Abstract Magnesium and calcium co-substituted Ba M-type nanohexaferrite (NHFs) is fabricated via sol-gel auto-combustion technique. The phase formation was proved by XRD powder pattern, FESEM and HR-TEM. Magnetic properties of Ba1-2xCaxMgxFe12O19 (x ≤ 0.1) NHFs investigated by Mossbauer Spectroscopy. The variations in line width, quadrupole splitting, isomer shift, the cation distribution of Ca2+ and Mg2+ ions and hyperfine magnetic field values were estimated. The AC magnetic susceptibility and ZFC-FC measurements were also performed for the Ba1-2xCaxMgxFe12O19 (x = 0.02 and 0.08) NHFs. The MFC-MZFC results do not show blocking temperature peak, indicating the ferrimagnetic (FM) behavior of prepared products. Different models including Neel-Arhenius (N-A), Vogel-Fulcher (V-F) and critical slowing down (CSD) were tested to evaluate the AC-magnetic susceptibility behaviors. It is demonstrated that the magnetic interactions are important for x = 0.02 NHFs.

中文翻译：

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Mg-Ca 离子共取代 BaFe12O19 纳米六铁氧体的交流磁化率和超精细相互作用

摘要 通过溶胶-凝胶自燃技术制备了镁和钙共取代的 Ba M 型纳米六铁氧体 (NHFs)。通过XRD粉末图、FESEM和HR-TEM证明了相的形成。通过 Mossbauer 光谱研究 Ba1-2xCaxMgxFe12O19 (x ≤ 0.1) NHF 的磁性。估计了线宽、四极分裂、异构体位移、Ca2+ 和Mg2+ 离子的阳离子分布以及超精细磁场值的变化。还对 Ba1-2xCaxMgxFe12O19 (x = 0.02 和 0.08) NHF 进行了交流磁化率和 ZFC-FC 测量。MFC-MZFC 结果未显示阻塞温度峰值，表明制备产品的亚铁磁 (FM) 行为。不同的模型，包括 Neel-Arhenius (NA)，测试 Vogel-Fulcher (VF) 和临界减速 (CSD) 以评估交流磁化率行为。结果表明，磁相互作用对于 x = 0.02 NHF 很重要。