【摘要】 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。更多还原

【Abstract】 By the novel gas bubble liquor membrane(GBLM) process the precursor nanoparticle of Ni0.7Zn0.3Fe2O4 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 experimental results had indicated that the mole ratio of Zn2+,Ni2+ and Fe3+ in the substrate solution was kept accurately 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,σs,σr 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 Ni0.7Zn0.3Fe2O4 ferrite into synthetic oil.更多还原