Preparation of calcium-doped lanthanum chromites powders by citric acid-EDTA complexometry

被引：0
|
作者：
Li, Sheng-Li [1 ]
Zhu, Xin-De [1 ]
Sun, Liang-Cheng [2 ,3 ]
Ao, Qing [1 ]
机构：
[1] School of Materials Science and Engineering, Shandong University, Ji'nan 250061, China
[2] Baton Research Institute of Rare Earths, Baotou 014030, China
[3] National Engineering Research Center of Rare Earth Metallurgy and Functional Materials, Baotou 014030, China
来源：
Chinese Rare Earths | 2013年 / 34卷 / 03期
关键词：
Perovskite - Powders - Sol-gels - Binary alloys - Citric acid - Chelation - Ions;
D O I：
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学科分类号：
摘要：
EDTA was used as assistant complexing agent to chelate with calcium ion solely, then mixed with citric acid, so the problem that citric acid chelated with calcium ion poorly was solved, and the three kinds of cation, La3+, Cr3+, Ca3+, were chelated in the gel uniformly and stably. The structure and decomposition of the gel and the morphology of the powder were investigated by ATR, TG, DSC, XRD and TEM. The perovskite phase La0.9Ca0.1 CrO3 was formed by decomposition of the dried gel at 500°C, 200°C lower than citric acid gel system. Our investigation also showed that calcium doping played an active role in restraining the volatilization of chromium during the gel calcination.
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页码：41 / 44
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