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.
出处
《功能材料》
EI
CAS
CSCD
北大核心
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)
