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《科学前沿报告会》 第397期

科学前沿报告会(397)

报告题目

High entropy oxides: a new class of functional materials

报 告 人

Professor Nita DRAGOE

Institute for Molecular Chemistry and Materials in Orsay, UMR 8182 CNRS, SP2M, University Paris Sud, University Paris-Saclay, 91405 Orsay, France

报告地点

物理楼 中211

报告时间

2017年11月14日 (星期二) 15:00-17:00

联 系 人

肖立新 (Tel: 6276 7290)

报告摘要

Since the early 2000s, an intense research activity is devoted to the study of high-entropy alloys, which have very interesting properties for many applications. These alloys are obtained by entropy stabilization of single phases from complex mixtures of typically 5 metals. Recently, this concept has been extended to oxides and it has been shown that the entropy stabilization of a solid solution from a mixture of MgO, NiO, CoO, CuO, and ZnO is possible. This structure is stabilized by the large configurational entropy arising from the site distribution of the five cations. Following this study, we have shown that the compounds of this new class of oxides may be substituted or co-substituted, which leads to a considerable number of possible chemical compositions. Furthermore, we studied the physical properties of some specific compounds which are extremely promising for applications such as colossal dielectric constant and super ionic conductivity. During this presentation, we will describe some new compositions belonging to this peculiar family and their outstanding transport properties.

 

报告人简介:2014- present, SP2M co-Director

2011-2014, LEMHE Director

2007- present, Habilitation committee chairman

2006-2014, PhD adviser committee chairman

2004-,Professor, ICMMO, University Paris Sud, Paris, France 

2001 – 2004, Associate Professor, Université Paris Sud, Orsay

2000 – 2001, Lecturer, Faculty of Engineering, University of Tokyo, Japan

 

 

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