Effects of microstructure on the magnetic properties of polycrystalline NiMn^sub 2^O^sub 4^ spinel oxides

Polycrystalline NiMn2O4 samples were synthesized by sol-gel method at 500 °C (S500), 700 °C (S700), and 800 °C (S800). The three samples were then structurally characterized by X-ray diffraction and Rietveld refinement. Results indicate that samples are single phase and crystallize in the Fd3¯m spac...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 469; p. 108
Main Authors Cabral, A J Freitas, Remédios, C M R, Gratens, X, Chitta, V A
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier BV 01.01.2019
Subjects
Chemical synthesis
Ferrimagnetism
Hysteresis loops
Lattice strain
Magnetic fields
Magnetic properties
Magnetic transitions
Magnetism
Microstructure
Polycrystals
Sol-gel processes
Spinel
X-ray diffraction
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Summary:Polycrystalline NiMn2O4 samples were synthesized by sol-gel method at 500 °C (S500), 700 °C (S700), and 800 °C (S800). The three samples were then structurally characterized by X-ray diffraction and Rietveld refinement. Results indicate that samples are single phase and crystallize in the Fd3¯m space group with spinel structure. Williamson-Hall analysis shows that samples present different lattice strains. NiMn2O4 compounds show the magnetic transition from ferrimagnetic to paramagnetic at nearly 100 K. Hysteresis loops measured at T = 1.7 K after cooling the samples under magnetic field are asymmetric along the field axis.
ISSN:0304-8853
1873-4766