• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Relationship between melting and amorphization of ice
【24h】

Relationship between melting and amorphization of ice

机译：冰融化与非晶化的关系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

THE discovery in 1984 that aa ice crystal can be transformed by pressure to an amorphous phase has since been followed by other examples of pressure-induced amorphization. This transition, like melting, involves loss of long-ranged order, prompting the question of whether the two transitions are related. Here I describe experiments probing this relationship for a form of crystalline ice (denoted Ih) which is melted and amorphized by pressure. To avoid the complication of crystal-crystal transformations interrupting the melting process I use an ice emulsion, in which the very small particle size (about Sum) suppresses nucleation of other crystal phases. As the temperature is decreased, I see a smooth crossover from (pressure-induced) equilibrium melting to sluggish amorphization at around 140-165K. In this temperature range, ice Ih became 'supercompressed' before melting to a highly viscous liquid which seemed to be related to an imperfectly relaxed amorphous ice. Below about 140K, ice Ih was transformed to an unrelaxed phase apparently related to the high-density amorphous form of ice. This sequence of transitions can be viewed as a crossover from a two-phase melting process (which is determined by the relative free energies of the solid and liquid phases) towards a one-phase amorphization process, (where the transition is induced by a mechanical instability limit of the solid).
机译：自1984年发现冰晶可以通过压力转变为非晶相以来，随后又出现了压力诱导非晶化的其他例子。像融化一样，这种转变涉及失去长程有序性，这引发了两个转变是否相关的问题。在这里，我描述了一些实验，探讨了这种关系对于某种形式的结晶冰（表示为Ih）的情况，该结晶通过压力融化并非晶化。为了避免晶体-晶体转变的复杂性打断熔化过程，我使用了一种冰乳液，其中很小的粒径（约Sum）抑制了其他晶体相的形核。随着温度降低，我看到在140-165K左右从（压力引起的）平衡熔化到缓慢的非晶化有一个平稳的过渡。在此温度范围内，冰Ih在融化为高粘性液体之前变得“超压缩”，这似乎与不完全松弛的无定形冰有关。低于约140K，冰Ih转变为显然与高密度非晶态冰有关的非松弛相。这种转变顺序可以看作是从两相熔融过程（由固相和液相的相对自由能确定）到一相非晶化过程（其中的转变是由机械引起的）的过渡。固体的不稳定性极限）。

著录项

  • 来源
    《Nature》 |1996年第6609期|p.546-549|共4页
  • 作者

    Osamu Mishima;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号