采用了一种全新的化学方法(PVP溶液聚合法)成功制备出了La0.8Sr0.2Ga0.83Mg0.17O2.815粉末;研究了不同含量聚合载体(PVP)对结果的影响规律,找到了能保证金属离子在聚合网状结构中均匀分布并防止偏析的最佳的PVP含量;探索了所制备产物在不同温度下的烧结行为.与传统的Pechini法相比,本实验所需有机物聚合载体(PVP)的量更少,这也证明PVP可以作为一种制备LSGM粉末更为有效的载体.而微波具有更高的加热速率,加热时反应体系中不会存在温度梯度,使得反应更加均匀,制备的粉末杂质更少,压片烧结后其晶粒尺寸也更小(2～3μm).
A new chemical route,named microwave-induced polyvinylpyrrolidone(PVP) solution polymerization,has been used to prepare La0.8Sr0.2Ga0.83Mg0.17O2.815 (denoted as LS0.2GM0.17) powder. The effect of different contents of PVP as the polymeric carrier was studied and we obtained the optimum amount of PVP,which could ensure the homogenous distribution of the metal ions in its polymeric network structure and inhibit their segregation from the solution. The behavior of the powder after calcination at different temperatures was studied. The PVP solution process consumed less organics compared with traditional Pechini process. Consequently,PVP was a more effective carrier in the preparation of LSGM. High heating rate and more homogenous heating manner without thermal gradient in the microwave oven resulted in less secondary phases in the LS0.2GM0.17 powder after calcination at 1400℃ for 9 h and smaller pellet grain size (2-3μm) without segregation.
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