Study of the melting transition at the interface of ice crystal using an ellipsometry

使用椭圆光度法研究冰晶界面的熔化转变

• 批准号: 01580050
• 负责人: FURUKAWA Yoshinori
• 金额: $ 0.51万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01580050/
• 关键词: Quasi-liquid layr; Surface melting; Grain boundary melting; Ellipsometry; Ice crystal; Grain boundary; 凝似液体層; 界面融解転移; 疑似液体層; 結晶粒界; 偏光解析

It is known that the crystal surface coverd with the quasi-liquid layr is more stable than the naked surface at temperatures just below the melting point. This phenomenon is a kind of first-order phase transition and specially called the surface me13EA\ : lting. On the other hand, the similar phenomena may occur at the interface between crystal and substrate or at the grain boundary of crystals. Though these phenomena have been studied theoretically and simulated by the morecular dynamics method and so on, any direct evidence by the experimental methods has not been reported. The purpose of this scientific research is to detect the melting transition at both the interface between ice crystal and glass substrate and at the grain boundary of ice13EA\ : crystals by the method of ellipsometry, and discuss the physical properties of the melting transition.The results are summarized as follows,1) The experimental method used in this research is an ellipsometry which is an optical method to m … More easure both the thickness and the optical constant of the thin layr at the interface. A new ellipsometer was constructed to measure the thickness and13EA\ : the refractive index of the transition layr at the ice-glass interface between. Total accuracy of the measurement is in 10A for the thickness and about 0.01 for the refractive index of transition layr.2) A transition layr was detected at the ice-glass interface in the temperature reagion above-1ﾟC.The thickness of the transition layr steeply increased with increasing temperature and the refractive index of the layr was vely close to the refra13EA\ : ctive index of bulk water. This result means that the transition layr at the ice-glass interface should be quasi-liquid layr and the melting transition can occur at the this interface.3) A new method of ellipsometry was developed to measure the thickness and the optical constant of the transition layr at the grain boundary of ice crystals. Used samples of ice crystals was prepared by a special method such as the ice by crystals was grown from the supercooled water using an artificial seed crystal.4) Using the new ellipsometer, we were able to observe the transition layr at the grain boundary.5) We discussed the physical properties of the melting transition of at the ice-glass interface and the grain boundary of ice crystals. This result will be published in the Journal of Crystal Growth in 1991. Less

在温度略低于熔点时，被准液体层覆盖的晶体表面比裸露的表面更稳定。这种现象是一种一阶相变，特别称为表面me13EA\: lting。另一方面，在晶体与基体的界面或晶体的晶界处也可能出现类似的现象。这些现象虽有理论研究和分子动力学等模拟方法，但尚未见实验方法的直接证据。本科学研究的目的是用椭圆偏振法检测冰晶与玻璃基板界面和冰晶晶界处的熔化转变，并讨论熔化转变的物理性质。结果总结如下：1)本研究采用的实验方法是椭圆偏振法，这是一种测量界面处薄层厚度和光学常数的光学方法。构造了一种新的椭偏仪来测量冰-玻璃界面过渡层的厚度和13ea \折射率。厚度测量的总精度在10A左右，过渡层折射率测量的总精度在0.01左右。2)在温度高于1ºC时，在冰-玻璃界面处发现了过渡层。随着温度的升高，过渡层的厚度急剧增加，其折射率非常接近体水的折射率。这意味着冰-玻璃界面处的过渡层应为准液体层，在该界面处可以发生熔融过渡。3)提出了一种测量冰晶晶界过渡层厚度和光学常数的椭偏测量新方法。使用过的冰晶样品是用一种特殊的方法制备的，如用人工晶体种子从过冷水中生长出冰晶。4)利用新的椭偏仪，我们能够观测到晶界处的过渡层。5)讨论了冰-玻璃界面和冰晶晶界处熔融转变的物理性质。这一结果将发表在1991年的《晶体生长杂志》上。少

项目成果

I.Ishikawa and Y.Furukawa: "Ellipsometric study of the transition layer at the interface between ice and glass" International Symposium on Physics and Chemistry of Ice. to be presented. (1991)

I.Ishikawa 和 Y.Furukawa：“冰与玻璃界面过渡层的椭圆测量研究”国际冰物理与化学研讨会。

Furukawa, Yoshinori: "Experimental study of the surface melting on an ice crystal" Abstracts of International Conference on Crystal Growth. 706. (1989)

Furukawa，Yoshinori：“冰晶表面熔化的实验研究”国际晶体生长会议摘要。

Y.Furukawa,M.Yamamoto and T.Kuroda: "Ellipsometric study of the Quasi-Liquid Layer at the surface of ice crystal" in,Morphology and Growth Unit of Crystals ed.I.Sunagawa,Terra Sci.Pub.647-650 (1989)

Y.Furukawa、M.Yamamoto 和 T.Kuroda：“冰晶表面准液体层的椭圆测量研究”，晶体形态和生长单元编辑 I.砂川，Terra Sci.Pub.647-650

Furukawa, Yoshinori: "Ellipsometric study of the transition layr at the interface between ice and glass" Journal of Crystal Growth. to be published.

Furukawa，Yoshinori：“冰与玻璃界面过渡层的椭圆测量研究”晶体生长杂志。

Y.Furukawa,A.Kouchi,M.Yamamoto and T.Kuroda: "Experimental study of the surface melting on an ice crystal" 第9回結晶成長国際会議(仙台). 706- (1989)

Y.Furukawa、A.Kouchi、M.Yamamoto 和 T.Kuroda：“冰晶表面熔化的实验研究”第 9 届国际晶体生长会议（仙台）706-（1989 年）。