材料科学与工程学报2013，Vol.31Issue(1)：101-106,158,7.
La0.60Sr0.40-xNaxMnO3钙钛矿材料在室温附近磁电阻的温度稳定性
Temperature Stability of Magnetoresistance around Room Temperature in Perovskite Materials La0.60Sr0.40-xNaxMnO3
摘要
Abstract
Perovskite rare-earth manganites polycrystalline samples formulated as La0.60Sr0.40-xNaxMnO3 (x = 0. 00, 0. 10, 0. 15, 0. 20, 0. 30, 0. 33, 0. 35) were synthesized by sol-gel method. It is found that when Sr+2 ions were partly substituted by Na+1 ions, the Curie temperature of the substituted samples decreased to room temperature and the room temperature magnetoresistance (MR) increased obviously than un-substituted La0.60Sr0.40MnO3. Under an applied filed of 1. 8T, the maximum MR for the sample La0.60Sr0.07 Na0.33 MnO3 at 292 K was 24. 4% , 2. 8 times more than La0.60Sr0.40MnO3; and there was a stable MR of 3. 9%(±0. 2%) in the temperature range of 285K to 345K for the sample La0.60Sr0.25 Na0.15MnO3. Therefore, the room temperature magnetoresistance and the temperature stability of MR were obviously improved. Up to now, no similar reports have been found concerning so good temperature stability of MR in so wide temperature range around room temperature. These are prpbably significant to magnetoresistance materials application.关键词
锰氧化物/磁电阻/溶胶-凝胶法Key words
manganite/ magnetoresistance/ sol-gel method分类
数理科学引用本文复制引用
赵福伟,唐贵德,丁东..La0.60Sr0.40-xNaxMnO3钙钛矿材料在室温附近磁电阻的温度稳定性[J].材料科学与工程学报,2013,31(1):101-106,158,7.基金项目
河北省自然科学基金资助项目(E2011205083),河北省基础研究重点资助项目(10965125D) （E2011205083）
