Low temperature molten salt synthesis of SrTiO3 submicron crystallites and nanocrystals in the eutectic NaCl-KCl
Low temperature molten salt synthesis of SrTiO3 submicron crystallites and nanocrystals in the eutectic NaCl-KCl
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DOI：
10.1016/j.matlet.2009.11.040
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发表时间：
2010-02-15
影响因子：
3
通讯作者：
Zhang, Yong-Cai
中科院分区：
文献类型：
--
作者：
Li, Hui-Ling;Du, Zhen-Ni;Zhang, Yong-Cai
采用共晶NaCl-Cl熔盐法，以SrO 2和两种不同粒径的TiO 2粉体为原料，在700 ℃下合成了SrTiO 3亚微米晶和纳米晶，比传统的固相反应温度（一般> 1000 ℃）低得多。X射线衍射和X射线光电子能谱的表征结果表明，所得产物为纯钙钛矿相SrTiO 3，没有Na、K和Cl离子的污染。扫描电子显微镜和透射电子显微镜图像显示，起始TiO 2在所获得的SrTiO 3的形貌和尺寸中起重要作用：而由TiO 2亚微米微晶衍生的产物包含约95-184 nm的小面亚微米微晶，由TiO 2纳米晶体衍生的产物包含约20-61 nm的方形纳米晶体。此外，在无熔融NaCl-KCl共晶、不同温度和时间、不同TiO 2种类的实验基础上，提出了SrTiO 3亚微米微晶和纳米晶的可能形成机理。(C)2009 Elsevier B. V.保留所有权利。
An eutectic NaCl-Cl molten salts method has been developed for the synthesis of SrTiO3 submicron crystallites and nanocrystals from SrO2 and two kinds (submicron and nano-sized) of TiO2 powders at 700 degrees C, which was much lower than that (generally> 1000 degrees C) of the conventional solid state reactions. The characterization results from X-ray diffraction and X-ray photoelectron spectroscopy revealed that the obtained products were pure perovskite phase SrTiO3 without any contamination of Na, K, and Cl ions. The scanning electronic microscopy and transmission electron microscopy images disclosed that the starting TiO2 played an important role in the morphology and size of the obtained SrTiO3: while the product derived from TiO2 submicron crystallites comprised faceted submicron crystallites of about 95-184 nm, that derived from TiO2 nanocrystals comprised quadrate nanocrystals of about 20-61 nm. Besides, based on the experiments without the molten NaCl-KCl eutectic, at different temperatures and times, and using different kinds of TiO2, the possible formation mechanism of SrTiO3 submicron crystailites and nanocrystals was proposed. (C) 2009 Elsevier B.V. All rights reserved.