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THE SYSTEM MAGNESIUM OXIDE-BORIC OXIDE* |
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| Authors: | H M Davis M A Knight |
| Affiliation: | 1. School of Mineral Industries The Pensylvania State College State College, Pennsylvania
Assistant Professor of Metallurgy, The Pennsylvania State College, State College, Pa.;2. School of Mineral Industries The Pensylvania State College State College, Pennsylvania Research Associate, Preston Laboratories, Butler, Pa., formerly Graduate Fellow, Department of Ceramics, The Pennsylvania State College, State College, Pa. |
| 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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