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Structural transformations in liquid, crystalline, and glassy B$$_{2}$$O$$_{3}$$ under high pressure

高圧下での液体,結晶及びガラス状B$$_{2}$$O$$_{3}$$の構造変態

Brazhkin, V. V.*; 片山 芳則; 稲村 泰弘; Kondrin, M. V.*; Lyapin, A. G.*; Popova, S. V.*; Voloshin, R. N.*

Brazhkin, V. V.*; Katayama, Yoshinori; Inamura, Yasuhiro; Kondrin, M. V.*; Lyapin, A. G.*; Popova, S. V.*; Voloshin, R. N.*

結晶,液体,ガラス状B$$_{2}$$O$$_{3}$$のX線回折その場実験と回収実験による構造研究を9GPa, 1700Kまでの範囲で行い、平衡及び非平衡相図を得た。特に、融解曲線,結晶B$$_{2}$$O$$_{3}$$I及びB$$_{2}$$O$$_{3}$$IIの安定領域,液体B$$_{2}$$O$$_{3}$$において約7GPa付近で起きる高密度相への一次相転移的な急激な変化を含む液体やガラス状態の高密度化や結晶化など相変態が起きる領域を決定した。回収実験からは、ボロンの量が少ない非化学量論的な液体では、高密度液体への相変態が低い圧力で起きる可能性が示された。B$$_{2}$$O$$_{3}$$は、ガラス形成物質として、構造不規則系における構造変態が液体とガラスの両方の状態で初めて調べられた例となった。

We present in situ (X-ray diffraction) and ex situ (quenching) structural studies of crystalline, liquid, and glassy B$$_{2}$$O$$_{3}$$ up to 9 GPa and 1700 K, drawing equilibrium and nonequilibrium phase diagrams of B$$_{2}$$O$$_{3}$$, Particularly, we have determined the melting curve, the stability regions for crystalline B$$_{2}$$O$$_{3}$$ and B$$_{2}$$O$$_{3}$$ 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 B$$_{2}$$O$$_{3}$$ to a high-density phase near 7 GPa. Quenching experiments also show that the transition to the high-density liquid can occur at much lower pressures in nonstoichiometric melts with an excess of boron. B$$_{2}$$O$$_{3}$$ is the first glassformer whose transformations in the disordered state have been comparatively studied for both liquid and glassy phases.

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パーセンタイル:76.15

分野:Physics, Multidisciplinary

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