In order to improve the resistivity of oxidation , dysprosium cobalt ferrite magnetic fluids were prepared 摘要為了提高磁流體的抗氧化能力,制備了鏑鈷鐵氧磁流體。
According to the sample prepared by hydrothermal method , the doping cations can enter the spinel lattice . rare earth cations mostly occupy position b because of their big radius . cerium are oxidized to ce4 + , whose radius is relatively small , and ce4 + mostly occupies position a . as a whole , the coercivity of cobalt ferrite doped with rare earth element is bigger than that of pure cobalt ferrite 結果表明,對水熱法制備的鐵氧體粒子,雜質離子能夠進入其尖晶石晶格中,并因稀土離子的半徑較大,而絕大部分占據(jù)尖晶石的b位,鈰元素因被氧化成為四價離子,離子半徑相對較小,而主要占據(jù)a位。