Low temperature preparation of nanocrystalline Sr0.5Ba0.5Nb2O6 powders using an aqueous organic gel route

被引：51
|
作者：
Li, Y
Zhao, JP [1 ]
Wang, B
机构：
[1] Harbin Inst Technol, Dept Appl Chem, Harbin 150001, Peoples R China
[2] Harbin Inst Technol, Ctr Composite Mat, Harbin 150001, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 2004年 / 39卷 / 03期
基金：
中国国家自然科学基金;
关键词：
metals; oxides; chemical synthesis;
D O I：
10.1016/j.materresbull.2003.11.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nano-sized Sr0.5Ba0.5Nb2O6 (SBN50) ceramic powders have been synthesized by an aqueous organic gel route. Homogeneous Sr-Ba-Nb precursor gels are prepared with Ba-EDTA, Sr-EDTA, and Nb-citrate complex as source of Sr, Ba, and Nb, respectively. Citric acid and ethylenediaminetetraacetic acid (EDTA) were used as the chelating agents. The structural variation of the SBN powder with annealing temperature was studied by TG-DTA, FT-IR and XRD. The precursor gel on calcination at 800 degreesC for 2 h produces a pure tungsten bronze SBN phase and the corresponding average particle size is 30-50 nm. The influences of the pH and the molar ratio of citric acid:Nb cation on the formation of homogeneous Sr-Ba-Nb precursor gels were also studied. The results show that a homogeneous Sr-Ba-Nb precursor gel with no precipitate is formed at pH 8 and the optimum molar ratio of citric acid and the metal cations is 3:1. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：365 / 374
页数：10
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