Shunsheng Chen Changping Yang Lingfang Xu Shaolong Tang
材料科学技术（英文）
Strontium doped perovskite-type Nd0:7Sr0:3MnO3 ceramics were synthesized completely by high-energy ball milling raw oxides of Nd2O3, SrCO3 and MnO2. The optimal ball milling time and mass ratio of milling balls to raw materials are 4 h and 10:1, respectively. The grain size of as-milled Nd0:7Sr0:3MnO3 ceramics ranges from 51 to 93 nm, and the fine particles contain two phases of crystalline phase and amorphous phase. For the Nd0:7Sr0:3MnO3 synthesized by ball milling and sequent heat treatment, a remarkable colossal electroresistance (CER) effect is observed and the CER ratio reaches 900% at Curie temperature TC when the load voltage increases from 0.1 to 0.8 V.
关键词:
High-energy ball milling
,
Perovskite structure
,
Colossal electroresistance (CER)
,
Microstructure defect
