Phase diagrams showing the stability fields of solid molybdenum-bearing phases (a) and (b) in dry Cl 2 -gas, (c) H 2 O-dominated gas and (d) H–O–Cl–S-bearing gas. The red box in (c) represents the conditions of our experiments at 400 °C and the grey field in (d) the conditions for magmatic gases. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)  

Contexts in source publication

Context 1

... ambient conditions (25 °C, 1 bar) in dry Cl 2 -gas, the molybdenum oxy-chlorides are the stable solids for a wide range of Cl 2 and O 2 pressures (Fig. 10a). Increasing the temperature to 500 °C leads to a decrease in the stability fields of the molybdenum oxy-chlorides relative to those of the molybdenum oxides, and the appearance of MoCl 3,s as a stable phase (Fig. 10b). In H 2 O-dominated gas, for which HCl is the dominant chloride-bearing species, the stability fields of solid ...

Context 2

... (25 °C, 1 bar) in dry Cl 2 -gas, the molybdenum oxy-chlorides are the stable solids for a wide range of Cl 2 and O 2 pressures (Fig. 10a). Increasing the temperature to 500 °C leads to a decrease in the stability fields of the molybdenum oxy-chlorides relative to those of the molybdenum oxides, and the appearance of MoCl 3,s as a stable phase (Fig. 10b). In H 2 O-dominated gas, for which HCl is the dominant chloride-bearing species, the stability fields of solid oxy-chlorides and chlorides are fur- ther decreased in favour of those for the molybdenum oxi- des (Fig. 10c). The red box in Fig. 10c represents the conditions during the experiments at 400 °C, showing that solid molybdenum ...

Context 3

... of the molybdenum oxy-chlorides relative to those of the molybdenum oxides, and the appearance of MoCl 3,s as a stable phase (Fig. 10b). In H 2 O-dominated gas, for which HCl is the dominant chloride-bearing species, the stability fields of solid oxy-chlorides and chlorides are fur- ther decreased in favour of those for the molybdenum oxi- des (Fig. 10c). The red box in Fig. 10c represents the conditions during the experiments at 400 °C, showing that solid molybdenum oxy-chloride is thermodynamically unstable, consistent with the results of XRD-analyses of the experimental run products (Fig. 3). Figure 10d shows the stability fields of solids in equilibrium with an aqueous H 2 ...

Context 4

... relative to those of the molybdenum oxides, and the appearance of MoCl 3,s as a stable phase (Fig. 10b). In H 2 O-dominated gas, for which HCl is the dominant chloride-bearing species, the stability fields of solid oxy-chlorides and chlorides are fur- ther decreased in favour of those for the molybdenum oxi- des (Fig. 10c). The red box in Fig. 10c represents the conditions during the experiments at 400 °C, showing that solid molybdenum oxy-chloride is thermodynamically unstable, consistent with the results of XRD-analyses of the experimental run products (Fig. 3). Figure 10d shows the stability fields of solids in equilibrium with an aqueous H 2 S-HCl-bearing vapour at 400 °C, ...

Context 5

... red box in Fig. 10c represents the conditions during the experiments at 400 °C, showing that solid molybdenum oxy-chloride is thermodynamically unstable, consistent with the results of XRD-analyses of the experimental run products (Fig. 3). Figure 10d shows the stability fields of solids in equilibrium with an aqueous H 2 S-HCl-bearing vapour at 400 °C, reflecting conditions in a volcanic environment. Molybdenite (MoS 2 ) is the most common molybdenum-bearing mineral in nature and is Table 4 Values of the parameters for the linear equation, log K yÀ1,y = a + b * (1/t), that were used to make least squares fits to the logarithm of the cumulative equilibrium constant, log K yÀ1,y . ...