A study of the properties of SrFe_{12鈭?span style='font-style: italic'>x}Co_xO₁₉ nanoparticles

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• 作者：S.E. Mousavi Ghahfarokhi ; F. Ranjbar ; M. Zargar Shoushtari
• 关键词：Nanoparticle ; Strontium hexaferrite ; Cobalt ; Dielectric ; Electric
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：January, 2014
• 年：2014
• 卷：349
• 期：Complete
• 页码：80-87
• 全文大小：1613 K

文摘

In this paper, the nanoparticles of SrFe_12鈭?em>xm>Co_m>xm>O₁₉ (m>xm>=0-2) were synthesized via the sol-gel technique. The XRD results showed that all samples with m>xm>鈮?.5 are single-phase. It seems that the Fe³⁺ ions are substituted by Co²⁺ ions in the crystallography sites of the SrFe₁₂O₁₉ structure, but for the m>xm>>0.5 cases, the phase of CoFe₂O₄ is materialized in the samples. The DC electrical resistivity decreases with the increase of cobalt content up to level of m>xm>=0.5, but it increases on further addition of cobalt. We found that the dielectric constant and the dielectric loss for samples with m>xm>=1 and 1.2 into the pure sample (SrFe₁₂O₁₉), decrease as the Co²⁺ content increases. The variation of AC conductivity (m>蟽m>_ac) with frequency ranging from 500 Hz to 200 KHz shows that electrical conductivity in these ferrites is mainly due to the electron hopping mechanism.