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Cation Distribution Assisted Tuning of Magnetization in Nanosized Magnesium Ferrite
Author(s) -
Thanh Nguyen Kim,
Loan To Thanh,
Duong Nguyen Phuc,
Anh Luong Ngoc,
Nguyet Dao Thi Thuy,
Nam Nguyen Huu,
Soontara Siriwat,
Klysubun Wantana,
Hien Than Duc
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700397
Subject(s) - materials science , magnetization , synchrotron , analytical chemistry (journal) , crystallite , spin canting , ferrite (magnet) , rietveld refinement , transmission electron microscopy , annealing (glass) , valence (chemistry) , nuclear magnetic resonance , crystal structure , crystallography , chemistry , magnetic field , metallurgy , nanotechnology , optics , composite material , physics , organic chemistry , chromatography , quantum mechanics
The MgFe 2 O 4 nanoparticles are synthesized by combustion method and annealed at different temperatures from 500 to 1000 °C. Magnetic properties, morphology, valence states of iron, crystal structure, and microstructure of the samples are investigated systematically by vibrating sample magnetometer, field emission scanning electron microscope, transmission electron microscopy, X ‐ ray absorption spectroscopy, and synchrotron X ‐ ray diffraction. Cation distribution is determined from synchrotron X ‐ ray diffraction data using Rietveld refinement combined with extended X ‐ ray absorption fine structure spectroscopy. The results indicates that all the samples are phase‐pure with crystallite size ranging from 11 to 41 nm. By adjusting the annealing temperature, cation distribution and particle size can be changed, and consequently leading to the change in structure and magnetic properties. The saturation magnetization of the samples are enhanced significantly compared to that of the bulk material. The variation of magnetic properties is discussed based on cation distribution, particle size, valence state, surface effect, and spin canting.