This work focused on the effect of dipolar interactions between particles on the magnetic heating efficiency of nanoferrites under an alternating magnetic field. The low-temperature hydrothermal method was adopted to obtain nanoparticles composed of Co_0.3Zn_0.7Fe₂O₄ and Co_0.5Zn_0.5Fe₂O₄. The single-phase spinel structure of the samples was confirmed from X-ray diffraction data via Rietveld refinement technique. Transmission electron microscopy showed that the Co_0.3Zn_0.7Fe₂O₄ and Co_0.5Zn_0.5Fe₂O₄ nanoparticle ferrites had sizes of 10 and 12 nm, respectively. Blocking temperature showed a nonlinear and logarithmic decreasing tendency as a function of the applied magnetic field. The value of coercivity decreased with temperature and conformed to the Callen and Callen law. Dipolar interactions among nanoparticles caused magnetization to deviate from standard superparamagnetic behavior. This characteristic can be explained using the interacting superparamagnetic model. As a consequence, dipolar interactions reduced the specific loss power of Co_0.3Zn_0.7Fe₂O₄ and Co_0.5Zn_0.5Fe₂O₄ under 80 Oe at 178 kHz with increasing nanoparticle concentration.

这项工作集中于粒子之间的偶极相互作用对交变磁场下纳米铁氧体磁加热效率的影响。采用低温水热法制备了由Co _0.3 Zn _0.7 Fe ₂ O ₄和Co _0.5 Zn _0.5 Fe ₂ O ₄组成的纳米颗粒。样品的单相尖晶石结构通过Rietveld精制技术从X射线衍射数据确定。透射电子显微镜显示Co _0.3 Zn _0.7 Fe ₂ O ₄和Co _0.5 Zn _0.5Fe ₂ O ₄纳米粒子铁氧体的尺寸分别为10和12 nm。阻断温度随施加的磁场而呈非线性和对数下降趋势。矫顽力的值随温度而降低，并符合卡伦和卡伦定律。纳米粒子之间的偶极相互作用导致磁化强度偏离标准的超顺磁性行为。可以使用相互作用的超顺磁性模型来解释此特性。结果，偶极相互作用降低了Co _0.3 Zn _0.7 Fe ₂ O ₄和Co _0.5 Zn _0.5 Fe ₂ O ₄的比损耗功率。 随着纳米粒子浓度的增加，在178 kHz的80 Oe下温度降低。