Molten salt route of well dispersive barium titanate nanoparticles
Molten salt route of well dispersive barium titanate nanoparticles
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DOI：
10.1016/j.powtec.2011.11.043
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发表时间：
2012-02
影响因子：
5.2
通讯作者：
Yan Zhang;Liqiu Wang;D. Xue
中科院分区：
文献类型：
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作者：
Yan Zhang;Liqiu Wang;D. Xue
以八水合氢氧化钡（Ba(OH)2·8H2O）、二氧化钛（TiO2）和共晶盐（NaCl-KCl）为原料，采用熔盐法合成分散性良好的钛酸钡（BaTiO3）纳米颗粒。采用x射线衍射、傅里叶变换红外光谱、紫外-可见漫反射光谱和场发射扫描电镜对制备的样品进行了表征。结果表明，batio3可以在600℃低温下形成。batio3的结晶度随着温度的升高而升高。SEM图像清楚地表明，即使在800℃的高温下，也能成功地获得分散性良好的batio3纳米颗粒。大多数batio3纳米颗粒在形状上呈现六边形轮廓。batio3纳米颗粒的平均尺寸约为50nm。同时，与晶态TiO2相比，非晶态TiO2更有利于BaTiO3的形成，特别是减少了其他不需要的相。最后，提出了分散良好的batio3纳米颗粒在熔盐体系中的形成机理。分散良好的batio3纳米颗粒在900℃低温下开始表现出一定的烧结能力。
Well dispersive barium titanate (BaTiO3) nanoparticles were synthesized by molten salt method using barium hydroxide octahydrate (Ba(OH)2·8H2O), titanium dioxide (TiO2), and the eutectic salts (NaCl–KCl) as raw materials. The as-prepared samples were characterized by X-ray diffraction, Fourier transform infrared spectrometry, UV–vis diffuse reflectance spectra, and field emission scanning electron microscopy. The present results show that BaTiO3can be formed at low temperature of 600°C. The crystallinity of BaTiO3increases with the temperature rising. SEM images clearly indicate that well dispersive BaTiO3nanoparticles can also be successfully obtained even at high temperature of 800°C. Most BaTiO3nanoparticles display hexagonal outline in shape. The average size of BaTiO3nanoparticles is around 50nm. Meanwhile, compared with crystalline TiO2, amorphous TiO2is favorable for the formation of BaTiO3, especially decreasing other undesired phases. In the end, the formation mechanism of well dispersive BaTiO3nanoparticles is proposed for this molten salt system. Well dispersive BaTiO3nanoparticles begin to show some sintering ability at low temperature of 900°C.