Preparation of high-quality BiFeO3 nanopowders via a polyacrylamide gel route
Preparation of high-quality BiFeO3 nanopowders via a polyacrylamide gel route
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DOI：
10.1016/j.jallcom.2009.02.068
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发表时间：
2009-07
影响因子：
6.2
通讯作者：
T. Xian;H. Yang;Xioaming Shen;Jinlong Jiang;Zhiqiang Wei;W. Feng
中科院分区：
文献类型：
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作者：
T. Xian;H. Yang;Xioaming Shen;Jinlong Jiang;Zhiqiang Wei;W. Feng
本文报道了一种丙烯酰胺凝胶法制备BiFeO3纳米粉体的方法。在这条路线中，溶液的凝胶化是通过形成聚合物网络实现的：聚丙烯酰胺，它为颗粒的生长提供了结构框架。结果表明，采用EDTA作螯合剂，可以得到纯BiFeO3相。此外，我们发现，当使用的丙烯酰胺是阳离子的量（以摩尔计）的9倍，并添加适量的葡萄糖到前体溶液中，可以大大改善粒子的形态。SEM观察表明，在最佳工艺条件下制备的粉体粒径小且均匀，颗粒呈近似球形，多分散，无团聚和粘连现象。DSC测量确定了我们的产品中存在两个铁性相变，即，反铁磁转变温度为1370 °C，铁电转变温度为1830 °C。
We report here an acrylamide gel route to prepare BiFeO3nanopowder. In this route, the gelation of the solution is achieved by the formation of a polymer network: the polyacrylamide, which provides a structural framework for the growth of particles. It is demonstrated that pure BiFeO3phase can be obtained using EDTA as the chelating agent. In addition, we find when the used acrylamide is 9 times the amount (in mole) of the cations and an appropriate amount of glucose is added to the precursor solution, the particle morphology can be much improved. SEM observations reveal that the powder prepared under the optimal conditions has a small and uniform particle size, and the particles are almost spherical and polydisperse without any agglomeration or adhesion. DSC measurements identify the presence of the two ferroic phase transitions in our product, i.e., the antiferromagnetic transition at ∼370°C and the ferroelectric transition at ∼830°C.