fluids at 800 °C and 200 MPA

IF 1.2 4区地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2024-10-28 DOI:10.1007/s00269-024-01299-0

Alexander F. Redkin, Andrey M. Ionov, Alexey N. Nekrasov, Andrey D. Podobrazhnykh, Rais N. Mozhchil

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Abstract

Studies conducted in NaF-containing hydrothermal fluids have shown that the oxide compounds Sb⁵⁺ are unstable at 800 °C, Р_total = 200 MPa and fO₂ (fH₂) specified by Co–CoO and Ni–NiO buffers interact with the Pt material of the ampoule, forming antimony intermetallics with platinum on the inner surface of the ampoule. The formation of the following intermetallics was established through the analysis of data obtained from studies conducted on an electronic microscope: Pt_90.3±0.8Sb_9.7 (~ Pt₁₀Sb), Pt_82.8±1.3Sb_17.2 (~ Pt₅Sb) and Pt_69.2±4.4Sb_30.8. Pt₁₀Sb compound which was obtained on the inner surface of the Pt ampoule is the limiting solid solution of antimony in platinum at 800 °C. It exhibits a cubic crystal system \(Fm\overline{3}m\) with a lattice constant of a = 3.943(3) Å and forms an underdeveloped surface < 111>. Pt₅Sb compound, presumably hexagonal P6/mmm crystal system with unit cell parameters a = b = 4.56(4), c = 4.229(2) Å, α = β = 90°, γ = 120°, forms a thin film (≤ 10 μm) on the Pt surface and appears to be a metastable phase. The intermetallic compound of Pt₆₉Sb₃₁ is a rapidly cooled melt of appropriate composition.

A mechanism for deep penetration of Sb into the walls of the Pt ampoule is proposed.

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800 °C 和 200 MPA 下 NaF 流体中铂与含锑化合物的相互作用

在含 NaF 的热液中进行的研究表明，氧化物 Sb5+ 在 800 ℃、Рtotal = 200 MPa 和 Co-CoO 和 Ni-NiO 缓冲剂规定的 fO2（fH2）条件下不稳定，会与安瓿的铂材料相互作用，在安瓿内表面与铂形成锑金属间化合物。通过分析电子显微镜研究获得的数据，确定形成了以下金属间化合物：Pt90.3±0.8Sb9.7（~ Pt10Sb）、Pt82.8±1.3Sb17.2（~ Pt5Sb）和 Pt69.2±4.4Sb30.8。在铂安瓿内表面获得的 Pt10Sb 化合物是铂中锑在 800 °C 时的极限固溶体。它呈现出晶格常数为 a = 3.943(3) Å 的立方晶系（Fm/overline{3}m/），并形成一个不发达的表面 <111>。Pt5Sb 化合物推测为六方 P6/mmm 晶系，单胞参数 a = b = 4.56(4)，c = 4.229(2)埃，α = β = 90°，γ = 120°，在铂表面形成一层薄膜（≤ 10 μm），似乎是一种可转移相。Pt69Sb31 金属间化合物是一种具有适当成分的快速冷却熔体。

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来源期刊

Physics and Chemistry of Minerals 地学-材料科学：综合

CiteScore

2.90

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)