Magnetic properties of LiFel-xNixO2 compounds including Fe and Ni ions with valance values of +3

ABSTRACTMSc THESISMAGNETIC PROPERTIES of LiFe1-xNixO2COMPOUNDS INCLUDING Fe and Ni IONS withVALANCE VALUES of +3Fatma EMENDEPARTMENT OF PHYSICSINSTITUTE OF NATURAL AND APPLIED SCIENCESUNIVERSITY OF ÇUKUROVASupervisor: Prof. Dr. Kerim KIYMAÇYear: 2005, Pages 59Jury: Prof. Dr. Kerim KIYMAÇProf. Dr. Bekir ÖZÇELİKProf. Dr. Osman SERİNDAĞIn thıs work structural and magnetic properties of LiFe1-xNixO2 compounds( 0≤x≤0,4 ), prepared by solid state reactions method, have been investigated. TheXRD technique was used for the structural analysis, and ESR, magnetisation andhysteresis measurements were done for the detection of magnetic properties. TheXRD analysis shows that all the samples have cubic structure with a latticeparametter of a=4,158 A0 . The ESR measurements indicate a spectroscopic splittingfactor of g=2, indicating that the orbital angular momentum in quenched, and spinangular momentum is dominant. Magnetization and hysterisis measurements indicatethat with increasing amount of Ni concentration the samples gain spin-glass phases attemperatures lower than the dominant antiferromagnetic phase temperatures.Key Words: LiFe1-xNixO2 , Nicel, Iron, magnetism