用鸡蛋蛋清作络合剂制备MnFe_2O_4尖晶石铁氧体的方法

Synthesis of MnFe_2O_4 Spinel Ferrite by A New Route Using Egg White as Complex

介绍了一种以新鲜蛋清蛋白为络合剂,用溶胶-凝胶法制备MnFe2O4尖晶石铁氧体的新方法,并探索最佳合成条件。研究发现此法反应条件温和且性能较好,最低可以在450℃下制成单相MnFe2O4尖晶石铁氧体,最佳制备条件为500℃烧结5h并淬火。最佳条件下制备的铁氧体结晶度好,粒度均匀且粒径大小在15nm左右,室温下具有较高的比饱和磁化强度和矫顽力,分别为54.07emu·g-1和338Oe,剩磁比Mr/Ms=0.273。

The single phase MnFe2O4 spinel ferrite is synthesized by a simple, environmentally friendly and cost-effective route, which uses Mn（NO3 ）2, Fe（NO3 ）3 and fresh egg white in an aqueous medium. The synthesis conditions are investigated. The lowest synthesis temperature of single-phase MnFe2O4 spinel ferrite is 450℃, and the best preparation conditions are being sintered at 500℃/5h then quenched in ice-water mixture. The XRD, SEM, Vi- brating Sample Magnetometer （VSM） and infrared analysis show that the samples prepared at the best preparation condition are good crystalline with the particle size of 15nm. The saturation magnetization is 54. 07emu· g-1, the coercivity is 338Oe, and the remanence ratio is Mr/Ms=0. 273 at room temperature.