کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1621662 | 1005750 | 2010 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Characterization of nanosized spinel ferrite powders synthesized by coprecipitation and autocombustion method Characterization of nanosized spinel ferrite powders synthesized by coprecipitation and autocombustion method](/preview/png/1621662.png)
Magnetic nanoparticles of magnetite (Fe3O4) and NiCuZn-doped magnetite (Ni0.35Cu0.15Zn0.5Fe2O4) were prepared by coprecipitation and by sol–gel combustion methods accordingly. The average size, d, of magnetite nanoparticles (d = 12 nm) and the NiCuZn ferrite nanoparticles ignited at about 250 °C (d = 30 nm) was estimated from X-ray diffraction patterns. The Mössbauer spectroscopy revealed the existence of the paramagnetic doublet in both samples. For magnetite, coercive force of about 400 Oe was found at 5 K. Likewise, the coercive field of the NiCuZn-doped magnetite nanoparticles decreases with Fe2+ substitution at low temperature (260 Oe). This behavior can be explained taking into account the fact that the magnetocrystalline anisotropy constant of Fe3O4 is higher than that of NiCuZn ferrite.
Journal: Journal of Alloys and Compounds - Volume 495, Issue 2, 16 April 2010, Pages 509–512