Phase equilibria in the system MgO-B203 were investigated using DTA and quenching techniques. The system contains 4 invariant points. The compounds MgO. 2 B 2 0 3 and 2Mg0. B z 0 3 melt incongruently at 995" and 1312"C, respectively, whereas 3 M g 0 . B,O, melts congruently at 1410°C. A eutectic occurs at 1333°C and 71% MgO.
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