Precise Structure Analyses of Perovskite-type Mixed Conductors

在本研究中，我们的目的是1）开发燃料电池操作条件下的中子衍射法和核密度水平的晶体结构评估方法，以及2）阐明核（或电子）密度水平的晶体结构与钙钛矿型混合导体的导电性能之间的关系。在2005年度，合成了（La，Sr）MnO_3系钙钛矿型化合物，进行了X射线吸收精细结构（XAFS）测定（产业技术综合研究所（AIST））、X射线衍射测定（AIST）、高温中子衍射测定（原子能机构（JAEA）的东海研究开发中心）。此外，还设计并制作了用于高温中子衍射测量的样品加热装置，并进行了试运行。在2006年度，（La，Sr）CoO_3基钙钛矿型化合物 ...更多信息 合成的，并进行了以下测量：原位同步XAFS测量（在Spring-8），原位X射线衍射测量（在AIST），和原位中子衍射测量使用的加热装置在这个项目中开发的（在东海R&D中心，JAEA）。根据测量数据的分析结果，我们发现在核的晶体结构之间有密切的关系，（或电子）密度水平和导电性能（氧化物离子和空穴电导率）的钙钛矿型混合导体。在未来，我们计划在-利用本计画所发展之新样品加热装置，对不同种类之燃料电池相关材料进行中子绕射量测。对于所获得的衍射数据，我们将在核密度水平上进行结构分析，并系统地阐明其与电导率的关系。我们还计划在AIST研究信息数据库（RIO-DB）的网站“电化学器件固态导体数据库（SSCED）”（URL http：//riodbdev.ibase.aist.go.jp/ssced/en/index.html）上公开研究结果。少

In this study, we aimed at 1) developing a neutron diffractometry under fuel cell operating conditions and a crystal structure evaluation method at a nuclear density level, and 2) elucidating the relationship between the crystal structure at a nuclear (or an electron) density level and the electrical conduction properties of perovskite-type mixed conductors. In fiscal 2005, (La,Sr)MnO_3-based perovskite-type compounds were synthesized and the following measurements were carried out: an X-ray absorption fine structure (XAFS) measurement (at National Institute of Advanced Industrial Science and Technology (AIST)), an X-ray diffraction measurement (at AIST), a high-temperature neutron diffraction measurement (at Tokai R&D center, Japan Atomic Energy Agency (JAEA)). In addition, a sample heating apparatus for high temperature neutron diffraction measurements has been designed and fabricated, and then a test run was carried out. In fiscal 2006, (La,Sr)CoO_3-based perovskite-type compounds w … More ere synthesized and the following measurements were carried out: in-situ synchrotron XAFS measurement (at Spring-8), in-situ X-ray diffraction measurement (at AIST), and in-situ neutron diffraction measurement using the heating apparatus developed in this project (at Tokai R&D center, JAEA). On the basis of analysis results of the measured data, we found close relationships between the crystal structures at nuclear (or electron) density level and the electrical conduction properties (oxide-ion and hole conductivities) of perovskite-type mixed conductors.In the future, we are planning to conduct in-situ neutron diffraction measurements using the new sample heating apparatus developed in this project for different kinds of fuel cell related materials. For the diffraction data obtained, we will make structure analyses at a nuclear density level, and elucidate its relationships with electrical conductivity systematically. We are also planning to open the research results on the WEB site "Solid-State Conductors Database for Electrochemical Devices (SSCED)" (URL http: //riodbdev.ibase.aist.go.jp/ssced/en/index.html) of the research information database (RIO-DB), AIST. Less