Synthesis of LaF_3 superfine powder by microwave heating method

摘要

LaF3 superfine powder was synthesized from La（CH3COO）3 and NH4F by micro wave heating method,using ethanol or pure water as dispersants respectively. Th e results of XRD and SEM indicate that the superfine powder has high purity,reg ular particle shape and narrow distribution of granularity. The granularity of t he best sample is in the range of 100200 nm.The influence of different dispersants on the crystal degree and microstructure was discussed. After the su perfine powder was formed into a slice at pressure of 2560 MPa,its ele ctrochemical impedance spectroscopy was tested by electrochemical impedance spec troscopy（EIS） measurement. The result shows that the grain refining of LaF3 po wder increases its ionic conductivity. Compared with traditional preparation met hods of LaF3 powder,the advantages of microwave heating method were summarize d.