Nd_(1-x)Sr_xMn_(1-y)CuyO_3/NiFe_2O_4复合体系的磁电阻效应研究  

Magnetoresistance effect of Nd_(1-x)Sr_xMn_(1-y)Cu_yO_3/NiFe_2O_4 composites

作　　者：何智伟[1] 唐贵德[1] 刘力虎[1] 侯登录[1] 郝普[2] 刘逸鹏[3] 杨连祥[1] 潘成福[1] 聂向富[1] 

机构地区：[1]河北师范大学物理学院,河北石家庄050016 [2]石家庄师范专科学校物理系,河北石家庄050000 [3]衡水师范专科学校物理系,河北衡水053000

出　　处：《功能材料》2004年第1期28-30,33,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10074013)

摘　　要：　采用溶胶 凝胶法制备了Nd1-xSrxMn1-yCuyO3(x=0.33、0.2,y=0.05、0.2)微粉,平均粒径约为150nm;采用化学共沉淀法制备了NiFe2O4微粉,平均粒径为70nm;将两种粉体充分混合、压成片状后烧结成多晶块体复合材料。经测量NiFe2O4质量百分比为30%的Nd0.67Sr0.33Mn0.8Cu0.2O3/NiFe2O4复合样品在1.8T磁场作用下,在293～315K温度范围内磁电阻MR基本保持在-13.6%,说明在室温附近温度稳定性较好。The Nd1-xSrxMn1-y CuyO3 (x=0.33, 0.2, y=0.05, 0.2) powder were prepared by sol-gel process. NiFe2O4 powder were prepared by chemical coprecipitation method. From the scanning electron microscope (SEM) photos, the average diameter of Nd1-xSrx Mn1-y CuyO3 particles was about 150 nm; one of the NiFe2O4 particles was about 70 nm. Composite pellets were prepared by mixed fully the two kind of powders, pressed and sintered. It was found that magnetoresistance (MR) value of (Nd0.67Sr0.33 Mn0.8Cu0.2O3)0.7)/ (NiFe2O4)0.3 composites was about -13.6% in the temperature range from 293 K to 315 K where applied magnetic field was 1.8 T, therefore, the MR temperature stability of this composite was better than other some similar materials.

关 键 词：Nd1-xSrxMn1-yCuyO3/NiFe2O4复合体系 磁电阻效应 类钙钛矿结构 软磁材料 

分 类 号：TM271.2[一般工业技术—材料科学与工程]