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CHARACTERIZATION AND MAGNETIC PROPERTIES OF CAPPED CoFe2O4 NANOPARTICLES FERRITE PREPARED IN CARBOXYMETHYLCELULLOSE SOLUTION
| Content Provider | Semantic Scholar |
|---|---|
| Author | Pui, Aurel Gherca, Daniel Carja, Gabriela Mangeron, D. |
| Copyright Year | 2011 |
| Abstract | Inverse-spinel oxide, cobalt ferrite CoFe2O4, has been synthesized by co-precipitation method, using as capping agent Carboxymethylcelullose (CMC) solution. The cubic structure (S.G. Fd-3m) was determined from X-ray diffraction (XRD) using a X-ray diffractometer The average crystallite size (13 nm) were calculated by using (311) peaks and Scherres formula. The particle size, chemical composition and external morphology of the annealed powders were characterized by scanning electron microscopy, SEM. The IR spectra of as-prepared, annealed at 300 and 500 o C of cobalt ferrite show the broads bands assigned to the stretching vibration of the water, organic bonds C-H, C=O from CMC. This indicates that the CMC molecules are present on the surface of nanoparticles and do not undergo chemical change, such as oxidation of the double bond or molecular decomposition during the heat treatment. The shifted peaks from 610 and 460 cm -1 to 584 and 446 cm -1 indicate the migration of metallic cations from the octahedral to the tetrahedral sites. The magnetic properties at room temperature of fine particles were investigated using a vibrating sample magnetometer, VSM. From the obtained hysteresis loops, the saturation magnetization (Ms), remanance magnetization (Mr) and coercivity (Hc) where determined. The obtained values are: Ms= 52.151 emu/g), Mr= 18.544 emu/g, Hc= 634.66Oe. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.chalcogen.ro/1783_Pui.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
