中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 4 August 2004 |
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:LaF3superfine powder was synthesized from La(CH3COO)3and NH4F by microwave heating method, using ethanol or pure water as dispersants respectively. The results of XRD and SEM indicate that the superfine powder has high purity, regular particle shape and narrow distribution of granularity. The granularity of the best sample is in the range of 100-200 nm.The influence of different dispersants on the crystal degree and microstructure was discussed. After
the superfine powder was formed into a slice at pressure of 25-60 MPa, its electrochemical impedance spectroscopy was tested by electrochemical impedance spectroscopy(EIS) measurement. The result shows that the grain refining of LaF3 powder increases its ionic conductivity. Compared with traditional preparation methods of LaF3powder, the advantages of
microwave heating method were summarized.
Key words: LaF3; superfine powder; microwave; electrochemical impedance spectroscopy; ionic conductivity
