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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Water: an elusive component of silicate melts
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Water: an elusive component of silicate melts

机译：水：硅酸盐熔体的一种难以捉摸的成分

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摘要

In spite of their fundamental importance in geophysics, the strong effects of water on the physical properties of silicate glasses and melts have long remained poorly understood because of the difficulties of making measurements at the kbar pressures under which water solubility is significant. Due to the slowness of water exsolution close to the glass transition, it is in fact possible to perform accurate measurements on water-hearing liquids supercooled at room pressure. Only hydration has, then, to be performed at high pressure. The purpose of this review is to summarise the wealth of information gathered during the past decade with this new procedure. Much effort has been devoted to viscosity, a property for which the depressing effects of water clearly increases with the degree of polymerisation of the melt. Consistent with the Adam-Gibbs theory of relaxation processes, these effects correlate with the magnitude of configurational heat capacity. In contrast with this strong influence, the enthalpy of mixing between water and silicic aluminosilicate melts is almost ideal. As for volume properties, water exerts a moderate influence on thermal expansion whereas its effect on compressibility strongly depends on silicate composition.
机译：尽管水对硅酸盐玻璃和熔体的物理性能的强烈影响尽管在地球物理学中具有根本的重要性，但由于在难溶于水的kbar压力下进行测量的困难，长期以来人们对它的强烈影响仍然知之甚少。由于接近玻璃化转变的放水速度很慢，因此实际上可以对在室温下过冷的含水液体进行精确的测量。因此，仅需在高压下进行水合。这篇综述的目的是总结在过去十年中通过这种新程序收集到的大量信息。对于粘度，已经进行了很多努力，对于该性质，水的降低效果随着熔体的聚合程度而明显增加。与Adam-Gibbs松弛过程理论一致，这些影响与结构热容的大小相关。与这种强烈的影响相反，水和硅铝硅酸盐熔体之间的混合焓几乎是理想的。至于体积特性，水对热膨胀有中等影响，而水对可压缩性的影响则主要取决于硅酸盐的组成。

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