铈的高压相变与物性研究

项目名称： 铈的高压相变与物性研究

项目编号： No.U1330115

项目类型： 联合基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 崔啟良

作者单位： 吉林大学

项目金额： 86万元

中文摘要： 铈是一种典型的非放射性f电子过渡金属，由于它独特的电子结构以及凝聚态相的多态性，它一直是高压物理和强关联电子领域的热门研究对象。人们关注铈的另一个重要原因是它与重锕系元素的高压相变与压缩性质有很多相似之处，可以作为研究重锕系元素高压性质的理想模拟材料。目前，对铈的高压相变实验与理论研究已有相当多的报道，但在其高压相结构、相变序列、相变机制、相图和复杂的相界位置等研究方面还存在一些异议，超高压下的压缩性质研究还比较少。本项目以NSFS联合基金明确目标课题“铈的高压相变与物性研究”的研究任务为目标，利用成熟的原位高压同步辐射X射线衍射技术，进行80GPa以下铈的结构相变规律，以及不同的静水压条件对其高压物性参数的影响规律的研究；同时建立强氧化性材料高压相变研究的实验技术。该项目研究不仅能加深对铈的高压性质与高压行为的认知，也将为深入理解重锕系元素的高压相变与压缩性质提供重要的参考实验据数。

中文关键词： 铈；高压相变；状态方程；金刚石压砧；同步辐射X射线衍射

英文摘要： Cerium is a typical non-radioactive f-electron transition metal, being a research focus of high-pressure physics and strongly correlated electron fields due to its unique electronic structure and condensed matter phase polymorphism. In addition, Cerium is considered as a ideal module to study high pressure properties of heavy actinides because similarities of their high pressure phase transition and compressibility. There are numerous controversies about high pressure phase, phase transition route, phase transition mechanism, phase diagram, and phase boundary according to the experimental and theoretical reports. Furthermore, only a few studies about compressibility has been reported under ultra high pressure. This project focuses on the “High pressure phase transition and physical properties of cerium” of NSFS foundation using in situ synchrotron X-ray diffraction technique to study the phase transition under 80 GPa pressure and the effect of different hydrostatic conditions on high pressure physical parameters. Experimental techniques of study of strong oxidizing materials high pressure phase transition can be built. The project will not only deepen the awareness of the high-pressure nature of the high-pressure behavior of cerium, but also provide important experimental data to understand the high pressure pha

英文关键词： Cerium；High pressure phase transition；equation of state；diamond anvil cell；synchrotron X-ray diffraction