通过XAFS对Ce0.5Zr0.5O2混合氧化物进行的局部结构分析。

Local structure analyses of Ce0.5Zr0.5O2 mixed oxides by XAFS.

作者信息

Nagai Y, Yamamoto T, Tanaka T, Yoshida S, Nonaka T, Okamoto T, Suda A, Sugiura M

机构信息

Toyota Central R&D Labs, Inc., Aichi Japan.

出版信息

J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):616-8. doi: 10.1107/s0909049500017520.

DOI:10.1107/s0909049500017520

PMID:11512871

Abstract

Three types of CeO2-ZrO2 with the same composition (Ce/Zr = 1) were prepared by different methods, exhibited the different oxygen storage/release capacity (OSC). To investigate the relationship between the OSC and the local structure, the Ce and Zr K-edges XAFS spectra for these samples were measured. The features of Fourier transforms of these samples were different from each other. This suggested that the OSC was remarkably exerted by the local structure around Ce and Zr. The quantitative curve-fitting analysis of EXAFS was applied, and it was concluded that homogeneous Ce(0.5)Zr(0.5)O2 solid solution at atomic level exhibited the highest OSC among these CeO2-ZrO2 with the same composition (Ce/Zr = 1).

摘要

通过不同方法制备了三种具有相同组成（Ce/Zr = 1）的CeO₂-ZrO₂，它们表现出不同的储氧/释氧能力（OSC）。为了研究OSC与局部结构之间的关系，测量了这些样品的Ce和Zr K边XAFS光谱。这些样品的傅里叶变换特征彼此不同。这表明OSC显著受Ce和Zr周围局部结构的影响。应用EXAFS的定量曲线拟合分析，得出在原子水平上均匀的Ce(0.5)Zr(0.5)O₂固溶体在这些具有相同组成（Ce/Zr = 1）的CeO₂-ZrO₂中表现出最高的OSC。