以重庆市城口县碳酸钡矿、碳酸锰矿为原料,采用化学共沉淀法制备了锰钡铁氧体(MnxBaFe12-xO19)材料.重点研究了沉淀pH值、煅烧温度、煅烧时间等工艺条件对锰钡铁氧体形成的影响.通过X射线衍射分析(XRD)、扫描电子显微分析(SEM)和振动样品磁强计(VSM)等手段对锰钡铁氧体的性能进行了表征.实验结果表明,煅烧温度对锰钡铁氧体的形成具有决定性的影响,当沉淀pH值=9,煅烧温度1 000℃,煅烧时间为2h时,制备出的锰钡铁氧体具有结晶度高、微观形貌好,最大饱和磁化强度(Ms)和最大矫顽力(HC)分别为40.5 A· m2/kg和3.58×105 A/m.
Using mineral of manganese carbonate and barium carbonate as materials from Chengkou,Chongqing,manganese barium ferrite materials were prepared by chemical co-precipitation method.Effects of the precipitation pH,calcination temperature and calcination time on the formation of manganese barium ferrite materials were studied.The manganese barium ferrite was characterized by X ray diffraction analysis (XRD),scanning e lectron microscopy (SEM) and vibrating sample magnetometer (VSM).The experimental results show that the calcination temperature has a decisive influence on the formation of a manganese barium ferrite.The high crystallinity and well microstructure manganese barium ferrite with Ms=40.5 A · m2/kg and Hc=3.58× 105 A/m can be synthesized in precipitation pH=9 by calcining at 1 000 ℃ for 2 h.
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