高性能 SrLa_xFe_(12-x)O_(19) 超微粉的合成与表征

Synthesis and Characterization of High Performance SrLa xFe 12-x O 19 Ultrafine Powders

本文首次利用柠檬酸法合成了ＳｒＬａｘＦｅ１２－ｘＯ１９超微粉末。用Ｘ射线衍射仪，Ｍｏｓｓｂａｕｅｒ谱，振动样品磁强计，透射电子显微镜等仪器对粉末的结构、性能及形貌进行表征。考察了合成条件对性能的影响。结果表明，Ｌａ３＋可以明显提高ＳｒＦｅ１２Ｏ１９的磁学性能，在ｘ＝０．３，即ＳｒＬａ０．３Ｆｅ１１．７Ｏ１９，其粉末的矫顽力达到５１７．４ｋＡ／ｍ（６５００Ｏｅ），比饱和磁化强度σｓ为７１．

In this paper,SrLa xFe 12-x O 19 ultrafine powders were synthesized by citrate method.Their structure,properties and forms were studied by means of X-ray diffractormeter,Mossbauer spectra,vibrating sample magnetometer,transition electron microgragh,etc.The results have shown that La 3+ ion can obviously improve the magnetic properties of SrFe 12 O 19 When x=0.3,it gives SrLa 0.3 Fe 11.7 O 19 .The coercive force is 517.4kA/m(6500 Oe) and specific saturation magnetization(σ s) is 71.43 emug/g.