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A simple synthesis of Fe3O4 powders and their Structure, magnetic and electrical transport propertie

powders and their Asimple synthesis of Fe3O4 Structure, magnetic and electrical transport properties 1* K.L. Liu, Y. D. Du, C.Y.Li zhang haiyang Department of Physics, Zhenzhou electicl power collage People’s Republic of China. ABSTRACT FeO powders with highly crystalline have been synthesized by asol-gel auto bustion 34 synthesis method acpanying thermal process. The phase structures, morphologies of FeO 34 have been characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive x-ray spectrometer (EDX). The results show that plete and highly crystalline nature magnetite powders can be obtained. Furthermore, the room-temperature magnetizations and the resistance of FeO powders were also measured. 34 The maximum magnetization of sample S1, S2and S3 is 88.3, 87.32 and 89.4emu/g at the applied magnetic field 5kOe, respectively, which are larger than the saturation magnetization of the bulk γ-FeO (76emu/g). It is proved further that FeO powders can 2334 be synthesized by the citrate-nitrate sol-gel auto bustion reaction method. The preliminary reaction mechanism is also discussed. FeO Magnetic materialsHalf metallic Keywords: ;; Sol-gel preparation; 34 1. Introduction Magnetite, FeO, is ferromagnetic inverse spinel structure with an anomalous high 34 Curie temperature of 860 Kand an exceptionally high conductivity [1].In addition, the 1 Corresponding author. Address: Department of Physics, Zhoukou Normal University, Zhoukou, PR * China. Tel:; E-mail