报告题目：Possible presence of noble gas and itscompounds at the Earth’s core

报告人：Dr. Yansun Yao （University of Saskatchewan, Canada）

时间：2019年10月25日（周五）下午2:30

地点：前卫南区唐敖庆楼C区603报告厅

报告摘要：Various geophysicalmodels have shown that noble gases such as Xe and Ar are depleted in Earth’smain reservoirs (i.e., continental crust, atmosphere, and silicate mantle).This indicates that a large amount of noble gas may be present in the Earth’score but such consideration is hindered by the lack of knowledge on thereactability of noble gas elements with the core’s main constituents (Ni andFe). Here we demonstrate, using density functional calculations and in situ synchrotronx-ray diffraction, that stable compounds can form between Xe/Ar and Ni/Fe atthermodynamic conditions representative of the Earth’s core. Such compounds arestabilized by notable electron transfer from metals to noble gas elements,changing the electron configurations of the latter toward s-metal. The presentresults suggest that the abundance of noble gas in the Earth’s core is beyond asimple solubility of noble gas in molten Ni-Fe but a chemical reaction innature, which is truly extraordinary considering the inert nature of noblegases at ambient conditions.

报告人简介：

Yansun Yao, Ph. D.

Associate Professor

Department of Physics and Engineering Physics

University of Saskatchewan

Email:yansun.yao@usask.ca

Education

2003-2008 Ph. D., CondensedMatter Physics, University of Saskatchewan, Canada

2000-2003 M. Sc., CondensedMatter Physics, Beijing Institute of Technology, China

1996-2000 B. Sc., AppliedPhysics, Beijing Institute of Technology, China

Working Experience

2012 – Assistant, AssociateProfessor, Department of Physics and Engineering Physics, University ofSaskatchewan, Canada

2012 – Research Scientist,Canadian Light Source, Canada

2009 – 2012Assistant ResearchOfficer,National Research Council of Canada

2008 – 2009Research Associate,National Research Council of Canada

举办单位：超硬材料国家重点实验室

物理学院

尊龙凯时省物理学会

中国物理学会高压物理专业委员会