Low-Temperature Magnetoresistance Effect in the Hydrothermally Synthesized La0.98 Ca0.02MnO3-δ/γ-Mn2O3 Granular System

被引：0
|
作者：
王锦辉
刘公强
朱浩
顾本喜
谷坤明
都有为
机构：
[1] China
[2] Dept.of Physics
[3] Nanjing 210093
[4] Shanghai 200030
[5] Shanghai Jiaotong Univ.
[6] Nanjing Univ.
[7] National Lab. of Solid State Microstructures
来源：
Journal of Shanghai Jiaotong University | 2005年 / 01期
关键词：
powder processing; nanoparticles; ceramics; magnetotransport;
D O I：
暂无
中图分类号：
O614 [金属元素及其化合物];
学科分类号：
070301 ; 081704 ;
摘要：
The low-temperature magnetoresistance (LTMR) in hydrothermally synthesized La 0.98 Ca 0.02 MnO 3- δ / γ -Mn 2O 3 granular system was investigated. As-prepared powders are amorphous except for a small amount of crystalline phase LaCO 3OH. After sintered at 1 073 K or above, La 0.98 Ca 0.02 MnO 3- δ perovskite and secondary phase γ -Mn 2O 3 coexist. A large LTMR of ～65% at 127 K and ～50% at 0 K in the sample with mean grain size of 23 nm was observed. The observation of a large magnetoresistance over a wide temperature interval could be of importance for useful applications.
引用
收藏
页码：91 / 94
页数：4
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