The influence of ionic radii on the grain growth and sintering-resistance of Ln2Ce2O7 (Ln = La, Nd, Sm, Gd)

被引：56

作者：

Wang, Chunjie ^{[1
]}

Wang, Yue ^{[2
]}

Zhang, Aihua ^{[1
]}

Cheng, Yongliang ^{[3
]}

Chi, Feng ^{[1
]}

Yu, Zhen ^{[1
]}

机构：

[1] Bohai Univ, Coll Engn, Jinzhou 121013, Peoples R China

[2] Bohai Univ, Coll New Energy, Jinzhou 121013, Peoples R China

[3] Chinese Acad Sci, Lanzhou Inst Chem Phys, Lab Clean Energy Chem & Mat, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE | 2013年 / 48卷 / 23期

基金：

中国国家自然科学基金;

关键词：

THERMOPHYSICAL PROPERTIES; CERIUM OXIDE; HYDROTHERMAL METHOD; SOLID-SOLUTIONS; CRYSTAL-GROWTH; STABILITY; CERAMICS;

D O I：

10.1007/s10853-013-7625-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rare earth cerium oxides (Ln(2)Ce(2)O(7), Ln = La, Nd, Sm, and Gd) with cubic-fluorite structure were prepared by hydrothermal method using cetyltrimethyl ammonium bromide as surfactant. X-ray diffraction (XRD), thermogravimetric analysis/differential scanning calorimetry (TG/DSC), Raman spectroscopy, and field emission scanning electron microscopy (FESEM) were utilized to characterize the phase structure, thermal decomposition, and morphology of the products, respectively. Qualitative analyses indicate that the as-prepared products are fluorite-type structures. The lattice parameter and average crystallite size of the products are closely related to the ionic radii. The activation energy of crystal growth shows an increasing trend with the decrease in ionic radii. The sintering behavior of compacted body was also investigated, revealing that the sintering-resistance properties of Ln(2)Ce(2)O(7) are descending as the order of La2Ce2O7, Nd2Ce2O7, Sm2Ce2O7, and Gd2Ce2O7.

引用

页码：8133 / 8139

页数：7

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