0.8ZnFe_2O_4-0.2 MnFe_2O_4纳米颗粒磁化性质的实验研究  

Experimental Study on Magnetization Behavior of 0.8ZnFe_2O_4-0.2MnFe_2O_4 Magnetic Nanoparticles

作　　者：李强[1] 李建[1] 王跃[1] 白浪[1] 

机构地区：[1]西南大学物理科学与技术学院,重庆400715

出　　处：《西南大学学报（自然科学版）》2007年第9期47-51,共5页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市自然科学基金资助课题(CSTC2005BB4106);西南师范大学发展基金资助课题(SWNUF2004005).

摘　　要：对采用化学共沉淀法制备的ZnFe2O4,MnFe2O4以及两者混合的3种纳米颗粒体系的磁化性质进行了实验研究.在室温下测量了它们的磁化曲线,结果表明ZnFe2O4颗粒是顺磁性的,MnFe2O4及0.8Zn Fe2O4-0.2 MnFe2O4混合颗粒呈超顺磁性.MnFe2O4颗粒的实验曲线和无相互作用的Langevin理论曲线间有较大偏差.混合颗粒体系的磁化强度不等于单独两种颗粒的磁化强度的简单相加.应用偶极子相互作用和颗粒团聚效应解释了MnFe2O4颗粒和混合颗粒体系的磁化性质.The magnetization behaviors of three nanoparticle systems （ZnFe2O4 and MnFe2O4 prepared chemical coprecipitation and their mixture） were studied in this experiment. Based on their magnetizatic curves determined at room temperature, ZnFe2O4 showed paramagnetism, and MnFe2O4 and 0.8ZnFe2O4-0.2MnFe2O4 mixture particles showed superparamagnetism. Comparing the experimental curve of Mn-Fe2O4 particles with the inter-relationless Langevin theory curve demonstrated a considerable difference between them. Magnetic Strength of the mixture particles is not equivalent to the simple sum of the Ma netic Strength of the two component particles. The magnetization behavior of MnFe2O4 and the mixt particle system can be interpreted according to the effects of interaction between dipoles and fine partic aggregation.

关 键 词：磁性纳米颗粒 磁化强度 相互作用 

分 类 号：O361.3[理学—流体力学] O469[理学—力学]