Barium hexaferrite nanoparticles are synthesized through co-precipitation technique at different annealing temperature. Series of BaFe_12-xHg_xO₁₉ nanoparticles, 0.00 ≤ x ≤ 0.30, are prepared under the best verified conditions (annealed at 1000°C) to investigate the effect of partial substitution of Hg²⁺ ions on the physical properties of BaFe₁₂O₁₉ nanoparticles. The hysteresis loops at room temperature show the behavior of hard ferromagnetic. The estimated values of saturation magnetization $M_s$, remnant magnetization $M_r$ and magnetic moment $m_B$ rise as Hg²⁺ ions content increases till x = 0.10, beyond which they reduce. A reverse trend is obtained for intrinsic coercivity Hi and coercivity Hc versus Hg²⁺ ions content. BaFe_12-xHg_xO₁₉ nanoparticles are investigated through the measurements of electron paramagnetic resonance (EPR). The calculated EPR parameters show an enhancement for BaFe_12-xHg_xO₁₉ nanoparticles up to x = 0.10. The obtained results reveal that samples under investigation can be suitable candidate for different industrial applications.

通过共沉淀技术在不同的退火温度下合成了六价铁酸钡纳米粒子。在最佳验证条件下（在1000°C退火）制备0.00≤x≤0.30的一系列BaFe _12-x Hg _x O ₁₉纳米颗粒，以研究Hg ²⁺离子部分取代对BaFe物理性质的影响₁₂ O ₁₉纳米粒子。室温下的磁滞回线显示出硬铁磁的行为。饱和磁化强度的估计值${\mathrm{中号}}_s$，剩余磁化强度 ${\mathrm{中号}}_{\mathrm{[R}}$ 和磁矩 ${米}_{乙}$当Hg ²⁺离子含量增加到x = 0.10时，离子浓度会上升，在此之后它们会减少。对于固有矫顽力Hi和矫顽力Hc相对于Hg ²⁺离子含量，获得了相反的趋势。通过电子顺磁共振（EPR）的测量研究了BaFe _12-x Hg _x O ₁₉纳米粒子。计算得出的EPR参数显示BaFe _12-x Hg _x O ₁₉纳米粒子的增强作用，最高x = 0.10。获得的结果表明，所研究的样品可以适合于不同的工业应用。