Roméite Solubility in the Fluid Immiscibility Region of the NaF–H2O System at 800°C, 200 MPa.
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| Title: | Roméite Solubility in the Fluid Immiscibility Region of the NaF–H |
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| Authors: | Redkin, A. F.1 (AUTHOR) redkin@iem.ac.ru, Kotova, N. P.1 (AUTHOR), Shapovalov, Yu. B.1 (AUTHOR), Nekrasov, A. N.1 (AUTHOR) |
| Source: | Geochemistry International. Apr2024, Vol. 62 Issue 4, p384-392. 9p. |
| Subjects: | Hexagonal crystal system, Immiscibility, Antimony, Intermetallic compounds, Platinum, Solubility, Lattice constants |
| 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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00167029 |
| DOI: | 10.1134/S0016702923700155 |
