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首页> 外文期刊>Physica status solidi, B. Basic research >Li2O at high pressures: structural properties, phase-transition, and phonons
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Li2O at high pressures: structural properties, phase-transition, and phonons

机译:高压下的Li2O:结构性质,相变和声子

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A structural phase transition in Li2O, from the anti-fluorite to the anti-cotumnite structure, is evidenced by angle-dispersive synchrotron X-ray powder diffraction and supported by ab initio calculations. The equations of state E(V), P(V) and the enthalpies H(P) are determined, for both phases, using total-energy calculations based on the Projector Augmented Waves method. The calculations supply the value of the transition pressure at T = 0 and in the 'ideal conditions' and provide detailed information on all 9 structural parameters describing the anti-cotunnite structure of Li2O at various pressures. We also report Raman frequencies, calculated for both phases and measured in the anti-fluorite phase, so as to provide a tool for monitoring the approach and the progress of the transformation. (c) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
机译:Li2O中的结构相变,从反萤石到反膨润土结构,通过角度色散同步加速器X射线粉末衍射得到证实,并由头算得到支持。使用基于投影增广波方法的总能量计算,确定了两个阶段的状态方程E(V),P(V)和焓H(P)。这些计算提供了T = 0和“理想条件”下的转变压力值,并提供了所有9个结构参数的详细信息,这些结构参数描述了Li2O在不同压力下的反共tun石结构。我们还报告了为两个相计算并在反萤石相中测量的拉曼频率,从而为监测转化方法和进展提供了一种工具。 (c)2005 WILEY-VCH Verlag GmbH&Co. KGaA,Weinheim。

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