| 【报告题目】Electron and Hydrogen as Anions in Oxides:Characterization and Utilization for Functional Materials 【报告人】 日本东京工业大学细野秀雄教授 【报告时间】2016年6月6日上午9:30-11:00 【报告地点】邵科馆报告厅 【邀请人】邱建荣教授 |  |
【 报告人简介】
细野秀雄教授现任日本东京工业大学元素战略材料研究中心主任。他是铁基超导材料的发明人，引领了超导研究领域的又一次变革。他长期致力于透明导体的研究，开发的ＩＧＺＯ材料已被ＳＨＡＲＰ、三星等公司用于平板显示。首次实现了让铝酸钙水泥变成了导体甚至是超导体。被誉为材料界的魔术师。
细野教授获得了诸多国际科技奖，包括麦克格雷迪新材料奖（James McGroddy Prize for New Materials），日本学士院奖以及今年的日本奖，被认为是最接近诺贝尔奖的科学家之一。由于铁基超导的发现，他在２０１３年获得汤姆孙－路透物理邻域引文桂冠（Thomson Reuter Citation Laureate）。
【报告摘要】
Electron and Hydrogen as Anions in Oxides:
Characterization and Utilization for Functional Materials
Hideo HOSONO
Materials Research Center for Element Strategy (MCES),
Tokyo Institute of Technology, Yokohama, JAPAN
It is a grand challenge in materials science to realize valuable active functionality using abundant elements. Electron and hydrogen are the most simple and abundant species in space. Most of functionalities in oxides are obtained by tuning cations. In this talk I introduce our approach to electro-active functionality in oxide-based materials focusing on electron and hydrogen as anions.
Crystals in which electrons serve as anions are called electride, which may be regarded as the crystalline form of solvated electrons. The first electride was synthesized by J.Dye1) in 1983 using crown-ether. The fatal drawback was extreme sensitivity to temperature and air. It was thus a long standing issue to realize RT-stable electride since then. We reported RT stable electride C12A7:e- in 2003 using 12CaO∙7Al2O3(C12A7).2) Since then, unique electronic structure3) and physical properties have been elucidated; insulator-metal-superconductor transition4) and very low work function (but chemical inertness) 5) are typical examples. In addition, metallic conduction at molten state is found.6) Recently, we reported two novel findings: Ru-loaded C12A7:e works as efficient ammonia synthesis 7) and 2-dimensinal electride Ca2N.8)
Another focus is hydrogen anion H- in oxides. We reported the incorporation of H- ions in C12A7 in place of O2- ions and found the UV-induced insulator – electronic conductor conversion. If O2- ion sites are replaced by H- ion, H- would work as an electron donor. This approach has succeeded in heavy electron doping to iron-based superconductor LaFeAsO1-xHx9) and two Tc-dome structure 10) has been found.
Ref 1) J.L.Dye et al. JACS 105, 6490(1983), 2)S.Matsuishi et al Science 301, 626(2003) 3) P.Sushko et al. PRL 91, 126401(2003), 4) H.Miyakawa et al. JACS 129,7270(2007), 5)Y.Toda et al. Adv.Mat. 19, 3564 (2007), 6)S.W.Kim et al. Science 333,.71 (2011), 7)K.Lee et al. Nature 494,336(2013), 8) M.Kitano et al. Nat.Chem. 4, 934 (2012), Nat.Comm. 6, 6731, (2015). 9) S.Iimura et al. Nat.Com. 3, 943(2012), 10) M.Hiraishi et al. Nat. Phys. 10, 300 (2014).
