高等学校化学学报2001，Vol.22Issue(4)：531-534,4.
纳米晶固溶体Ce0.8Nd0.2O2-δ的合成与表征
Synthesis and Characterization of Nanocrystalline
Ce0.8Nd0.2O2-δ Solid Solution
林晓敏 1李莉萍 2罗微 3苏文辉2
作者信息
- 1. 现在北华大学师范学院物理系工作；吉林大学物理系
- 2. 吉林大学物理系
- 3. 吉林大学无机合成与制备化学教育部重点实验室
- 折叠
摘要
Abstract
The solid solution Ce0.8Nd0.2O2-δ was prepared by sol-gel method. The XRD measurements showed that the product obtained by sintering the fresh gel at 200 ℃ crystallized in a single fluorite structure and its grain size was calculated to be ca. 7.2 nm by Scherrer formula. With the increase of sintering temperature, the grain size of solution increases. A few of Ce3+ ions were detected by EPR measurement. The first-order Raman spectra of the solid solutions exhibited two peaks. The strong band F2g mode at a lower frequency is assigned to symmetric breathing mode of the oxygen atoms around cerium ions, while the weak band at ca. 570 cm-1 is related with the existence of oxygen vacancies. With the grain decrease, the F2g mode shifts to the lower frequency, while the half-height width becomes broaden. The ionic conductivity for the solid solution Ce0.8Nd0.2O2-δ at 500 ℃(σ500 ℃) is 2.65×10-3 S*cm-1, and the activation energy is 0.82 eV.关键词
Ce0.8Nd0.2O2-δ/离子价态/Raman光谱/电导率分类
化学化工引用本文复制引用
林晓敏,李莉萍,罗微,苏文辉..纳米晶固溶体Ce0.8Nd0.2O2-δ的合成与表征[J].高等学校化学学报,2001,22(4):531-534,4.
