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Mechanisms of anomalous compressibility of vitreous silica

机译：石英玻璃可压缩性异常的机理

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摘要

The anomalous compressibility of vitreous silica has been known for nearly a century, but the mechanisms responsible for it remain poorly understood. Using GHz-ultrasonic interferometry, we measured longitudinal and transverse acoustic wave travel times at pressures up to 5 GPa in vitreous silica with fictive temperatures (T_f) ranging between 985 ℃ and 1500 ℃. The maximum in ultrasonic wave travel times-corresponding to a minimum in acoustic velocities-shifts to higher pressure with increasing T_f for both acoustic waves, with complete reversibility below 5 GPa. These relationships reflect polyamorphism in the supercooled liquid, which results in a glassy state possessing different proportions of domains of high- and low-density amorphous phases (HDA and LDA, respectively). The relative proportion of HDA and LDA is set at T_f and remains fixed on compression below the permanent densification pressure. The bulk material exhibits compression behavior systematically dependent on synthesis conditions that arise from the presence of floppy modes in a mixture of HDA and LDA domains.
机译：石英玻璃的异常可压缩性已经有近一个世纪了，但是引起这种现象的机理仍知之甚少。使用GHz超声干涉法，我们测量了玻璃石英中压力最高为5 GPa时纵向和横向声波的传播时间，虚拟温度（T_f）在985℃至1500℃之间。超声波传播时间的最大值（对应于声速的最小值）随两种声波的T_f的增加而移至更高的压力，且完全可逆性低于5 GPa。这些关系反映了过冷液体中的多晶现象，这导致玻璃态具有不同比例的高密度和低密度非晶相（分别为HDA和LDA）。 HDA和LDA的相对比例设置为T_f，并在低于永久致密化压力的压缩条件下保持固定。块状材料表现出的压缩行为系统地取决于合成条件，该合成条件是由HDA和LDA域混合存在软盘模式引起的。

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  • 来源
    《Physical review》 |2014年第17期|174110.1-174110.6|共6页
  • 作者

    Alisha N. Clark; Charles E. Lesher; Steven D. Jacobsen; Sabyasachi Sen;

  • 作者单位

    Department of Earth and Planetary Sciences, University of California, Davis, California 95616, USA;

    Department of Earth and Planetary Sciences, University of California, Davis, California 95616, USA,Department of Geoscience, Aarhus University, DK-8000 Aarhus C, Denmark;

    Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Materials Science, University of California, Davis, California 95616, USA;

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  • 正文语种 eng
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  • 关键词

    studies of specific liquid structures; glasses;

    机译：研究特定的液体结构;眼镜;

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