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Formation of ammonia-helium compounds at high pressure

文献类型：期刊论文

作者Shi, Jingming2; Cui, Wenwen2; Hao, Jian2,3; Xu, Meiling2; Wang, Xianlong1; Li, Yinwei2
刊名NATURE COMMUNICATIONS
出版日期2020-06-22
卷号11
ISSN号2041-1723
DOI10.1038/s41467-020-16835-z
通讯作者Wang, Xianlong(xlwang@theory.issp.ac.cn) ; Li, Yinwei(yinwei_li@jsnu.edu.cn)
英文摘要Uranus and Neptune are generally assumed to have helium only in their gaseous atmospheres. Here, we report the possibility of helium being fixed in the upper mantles of these planets in the form of NH3-He compounds. Structure predictions reveal two energetically stable NH3-He compounds with stoichiometries (NH3)(2) He and NH3 He at high pressures. At low temperatures, (NH3)(2) He is ionic with NH3 molecules partially dissociating into (NH2)(-) and (NH4)(+) ions. Simulations show that (NH3)(2) He transforms into intermediate phase at 100GPa and 1000K with H atoms slightly vibrate around N atoms, and then to a superionic phase at similar to 2000K with H and He exhibiting liquid behavior within the fixed N sublattice. Finally, (NH3)(2) He becomes a fluid phase at temperatures of 3000 K. The stability of (NH3)(2) He at high pressure and temperature could contribute to update models of the interiors of Uranus and Neptune.
WOS关键词X-RAY-DIFFRACTION ; WATER ; INTERIORS ; CRYSTAL ; EVOLUTION ; URANUS ; STATES ; PHASE
资助项目NSFC[11804129] ; NSFC[11722433] ; NSFC[11804128] ; NSFC[11904142] ; NSFC[11674329] ; Six Talent Peaks Project of Jiangsu Province ; Science Challenge[TZ2016001]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000544742300011
出版者NATURE PUBLISHING GROUP
资助机构NSFC ; Six Talent Peaks Project of Jiangsu Province ; Science Challenge
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/71134]  
专题中国科学院合肥物质科学研究院
通讯作者Wang, Xianlong; Li, Yinwei
作者单位1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
2.Jiangsu Normal Univ, Sch Phys & Elect Engn, Lab Quantum Mat Design & Applicat, Xuzhou 221116, Jiangsu, Peoples R China
3.Jiangsu Normal Univ, Jiangsu Key Lab Adv Laser Mat & Devices, Xuzhou 221116, Jiangsu, Peoples R China
推荐引用方式
GB/T 7714		 Shi, Jingming,Cui, Wenwen,Hao, Jian,et al. Formation of ammonia-helium compounds at high pressure[J]. NATURE COMMUNICATIONS,2020,11.
APA Shi, Jingming,Cui, Wenwen,Hao, Jian,Xu, Meiling,Wang, Xianlong,&Li, Yinwei.(2020).Formation of ammonia-helium compounds at high pressure.NATURE COMMUNICATIONS,11.
MLA Shi, Jingming,et al."Formation of ammonia-helium compounds at high pressure".NATURE COMMUNICATIONS 11(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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