Charge Ordering and Antiferromagnetic Transition in La_(0.67-x)Pr_xCa_(0.33)MnO_3 (x=0～0.67) Polycrystalline  

作　　者：曹晓明 卢遵铭 王立恒 李养贤 

机构地区：[1]School of Material Science and Engineering, Hebei University of Technology [2]Hebei No.1 Electric Power Construction Company

出　　处：《Journal of Rare Earths》2007年第S1期204-206,共3页稀土学报（英文版）

基　　金：the Nature Science Foundation of Hebei Province (E2006000058);Doctor Foundation of Hebei Univ.Tech.

摘　　要：Polycrystalline samples of La0.67-xPrxCa0.33MnO3(x=0～0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling). It revealed that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x<0.4). With increasing doping content (x>0.5), the ferromagnetic transition disappeared and the antiferromagnetic transition (TN) was dominant. Charge ordering (TCO) also emerged when x>0.36. The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.Polycrystalline samples of La0.67-xPrxCa0.33MnO3(x=0～0.67) were synthesized by a conventional solid state reaction. X-ray diffraction revealed that the samples were all of single phase with an orthorhombic distorted perovskite structure. The magnetization depended on temperature measured in FC (field cooling) and ZFC (zero field cooling). It revealed that the compounds mainly underwent a ferromagnetic transition (TC) when the less Pr doped (x<0.4). With increasing doping content (x>0.5), the ferromagnetic transition disappeared and the antiferromagnetic transition (TN) was dominant. Charge ordering (TCO) also emerged when x>0.36. The transition temperatures TN and TCO would change with the Pr doping content. The phase separation could be used to explain these characters occurred in these polycrystalline samples.

关 键 词：charge ordering ANTIFERROMAGNETIC phase separation rare earths 

分 类 号：O614.33[理学—无机化学]