钴基铁酸盐的室温合成和表征

采用氧化-沉淀法在室温下合成了不同钴含量的铁酸盐。不同反应时间时的样品的IR和XRD谱图分析表明，钴基铁酸盐是通过中间体绿锈形成的。通过调节初始溶液中Co/Fe比(Co/Fe分别为： 1/20, 1/15, 1/10, 1/7, 1/5, 1/3)合成了钴含量分别为Co/Fe=0.05, 0.06, 0.08，0.12，0.17，0.18的钴基铁酸盐，并通过IR, XRD, SEM和化学测定分析了上述铁酸盐的化学计量，结构和形貌。实验结果表明： 在室温条件下，随初始溶液中钴含量的增加，钴在尖晶石结构中占据八面体空隙中Fe3+的位置，且钴含量的增加不利于尖晶石结构的形成。

Synthesis and Characteristic of Cobalt Bearing Ferrite Particles at Room Temperature

Cobalt bearing magnetite particles were synthesized by aerial oxidation of ferrous and cobalt ions at alkaline condition and room temperature. The samples obtained at different time intervals during reaction were subjected to XRD and IR, and it was indicated that the cobalt-bearing ferrites were produced through green-rust intermediate phase. Different compounds were synthesized using 1/20, (1/15,) 1/10, 1/7, 1/5 and 1/3 Co~(2 )/Fe~(2 ) starting ratios, and Co-ferrites with Co/Fe of 0.05, 0.06, 0.08, 0.12, 0.17, 0.18 were (obtained.) The chemical composition, microstructure and micrograph of those precipitates were characterized by chemical analysis, IR, XRD and SEM. The results revealed that Co~(2 ) replaced Fe~(3 ) at octahedral position in spinel structure, and the increase of Co in initial solution showed deleterious effect on the crystallinity of the precipitates.