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

Redkin, A.F.; Kotova, N.P.; Shapovalov, Y.B.; Nekrasov, A.N.

Авторы: Redkin A.F., Kotova N.P., Shapovalov Yu B., Nekrasov A.N.
Журнал: Geochemistry International
Том: 62
Номер: 4
Год издания: 2024
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 384
Последняя страница: 392
DOI: 10.1134/S0016702923700155
Аннотация: New data on romeite (CaNa)Sb2O6F solubility in the NaF– H2O system of P–Q type have beenobtained within a wide range of sodium fluoride concentrations (from 0 to 25 wt % NaF). The concentration of antimony, in equilibrium with romeite 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 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) Е, c = 4.229(2) Е, 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 (Cu2O- CuO buffer) in experiments on the incongruent dissolution of romeite, which causes a sharp decrease (more than 1000 times) in antimony concentration in the solution.
Добавил в систему: Котова Наталья Петровна

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Romeite Solubility in the Fluid Immiscibility Region of the NaF–H2O System at 800°C, 200 MPaстатья Исследовательская статья