The effect of substituting Fe³⁺ ions by a combination of divalent Ni²⁺ and tetravalent Ti⁴⁺ in SrM hexaferrites synthesized by mechanical ball-milling technique were reported. Standard SrFe₁₂O₁₉ hexagonal ferrite (P6₃/mmc) was confirmed by measured XRD patterns. The phase purity was also confirmed by the XPS. The SEM images showed a clear hexagonal-shape particles in the prepared ferrites. The elemental distribution obtained from EDX spectra for SrFe_12–2xNi_xTi_xO₁₉ (x = 0.2, 0.4, 0.6 and 0.8) was consistent with stoichiometry of the starting powder. X-ray photoelectron spectra confirmed the existence of Fe²⁺, Fe³⁺, Ni²⁺, Ni³⁺ and Ti⁴⁺ ions. The presence of Fe²⁺ and Ni³⁺ was correlated with an electron transfer between Fe³⁺ and Ni²⁺. By increasing the Ni concentration, we found that some Fe³⁺ ions are transferred to Fe²⁺ ions, while some of the Ni²⁺ ions are transferred to Ni³⁺ ions. Irreversible ZFC and FC curves were recorded in the 4–300 K temperature range. The isothermal magnetization curves confirmed the ferromagnetic behavior for all synthesized samples. A small variation in the saturation and remnant magnetizations along with a sharp reduction in the coercivity fields with the increase of x were observed in a wide range of temperatures. The broad peak observed in the temperature dependence of the saturation magnetization for x = 0.8 may be referred to the spin reorientation transition. The decrease in the coercivity agrees with the behaviour of the magneto crystalline anisotropy while the first anisotropy constant exhibits a fast decrease above x = 0.6.

报道了通过机械球磨技术合成的 SrM 六铁氧体中二价 Ni ²⁺和四价 Ti ⁴⁺的组合取代 Fe ³⁺离子的效果。标准 SrFe ₁₂ O ₁₉六方铁氧体 (P6 ₃ / mmc ) 通过测量的 XRD 图案得到确认。XPS 也证实了相纯度。SEM 图像显示制备的铁氧体中有清晰的六边形颗粒。从 SrFe _{12–2 x} Ni _x Ti _x O ₁₉ ( x = 0.2、0.4、0.6 和 0.8) 与起始粉末的化学计量一致。X射线光电子能谱证实了Fe ²⁺、Fe ³⁺、Ni ²⁺、Ni ³⁺和Ti ⁴⁺离子的存在。Fe ²⁺和Ni ^{3+ 的}存在与Fe ³⁺和Ni ²⁺之间的电子转移相关。通过增加 Ni 浓度，我们发现一些 Fe ³⁺离子被转移到 Fe ²⁺离子，而一些 Ni ²⁺离子被转移到 Ni ³⁺离子。在 4-300 K 温度范围内记录了不可逆的 ZFC 和 FC 曲线。等温磁化曲线证实了所有合成样品的铁磁行为。在很宽的温度范围内观察到随着x的增加，饱和磁化强度和剩余磁化强度的微小变化以及矫顽力场的急剧减小。在x  = 0.8的饱和磁化强度的温度依赖性中观察到的宽峰可以称为自旋重定向转变。矫顽力的降低与磁晶各向异性的行为一致，而第一各向异性常数在x  = 0.6以上表现出快速降低。