Polymerization and diamond formation from melting methane and their implications in ice layer of giant planets
Polymerization and diamond formation from melting methane and their implications in ice layer of giant planets
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DOI：
10.1016/j.pepi.2008.06.011
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发表时间：
2009-05-01
影响因子：
2.3
通讯作者：
Yagi, Takehiko
中科院分区：
文献类型：
--
作者：
Hirai, Hisako;Konagai, Keisuke;Yagi, Takehiko
利用激光加热金刚石对顶砧装置对固体甲烷进行了高温高压实验。X-射线衍射和拉曼光谱显示，在10-80 GPa的宽压力范围内，熔融条件高于约1100 K。在1100 K以上，发生聚合以产生乙烷分子和进一步聚合的烃。在3000 K以上，产生了金刚石。这些变化取决于温度而不是压力。本研究为海王星和天王星等巨行星的中间冰层融化成富含甲烷的热海洋的理论预测提供了一些实验支持，并将有助于提高我们对巨行星内部化学过程的理解。(C)2008 Elsevier B. V.保留所有权利。
High-pressure and high-temperature experiments of solid methane were performed using a laser-heated diamond anvil cell. X-ray diffractometry and Raman spectroscopy revealed the melting conditions to be above approximately 1100 K in a wide pressure range of 10-80 GPa. Above 1100 K, polymerizations occurred to produce ethane molecules and further polymerized hydrocarbons. Above 3000 K, diamond was produced. These changes proceeded depending on temperature rather than on pressure. The present study provides some experimental supports to theoretical predictions that the middle ice layer of giant planets such as Neptune and Uranus melts into a hot methane-rich ocean, and will help to improve our understanding of the chemical process of the giant planets' interiors. (C) 2008 Elsevier B.V. All rights reserved.