标题:
EDTA络合法制备 Ba(Zn1/3Nb2/3)O3纳米粉体及其热学性能Thermal Properties of Ba(Zn1/3Nb2/3)O3Nanopowders via EDTA-Gel Method
作者:
房丽敏, 陆正武
关键字:
EDTA络合, 纳米粉体, Ba(Zn1/3Nb2/3)O3, 热学性能EDTA-Gel; Nanopowders; Ba(Zn1/3Nb2/3)O3; Thermal Properties
期刊名称:
《Material Sciences》, Vol.4 No.2, 2014-03-26
摘要:
采用EDTA (乙二胺四乙酸)络合法制备了Ba(Zn1/3Nb2/3)O3 (BZN)纳米粉体，利用X射线衍射仪、傅里叶变换红外光谱以及热重分析仪分析了前驱体的热分解过程和煅烧过程中的相变，同时采用扫描电子显微镜观察了最终粉体形貌。结果表明，650℃低温煅烧1 h得到钙钛矿相BZN陶瓷纳米粉体，粉体形状接近于球状，平均直径约40 nm，且在微区团聚形成较大的块状聚集体。所制备的粉体在1200℃烧结2 h得到高致密度(理论密度的98%以上)、单相的BZN陶瓷。
Ba(Zn1/3Nb2/3)O3 (BZN) nanopowders have been prepared via an (Ethylene Diamine Tetraacetic Acid) EDTA-gel method. The decomposition process and the phase transformation during calcination of the precursors are investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Thermogravimetry/Differential thermal analysis (TG/DTA), and the morphology of the resulting powders is observed by Scanning electron microscopy (SEM). The results show that perovskite phase BZN nanopowders with near-spherical shape (average diameter of ~ 40 nm) are obtained after calcining at 650˚C for 1 h. Moreover, the powders agglomerate in micro area, forming into large bulk aggregates. After sintering at 1200˚C for 2 h, the samples show a single BZN phase with a high bulk density (>98%) .