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arXiv 1702.03804cond-mat.mtrl-sci
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第一个高温高压合成的非二十面体硼同素异形体

First non-icosahedral boron allotrope synthesized at high pressure and high temperature

Irina Chuvashova, Elena Bykova, Maxim Bykov, Vitali Prakapenka, Konstantin Glazyrin, Mohamed Mezouar, Leonid Dubrovinsky, Natalia Dubrovinskaia

摘要:

由于现有实验条件的限制,压力诱导相变的理论预测往往成为长期存在的谜。非二十面体硼同素异形体的存在就是其中之一。本文报道了在金刚石对顶砧装置中,在极高压高温条件(115 GPa和2100 K)下合成的第一个具有正交α-Ga型结构(空间群Cmce)的非二十面体硼同素异形体,记为B-B。用单晶同步辐射X射线衍射方法研究了B_2O_3-B的结构,并在很高的压力范围内(115 GPa ~ 135 GPa)研究了它的压缩行为。理论预言的实验验证揭示了我们对凝聚态物质的最新认识程度,促进了固体物理和化学的进一步发展。

英文摘要:

Theoretical predictions of pressure-induced phase transformations often become long-standing enigmas because of limitations of contemporary available experimental possibilities. Hitherto the existence of a non-icosahedral boron allotrope has been one of them. Here we report on the first non-icosahedral boron allotrope, which we denoted as ζ-B, with the orthorhombic α-Ga-type structure (space group Cmce) synthesized in a diamond anvil cell at extreme high-pressure high-temperature conditions (115 GPa and 2100 K). The structure of ζ-B was solved using single-crystal synchrotron X-ray diffraction and its compressional behavior was studied in the range of very high pressures (115 GPa to 135 GPa). Experimental validation of theoretical predictions reveals the degree of our up-to-date comprehension of condensed matter and promotes further development of the solid state physics and chemistry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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