甘氨酸-硝酸盐燃烧法合成BaCeO_3纳米粉末

Synthesis of BaCeO_3 Nanopowders by Glycine-nitrate Combustion Process

为了探寻甘氨酸-硝酸盐燃烧法中对钙钛矿型BaCeO3(BCO)粒径大小的影响,以甘氨酸和金属硝酸盐为原料,合成了BaCeO3纳米粉末,并采用X射线衍射、红外光谱、扫描电镜、透射电镜等技术对产物的物相结构、形貌及粒径进行了研究。结果表明,燃烧后的前驱体在900℃下煅烧2 h后可获得纯正交晶系的BaCeO3相。甘氨酸和硝酸盐的物质的量比(G/n比)对产物结构及形貌有重要的影响。当G/n比为0.5时,产物纯度最高,颗粒的形貌为类球形,粒径大小约为50nm。

Perovskite-type BaCeO3（BCO）is investigated to study the effects of the glycine-nitrate combustion process on the particle size,and BaCeO3 nanopowders are prepared using glycine and metal nitrates as raw materials.The phasestructure,morphology and size of as-prepared samples are investigated by X-ray diffraction（XRD）,Fourier transform infrared spectroscopy（FTIR）,Scanning electron microscopy（SEM） and Transmission electron microscopy（TEM）.The result shows that the pure orthorhombic BaCeO3 can be completely formed when the precursor is calcined at 900 ℃ for two hours.The molar ratio of glycine and metal nitrates（G/n molar ratios）has an important influence on the microstructure and morphology of the as-prepared powders.When the G/n molar ratios are 0.5,the highest purity of samples can be obtained,the samples are composed of nearly spherical particles with sizes of about 50 nm.