| Autor: |
Bualan Khumpaitool, Jinda Khemprasit, Suriyasit Kaen-ngam, Phalakorn Kamkhou |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
Journal of Magnetism and Magnetic Materials. 323:2408-2412 |
| ISSN: |
0304-8853 |
| DOI: |
10.1016/j.jmmm.2011.05.014 |
| Popis: |
Iron-doped nickel oxide (Fe0.01Ni0.99O, abbreviated as FNO) nanoparticles were prepared by sol–gel process using 1,3-propanediol as a solvent and also as a chelating agent, and calcined at the various temperatures (400–1000 °C) for 2 h. The phase composition and the microstructure of the calcined products were investigated by X-ray diffraction and scanning electron microscopy techniques, respectively. Magnetic properties were measured at room temperature using a vibrating sample magnetometer. All calcined samples showed the single phase of FNO cubic rock-salt structure without the presence of any impurity phases. The crystallite size from XRD and particle size from SEM increased as calcining temperature increased. The FNO powders calcined at 400−600 °C revealed the uniform and dense spherical particles in nanosize. The room-temperature ferromagnetism was observed for all samples. When the calcining temperature was increased, the saturation magnetization decreased whereas the coercivity increased, corresponding to the less dense and larger particles. The calcined sample at 400 °C had the best magnetic properties with the highest Ms of 5.34 emu/g (at 10 kOe) and the lowest Hc of 372 Oe. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect