Surfactant assisted synthesis of aluminum doped SrFe{sub 10}Al{sub 2}O{sub 19} hexagonal ferrite

Journal Article · Thu May 07 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4919254· OSTI ID:22410078

Wang, L.; Mishra, S. R. ^[1]; Poudyal, N.; Liu, J. P. ^[2]

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1. Department of Physics, The University of Memphis, Memphis, Tennessee 38152 (United States)
2. Department of Physics, The University of Texas, Arlington, Texas 76019 (United States)

M-type aluminum doped SrFe{sub 10}Al{sub 2}O{sub 19} were synthesized via co-precipitation method using cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The effects of CTAB content (x = 0, 1, 3, and 9 wt. %) on the formation, structure, morphology, magnetic, and dielectric properties of the SrFe{sub 10}Al{sub 2}O{sub 19} nanoparticles were investigated. X-ray diffraction results show elimination of α-Fe{sub 2}O{sub 3} phase from samples prepared using CTAB. Morphological changes including grain and crystallite size was noticed with the increase in the CTAB content. With the increase in CTAB, powder particles grew in hexagonal plates. A linear increase in saturation magnetization, Ms, with CTAB content was observed from 56.5 emu/g at 0% CTAB to 66.4 emu/g at 9% CTAB. This is a net increase of 17.5% in Ms. The coercivity (Hc ∼ 5700 Oe) of sample reached maximum at 1% CTAB and reduced with further CTAB content reaching to a minimum value of 4488 Oe at 9% CTAB. A slight increase in Curie temperature (735 K) was also observed for samples synthesized using CTAB as compared to that of sample prepared in the absence of CTAB (729 K). Samples synthesized with CTAB show higher dielectric constants as compared to samples prepared without CTAB, while dielectric constant for all samples show decrease in value with the increase in frequency. These results imply that CTAB may act as a crystallization master, controlling the nucleation and growth of SrFe{sub 10}Al{sub 2}O{sub 19} crystal. The study delineates the scope of improving magnetic properties of ferrites without substitution of metal ions.

• OSTI ID: 22410078
• Journal Information: Journal of Applied Physics, Vol. 117, Issue 17; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
AMMONIUM COMPOUNDS
BROMIDES
COERCIVE FORCE
COMPARATIVE EVALUATIONS
COPRECIPITATION
CRYSTALLIZATION
CURIE POINT
DOPED MATERIALS
FERRITES
MAGNETIC PROPERTIES
MAGNETIZATION
MORPHOLOGICAL CHANGES
MORPHOLOGY
NANOPARTICLES
PERMITTIVITY
STRONTIUM COMPOUNDS
SURFACTANTS
SYNTHESIS
X-RAY DIFFRACTION