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VOLUME 78 (2003) | ISSUE 6 | PAGE 845
Structural transformations in liquid, crystalline and glassy B2O3 under high pressure
PACS: 61.20.-p, 61.43.-j, 62.50.+p, 64.70.-p
Abstract
We present in situ (X-ray diffraction) and ex situ (quenching) structural study of crystalline, liquid, and glassy B2O3 up to 9 GPa and 1700 K, drawing equilibrium and non-equilibrium phase diagrams of B2O3. Particularly, we have determined the melting curve, the stability regions for crystalline B2O3 I and B2O3 II modifications, the regions of transformations, such as densification or crystallization, for both the liquid and glassy states, including the region of sharp first-order-like transition in liquid B2O3 to a high-density phase nearby 7 GPa. Quenching experiments also show that the transition to the high-density liquid can occur at much lower pressures in non-stochiometric melt with excess of boron. B2O3 is the first glassformer, where transformations in the disordered state have been comparatively studied for both liquid and glassy phases.