柠檬酸盐法合成钙钛矿型复合氧化物纳米固体材料LaFeO_3

Synthesis of Perovskite-type Nanocrystalline Material Complex Oxide LaFeO_3 by Citrate Process

纳米固体材料(或称毫微晶材料)是近几年发展起来的新兴材料,这是由尺寸为纳米数量级(通常粒径<10～15 nm)的微晶颗粒聚集而成的块状或者薄膜人工固体,其原子排列状态既不同于传统的晶态、非晶态,又不同于尺寸为纳米数量级的超微粒,其结构特点使该材料具有与传统材料极不相同的特殊性能,已引起世界各国科学家的高度重视。

The precursors of LaFeO3 were prepared by cifrnle process and nanocrystals of LaFeO3 were synthesized by a solid phase reaction at 400-500℃ for 2 h. The nanocrystalline material of LaFeO3 was obtained at 0. 5 GPa. The characterization of the samples was carried out by XRD and TEM. The size of the crystals is about 12. 4 nm by TEM. The diffracted X-ray intensity of the compact sample was attributed to the contribution from the LaFeO3 nanocrystals and the interfaces.