Abstract
The equilibrium vapor pressure of magnesium over the reaction between olivine (Mg2SiO4) and aluminum was measured by means of the transportation method in the temperature range 943–1150 °C.It was concluded that olivine and aluminum form an unstable system which reacts completely according to the equation[Formula: see text]However, in the presence of excess aluminum, an Al–Si alloy results. This alloy in turn reacts with magnesium oxide according to the equilibrium[Formula: see text]The vapor pressure of magnesium over this equilibrium system was found to obey the equation[Formula: see text]The aluminum activity of the Al–Si alloy along the liquidus line of the silicon side of the phase diagram has been calculated. Within the temperature range 943–1150 °C this activity can be represented by the equation[Formula: see text]
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