气泡液膜法制备Ni_(0.7)Zn_(0.3)Fe_2O_4铁氧体的前驱体纳米粒子

Preparation of precursor nanoparticle of Ni_(0.7)Zn_(0.3)Fe_2O_4 ferrite by gas bubble liquor membrane process

采用新颖的气泡液膜法,将Zn2+、Ni2+和Fe3+与OH-的共沉淀反应在气泡液膜中完成,制备了Ni0.7Zn0.3Fe2O4铁氧体前驱体纳米粒子,经元素分析、FT-IR、XRD和SEM等表征。实验结果表明,前驱体较精确地保持了原料溶液中Zn2+、Ni2+和Fe3+的配料摩尔比。前驱体分别经300、400、500、600、700或800℃烧结,制得Ni0.7Zn0.3Fe2O4铁氧体,用XRD和VSM表征。结果表明,在700℃烧结制得的Ni0.7Zn0.3Fe2O4铁氧体的粒径为26.92nm,磁饱和磁化强度sσ=64.22A.m2/kg,剩余磁化强度rσ=14.25A.m2/kg,内秉矫顽力jHc=16kA/m。将这种Ni-Zn铁氧体分散到合成油中,制成耐高温磁性液体。

By the novel gas bubble liquor membrane （GBLM） process the precursor nanoparticle of Ni0.7 Zn0.3 Fe2O4 ferrite was prepared with the coprecipitation reaction of aqueous solution of Zn2＋ , Ni2＋ and Fe3＋ with OH- in a gas bubble liquor membrane carried out, use of the aqueous solution of sodium stearate as the coating agent. The precursor was characterized by means of elemental analysis, FT-IR, SEM and XRD. The experi- mental results had indicated that the mole ratio of Zn2＋ , Ni2＋ and Fea＋ in the substrate solution was kept accu- rately to the mole ratio in the precursor. Ni0.7Zn0.3Fe2O4 ferrites were obtained after the precursor was sintered at 300,400,500,600,700 or 800℃ respectively. The ferrites were determined with XRD and VSM. On the basis of the experimental results the granule size, as,at and jHc of the ferrite gained from the precursor sintered at 700℃ were found to be 26.92nm, 64.22A· m2/kg,14.25A· m2/kg and 16kA/m respectively. A heat-resistant ferrite fluid was made with the dispersion of Ni0 7 Zn0.3Fe2O4 ferrite into synthetic oil.