Structural and Magnetic Properties of NiZn Ferrite Nanoparticles Synthesized by a Thermal Decomposition Method
| Autor: | Moonhee Choi, Jin Ah Hwang, Byeong Kwon Ju, Myoung Pyo Chun, Hyo Soon Shin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Analytical chemistry Sintering Nanoparticle chemistry.chemical_element 02 engineering and technology Zinc lcsh:Technology 01 natural sciences lcsh:Chemistry Lattice constant 0103 physical sciences superparamagnetic General Materials Science lcsh:QH301-705.5 Instrumentation Scherrer equation 010302 applied physics Fluid Flow and Transfer Processes NiZn ferrite lcsh:T Process Chemistry and Technology General Engineering 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 chemistry lcsh:TA1-2040 Ferrite (magnet) nanoparticles Particle size spinel ferrite lcsh:Engineering (General). Civil engineering (General) 0210 nano-technology lcsh:Physics Superparamagnetism |
| Zdroj: | Applied Sciences Volume 10 Issue 18 Applied Sciences, Vol 10, Iss 6279, p 6279 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10186279 |
| Popis: | Ni1&minus xZnxFe2O4 (x = 0.5, 0.6, 0.7) nanoparticles were synthesized by a thermal decomposition method. The synthesized particles were identified as pure spinel ferrite structures by X-ray diffraction analysis, and they were calculated to be 46&ndash 51 nm in diameter by the Scherrer equation, depending on the composition. In the FE-SEM image, the ferrite nanoparticles have spherical shapes with slight agglomeration, and the particle size is about 50 nm, which was consistent with the value obtained by the Scherrer equation. The lattice parameter of the ferrite nanoparticles monotonically increased from 8.34 to 8.358 Å as the Zn concentration increased from 0.5 to 0.7. Initially, the saturation magnetization value slowly decreases from 81.44 to 83.97 emu/g, then quickly decreases to 71.84 emu/g as the zinc content increases from x = 0.5, through 0.6, to 0.7. Ni1&minus xZnxFe2O4 toroidal samples were prepared by sintering ferrite nanoparticles at 1250 ° C and exhibited faceted grain morphologies in the FE-SEM images with their grain sizes being around 5 µ m regardless of the Zinc content. The real magnetic permeability (&mu &prime ) of the toroidal samples measured at 5 MHz was monotonically increased from 106, through 150, to 217 with increasing the Zinc content from x = 0.5, through 0.6, to 0.7. The cutoff frequency of the ferrite toroidal samples was estimated to be about 20 MHz from the broad maximum point in the plot of imaginary magnetic permeability (&mu &Prime ) vs. frequencies, which seemed to be associated with domain wall resonance. |
| Databáze: | OpenAIRE |
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