材料期刊网

Strontium doped perovskite-type Nd0:7Sr_0:3MnO₃ 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 Nd0:7Sr_0:3MnO₃ ceramics ranges from 51 to 93 nm, and the fine particles contain two phases of crystalline phase and amorphous phase. For the Nd_0:7Sr_0:3MnO₃ 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.