原生矿物直接制备锰钡铁氧体材料研究

Preparation of manganese barium ferrite materials with primary mineral by direct method

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(Mn_xBaFe_(12-x)O_(19))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(M_S)和最大矫顽力(H_C)分别为40.5A·m^2/kg和3.58×10~5A/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 precipita- tion 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 crys- tallinity and well microstructure manganese barium ferrite with Ms =40.5 A · m^2/kg and Hc =3.58 × 10^5 A/m can be synthesized in precipitation pH= 9 by calcining at 1 000 ℃ for 2 h.