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Roméite Solubility in the Fluid Immiscibility Region of the NaF–H2O System at 800°C, 200 MPa

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Abstract—

New data on roméite (CaNa)Sb2O6F solubility in the NaF–H2O system of P–Q type have been obtained within a wide range of sodium fluoride concentrations (from 0 to 25 wt % NaF). The concentration of antimony, in equilibrium with roméite and fluorite, in the range of NaF concentrations from 1 to 8 mol kg–1 H2O (25 wt % NaF), is in the range of 0.02–0.2 mol kg–1 H2O. According to the data, the concentration of antimony in phases L1 and L2 in the region of fluid immiscibility of the NaF–H2O system at 800°C, 200 MPa and fO2 = 50 Pa, specified by the Cu2O–CuO buffer, is 0.4 and 2.1 wt % Sb, respectively. Our experiments were the first ever to produce skeletal fluorite crystals and the intermetallic compound Pt5Sb, which belongs the hexagonal crystal system and has the following lattice parameters (LP): a = b = 4.56(4) Å, c = 4.229(2) Å, and α = β = 90°, γ = 120°. Pentaplatinum antimonide was formed on the inner surface of the Pt capsules at 800°C, Р = 200 MPa, and fO2 ≤ 10–3.47 Pa (Cu–Cu2O buffer) in experiments on the incongruent dissolution of roméite, which causes a sharp decrease (more than 1000 times) in antimony concentration in the solution.

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ACKNOWLEDGMENTS

The authors thank N.A. Drozhzhina (Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences) for XRD analyses of the solid experimental products, Dr. V.K. Karandashev (Institute of Problems of the Technologies of Microelectronics and Superpure Materials, Russian Academy of Sciences) and Dr. A.Yu. Bychkov (Faculty of Geology, Moscow State University) for ICP analyses of solutions after the experiments. We are thankful to the reviewers for discussion and valuable comments and to the scientific editor O.A. Lukanin and the editors of the journal for attention to this manuscript.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 20–05–00307a, and the Fundamental Research Program in the Russian Federation, project FMUF–2022-0003. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Korzhinskii Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. F. Redkin, N. P. Kotova, Yu. B. Shapovalov & A. N. Nekrasov

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  1. A. F. Redkin
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  2. N. P. Kotova
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  3. Yu. B. Shapovalov
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  4. A. N. Nekrasov
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Correspondence to A. F. Redkin.

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Translated by E. Kurdyukov

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Redkin, A.F., Kotova, N.P., Shapovalov, Y.B. et al. Roméite Solubility in the Fluid Immiscibility Region of the NaF–H2O System at 800°C, 200 MPa. Geochem. Int. 62, 384–392 (2024). https://doi.org/10.1134/S0016702923700155

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