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- Title
Magnetic and Structural Properties of SrFe<sub>12−x</sub>Cr<sub>x</sub>O<sub>19</sub> (<italic>x</italic> = 0, 0.25, 0.5, 0.75, 1) Hexaferrite Powders Obtained by Sol-Gel Auto-Combustion Method.
- Authors
Roohani, Ebrahim; Arabi, Hadi; Sarhaddi, Reza; Shabani, Ameneh
- Abstract
The crystalline structure and magnetic properties of chromium substituted hexagonal strontium ferrite, SrFe12−xCrxO19 (<italic>x</italic> = 0, 0.25, 0.5, 0.75, 1), nanoparticles have been investigated by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometer (VSM). These materials were prepared by the chemical sol-gel auto-combustion method. From the structural analysis, it was observed that the non-magnetic phase α-Fe2O3 appears after <italic>x</italic> ≥ 0.5 and remains to be a hexagonal magnetoplumbite phase for <italic>x</italic> < 0.5. Various parameters such as lattice constants (<italic>a</italic> and <italic>c</italic>) were calculated from the XRD data. The coercively <italic>H</italic><italic>c</italic> initially decreases and then increases with increasing chromium concentration. The saturation magnetization exhibits an increase as the chromium content increases up to (<italic>x</italic> = 0.25) and then decreases with increase in the Cr content ion from 75.19 to 61.66 emu/g due to the substitution of Fe3+ ions by less magnetic Cr3+ ions. Furthermore, <italic>M</italic><italic>r</italic> continually decreases with increase in the Cr content.
- Subjects
MAGNETIC properties of nanoparticles; SOL-gel materials; SATURATION (Chemistry); X-ray diffraction; MAGNETOMETERS
- Publication
Journal of Superconductivity & Novel Magnetism, 2018, Vol 31, Issue 5, p1607
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-017-4351-7