THE SYSTEM MAGNESIUM OXIDE‐BORIC OXIDE*

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Abstract
Equilibrium In the system has been investigated for compositions from 0.6 to 75 weight per cent MgO. Three intermediate compounds are present. MgO⋅B2O3 melts incongruently at 988°C. to form 2MgO⋅B2O3 and a liquid containing more than 99% B2O3. The other two compounds melt congruently: 2MgO⋅B2O3 at 1340°C. and 3MgO⋅‐B2O3 at 1366°C. At 1142°C., a region of liquid immiscibility extends from 0.6 to 36.0% MgO. Temperatures are accurate within =5°C. Conflicts between these results and those of Toropov and Konovalov (see footnote 8) are discussed.

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