项目名称: d-电子金属复合氧化物纳米材料的化学非整比及其调控
项目编号: No.21271171
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 李莉萍
作者单位: 中国科学院福建物质结构研究所
项目金额: 85万元
中文摘要: 化学非整比的调控是无机固体化学的核心内容之一,是无机固体实现磁电功能化的一个关键。为此,我们对晶格内部化学非整比进行了前期探索,实现了电学性能最佳化(AM1999;CM1999;CM2000;APL2002;CM2003);通过表面结构修饰,在AO和AO2等材料体系中实现了磁性转变或室温铁磁(APL2006,JACS2007)。最近我们在多组分ABO4纳米结构中初步实现了表面阳离子非整比(PCCP2011),但也发现表面非整比选择性调控难、表面和晶格内部化学非整比协同难、和特定磁电性能实现难等问题。为此,我们拟结合在电子转移控制方面的工作基础(APL2005,APL2006,CM2006,CC2008,JMC2010),开展d-电子金属纳米氧化物ABO4的化学非整比的系统研究,通过对d-电子金属离子竞争性占位、电荷补偿机制和表面缺陷电子态规律本质的揭示,获得优异磁电性能的新材料和新方法。
中文关键词: 非计量比;纳米氧化物;化学合成;介电增强;热力学数据
英文摘要: Chemical non-stoichiometry belongs to one of the important themes for inorganic chemistry, which plays the key roles in achieving electro-magnetic functionalities of almost all inorganic compounds. In this direction, we made some preliminary investigations on the nonstoichiometries within the lattice, from which electrical performance was achieved (AM1999;CM1999;CM2000;APL2002;CM2003). Furthermore, we accomplished magnetic transitions or room-temperature ferromagnetism through surface structural modifications(APL2006,JACS2007). Recently, we made some further steps in realizing cationic nonstoichiometry in multicomponent ABO4 nanostructure(PCCP2011), but we also found that it is very difficult to selectively control the surface cationic nonostroichiometry essential for synergy between surface and lattice nonstoichiometries in producing electro-magnetic functionalities.On the basis of our previous work on electronic transfer of nanosolids(APL2005, APL2006, CM2006, CC2008,JMC2010), in this project, we will start to investigate the chemical nonstoichiometries in multicomponent metal oxide nanomaterials that contain d-metals. Through uncovering the competitive site occupations and charge compensation mechanism as well as the defective electronic states, we expect to find new approaches in producing excellent electro-
英文关键词: non-stoichiometry;nano-oxide;chemical synthesis;dielectric enhancement;thermodynamic data