Thermodynamically Consistent p−T Phase Diagram of Boron OxideB2O3 by in Situ Probing and Thermodynamic Analysis

International audienceAlthough boron oxide B2O3 is an archetypical glass-forming substance oflarge industrial and fundamental importance, its phase diagram remains controversial. Inthe present work, the p−T phase diagram of B2O3 has been constructed based on in situexperimental data up to 8 GPa and 1900 K and thermodynamic analysis. In contrast tothe previous studies, the proposed phase diagram represents only thermodynamicequilibria (reversible transformations in experiments) between crystalline (α, β) andliquid states, not influenced by kinetic phenomena