摘要
在1173和1273K以NiO和Fe2O3为原料,以TiO2和MnO2为添加剂,固相合成了NiFe2O4,用XRD和SEM对试样进行了表征,建立了NiFe2O4特征衍射峰强度与合成时间的关系。没有添加剂时,将温度从1173K提高到1273K时,合成NiFe2O4的反应速度并没有增加;在原料中加入0.5%(质量分数)TiO2,合成NiFe2O4的反应速率随着温度的升高而增加;用1%(质量分数)MnO2作为添加剂后,合成NiFe2O4的反应速率显著升高,扫描电镜结果证实添加TiO2和MnO2提高了试样的致密度,改善了其烧结性能。用零级反应动力学方程求得合成NiFe2O4反应的速率系数。
NiFe2O4 was prepared by solid synthetics from NiO and Fe2O3 with 0.5wt% TiO2 and 1wt% MnO2 as additives at 1173 and 1273K,and XRD and SEM were used to characteristize the product.The relationships between the strength of the characteristic diffraction peak of NiFe2O4 and time have been established.Without additive,the synthetic velocity of NiFe2O4 didn＇t increase as increasing sintering temperature.With 0.5wt% TiO2 as additive,the synthetic velocity increases as elevating temperature.In case that 1wt% MnO2 as additive,the synthetic velocity of NiFe2O4 is increased greatly.The SEM analysis also shows the addition of both TiO2 and MnO2 improved the density of the solid sample and the function of MnO2 is better than that of TiO2.The kinetic data is processed by zero order kinetic equation and the rate coefficient of synthesis of NiFe2O4 was calculated.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第4期680-682,686,共4页
Journal of Functional Materials
基金
国家自然科学基金重点资助项目(50834001)
