Evolution of electrical conductivity and semiconductor to metal transition of iron oxides at extreme conditions

作     者：Yukai Zhuang Qingyang Hu 庄毓凯;胡清扬

作者机构：Institute of Atomic and Molecular PhysicsSichuan UniversityChengdu 610065China Center for High Pressure Science and Technology Advanced Research(HPSTAR)Beijing 100094China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第8期

页      面：95-100页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42150101 and 42150102) supported by the CAEP Research Project(Grant No.CX20210048) a Tencent Xplorer Prize(Grant No.XPLORER-2020-1013) 

主　　题：high pressure metallization iron oxides electrical conductivity 

摘      要：Iron oxides are widely found as ores in Earth s crust and are also important constituents of its *** polymorphism,composition changes,and electronic structures play essential roles in controlling the structure and geodynamic properties of the solid *** all-natural occurring iron oxides are semiconductors or insulators at ambient pressure,they start to metalize under *** in this work,we review the electronic conductivity and metallization of iron oxides under high-pressure conditions found in Earth s lower *** summarize that the metallization of iron oxides is generally controlled by the pressure-induced bandgap closure near the Fermi *** metallization,they possess much higher electrical and thermal conductivity,which will facilitate the thermal convection,support a more stable and thicker D′′layer,and formulate Earth s magnetic field,all of which will constrain the large-scale dynamos of the mantle and core.