Electric,magnetic and microstructural features of the La_(2)CoFeO_(6) lanthanide ferrocobaltite obtained by the modified Pechini route  

作　　者：J.A.Jaramillo Palacio K.A.Munoz Pulido J.Arbey Rodríguez D.A.Landínez Téllez J.Roa-Rojas 

机构地区：[1]Grupo de Física de Nuevos Materiales,Departamento de Física Universidad Nacional de Colombia,BogotáDC,Colombia [2]Laboratório de Magnetismo e Materiais Magnéticos Departamento de Física,Universidade Federal de Santa Maria Rio Grande do Sul Brazil [3]Grupo de Estudios de Materiales,Departamento de Física Universidad Nacional de Colombia,BogotáDC,Colombia

出　　处：《Journal of Advanced Dielectrics》2021年第3期16-25,共10页先进电介质学报（英文）

基　　金：This work was partially supported by Division of Investigation and Extension(DIEB)of the National University of Colombia,Hermes code 48069,MINCIENCIAS on the project FP80740-243-2019 and Coordenacao de Aperfeicoamento de Pessoal de Nível Superior-Brasil(CAPES)-Finance Code 001.A special thanks to Dr.Julio C.Denardim for facilitating his laboratory equipment at the University of Santiago,Chile.

摘　　要：In the search for new materials with applicable magnetic properties in spintronic devices,the aim of this work is to report the synthesis of the lanthanide ferrocobaltite La_(2)CoFeO_(6) using the modified Pechini route;the experimental study of structural,morphological and magnetic properties,and the analysis of the electronic structure and bands are obtained in the framework of the Density Functional Theory.Rietveld refinement of experimental X-ray diffraction patterns revealed the crystallization of this oxide material in a perovskite-like monoclinic structure,space group P2_(1)/n(#14).Scanning electron microscopy and atomic force microscopy images revealed that the surface morphology is essentially polycrystalline,with mean grain sizes between 177 and 188 nm.The dispersive X-ray spectroscopy suggests that the material obtained contains La,Fe,Co and O in the stoichiometric proportions expected by up to 98%.The magnetic susceptibility curves as a function of temperature indicated that the material is ordered ferromagnetically,showing strong irreversibility effects due to the disorder of the Fe and Co cations in the three crystallographic directions of the structure and to the strong distortions in the FeO_(6) and CoO_(6) octahedra.Magnetic hysteresis curves confirmed the ferromagnetic character of the material for all temperatures evaluated,up to room temperature.I-V response curves revealed a semiconductor-like behavior with a figure of merit exponent 1.53 of the varistor type.The ferromagnetic semiconductor behavior suggests the potential applicability of the material in spintronic technological devices.

关 键 词：Double perovskite Pechini method crystalline structure ferromagnetic response semiconductor behavior 

分 类 号：TG1[金属学及工艺—金属学]