CAJ | 학술논문

pH值对明胶网络凝胶法制备镍锌铁氧体纳米粉体具有决定性的作用,最佳pH值范围为9至11.加入添加剂可在较低的煅烧温度下使杂相消失并得到单相镍锌铁氧体产物.当明胶的用量由5%上升至20%(质量分数,下同)时,经700 ℃煅烧2 h后,产物晶粒由46 nm减少至10 nm,可通过改变明胶浓度的方法调控镍锌铁氧体的晶粒.镍锌铁氧体的比饱和磁化强度和矫顽力分别随粉体晶粒尺寸的增加呈先下降后上升的趋势.
pH치대명효망락응효법제비얼자철양체납미분체구유결정성적작용,최가pH치범위위9지11.가입첨가제가재교저적단소온도하사잡상소실병득도단상얼자철양체산물.당명효적용량유5%상승지20%(질량분수,하동)시,경700 ℃단소2 h후,산물정립유46 nm감소지10 nm,가통과개변명효농도적방법조공얼자철양체적정립.얼자철양체적비포화자화강도화교완력분별수분체정립척촌적증가정선하강후상승적추세.
The pH value was the important parameter in the preparation processing of nickel-zine ferrite nano-powder via gelatin-network gel method, and the optimum pH value was in the range of 9-11. Monophase nickel-zine ferrite without impurity phase could be obtained via adding additive after sintering at low temperature. Crystalline size of nickel-zine ferrite powder was reduced to 10 nm from 46 nm after sintered at 700 ℃ for 2 h as the gelatin concentration increasing from 5 wt% to 20 wt%. Different crystalline sizes of the nickel-zine ferrite were obtained under different gelatin concentration. The specific saturation magnetization and the coercivity of the nickel-zine ferrite first decreased and then increased with the increase of the crystalline size of the powder.