可控纳米稀土镧、钆氢化物结构、相变与磁性能之间的机理研究

项目名称： 可控纳米稀土镧、钆氢化物结构、相变与磁性能之间的机理研究

项目编号： No.51201037

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 曾宏

作者单位： 钢铁研究总院

项目金额： 25万元

中文摘要： 稀土氢化物在储氢、光学窗口、氢传感器等方面有着广泛的应用前景。但迄今为止，有关纳米稀土氢化物的结构、相变与磁性研究未见报道。本项目采用新颖的制备技术，实现不同晶粒尺度纳米稀土氢化物可控制备，获得晶粒度在5-100nm纳米颗粒，确定合成工艺和材料结构之间的对应关系；深入研究材料的晶粒度对其晶体结构、显微组织特征及磁结构的影响；探明稀土氢化物在纳米化过程中的相变特征；建立纳米氢化物结构的氢原子占位模型；研究纳米化对氢化物相结构稳定性影响；建立纳米稀土氢化物微结构与其磁性能之间的构效关系模型,为研制具有纳米结构的新型稀土功能材料提供科学依据和理论指导。

中文关键词： 纳米；稀土；氢化物；相变；磁性

英文摘要： The rare-earth hydrides have attracted much attention in recent years due to their great potential applications, such as hydrogen storage, hydrogen sensor and optical windows. Up to now, reports on the microstructure,tranformation and magnetic properties of the nano rare-earth hydrides are still limited. In the present work, a novel method is developed for preparing the rare-earth metal hydride nanomaterials with different grain sizes, and the nanoparticles with the size of 5-100nm are synthesized. The relationship between the synthesis parameters and structure of nanomaterials is determined. The effect of the crystalline size on the crystal sturcture, microstructure and magentic structure is studied. The phase tranformations charactersitcs of the rare -earth hydrides during the nano process will be studied. The model of hydrogen occupition in the nano rare-earth hydrides will be built. The phase transformation characteristics of rare earth metal hydride nanomaterials will be explored at nano scale. The phase stability and evolution of nano process on the nano rare-earth hydrides will be studied. The relationship between magnetic properties and microstructures of the nano rare earth hydrides will be studied. Based on above studies, the scientific evidence and theoritical guide for the development of the

英文关键词： nano；rare-earth；hydrides；transformation；magentic properties