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DOI | 10.1073/pnas.2021810118 |
Fluid-like elastic response of superionic NH3 in Uranus and Neptune | |
Tomoaki Kimura; Motohiko Murakami | |
2021-04-06 | |
发表期刊 | Proceedings of the National Academy of Science
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出版年 | 2021 |
英文摘要 | Nondipolar magnetic fields exhibited at Uranus and Neptune may be derived from a unique geometry of their icy mantle with a thin convective layer on top of a stratified nonconvective layer. The presence of superionic H2O and NH3 has been thought as an explanation to stabilize such nonconvective regions. However, a lack of experimental data on the physical properties of those superionic phases has prevented the clarification of this matter. Here, our Brillouin measurements for NH3 show a two-stage reduction in longitudinal wave velocity (Vp) by ∼9% and ∼20% relative to the molecular solid in the temperature range of 1,500 K and 2,000 K above 47 GPa. While the first Vp reduction observed at the boundary to the superionic α phase was most likely due to the onset of the hydrogen diffusion, the further one was likely attributed to the transition to another superionic phase, denoted γ phase, exhibiting the higher diffusivity. The reduction rate of Vp in the superionic γ phase, comparable to that of the liquid, implies that this phase elastically behaves almost like a liquid. Our measurements show that superionic NH3 becomes convective and cannot contribute to the internal stratification. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/321041 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Tomoaki Kimura,Motohiko Murakami. Fluid-like elastic response of superionic NH3 in Uranus and Neptune[J]. Proceedings of the National Academy of Science,2021. |
APA | Tomoaki Kimura,&Motohiko Murakami.(2021).Fluid-like elastic response of superionic NH3 in Uranus and Neptune.Proceedings of the National Academy of Science. |
MLA | Tomoaki Kimura,et al."Fluid-like elastic response of superionic NH3 in Uranus and Neptune".Proceedings of the National Academy of Science (2021). |
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