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Report No.

Structural transformations and anomalous viscosity in the B$$_{2}$$O$$_{3}$$ melt under high pressure

Brazhkin, V. V.*; Farnan, I.*; Funakoshi, Kenichi*; Kanzaki, Masami*; Katayama, Yoshinori; Lyapin, A. G.*; Saito, Hiroyuki

Liquid B$$_{2}$$O$$_{3}$$ represents an archetypical oxide melt with the cation coordination number 3 and unusual structural units - planar boroxol rings. It features super-high viscosity at melting temperature. The results of the ${it in-situ}$ X-ray diffraction study and ${it in-situ}$ viscosity measurements of the B$$_{2}$$O$$_{3}$$ liquid under high pressure up to 8 GPa are presented. Additionally, the NMR study of B$$_{2}$$O$$_{3}$$ glasses quenched from the melt at different pressures has been carried out. The number of the boroxol rings in the melt rapidly decreases with pressure. The viscosity of the B$$_{2}$$O$$_{3}$$ melt along the melting curve drops by 4 orders of magnitude as the pressure increases up to 5.5 GPa and remains unchanged on further pressure increase.



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Category:Physics, Multidisciplinary



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