Equilibrium p-T phase diagram of boron: experimental study and thermodynamic analysis.

Equilibrium p-T phase diagram of boron: experimental study and thermodynamic analysis.
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DOI:
10.1038/srep02351
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Kurakevych, Oleksandr O.
Kurakevych, Oleksandr O.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Solozhenko, Vladimir L.;Kurakevych, Oleksandr O.

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在 1500–2500 K 温度范围内,在 20 GPa 的压力下,扩散过程变得快速并导致热力学稳定相的形成,对高纯晶体硼的固态相变和熔化进行了原位和异位研究。根据实验和文献数据的热力学分析构建了硼的平衡相图。图中的高温部分包含菱面体 β-B106、斜方晶系 γ-B28、伪立方晶系(四方晶系)t'-B52 和液态硼 (L) 的热力学稳定性 p-T 域。两个三相点的位置已通过实验估计,即 β-t'-L 在约 8.0 GPa 和约 2490 K 处;和 β–γ–t' 在 ~ 9.6 GPa 和 ~ 2230 K。最后,所提出的相图解释了硼同素异形性的所有热力学方面,并显着提高了我们对第五种元素的理解。
Solid-state phase transformations and melting of high-purity crystalline boron have been in situ and ex situ studied at pressures to 20 GPa in the 1500–2500 K temperature range where diffusion processes become fast and lead to formation of thermodynamically stable phases. The equilibrium phase diagram of boron has been constructed based on thermodynamic analysis of experimental and literature data. The high-temperature part of the diagram contains p-T domains of thermodynamic stability of rhombohedral β-B106, orthorhombic γ-B28, pseudo-cubic (tetragonal) t'-B52, and liquid boron (L). The positions of two triple points have been experimentally estimated, i.e. β–t'–L at ~ 8.0 GPa and ~ 2490 K; and β–γ–t' at ~ 9.6 GPa and ~ 2230 K. Finally, the proposed phase diagram explains all thermodynamic aspects of boron allotropy and significantly improves our understanding of the fifth element.
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