以Fe(NO3)3·9H2O、Sr(NO3)2和C6O7H8为原料,NH3为质子转移剂,在不同pH值条件下,进行低热固相反应,制备出系列前驱体,经900℃灼烧后得到相应产物.采用XRD、SEM和VSM对产物进行表征.结果表明,合成出的产物为平均粒径约100 nm的SrFe12O19纳米粉体.并发现随着pH值从6增加到11,合成产物的XRD衍射峰出现峰值先变大后变小现象;3种晶格参数(a,c,Vcell)出现先减小,后增大规律,而结晶度Xc则先变大,后变小.在pH=l0时,所对应的晶格参数均发生最大拐点变化,因此产物的磁性能表现最佳(M=51.4 A·m2/kg、Mr=29.5 A·m2/kg、Hc=71.2 A/m),表明磁性粒子表面在此条件下磁交换作用最强.
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