Spinel ferrites MPr_0.1Fe_1.9O₄ (M = Mn, Cu, Mg) were prepared by sol-gel technique. X-ray Diffraction (XRD) showed that along with spinel phase, secondary phase (PrFeO₃) appeared for all composition. Scanning electron microscopy showed the inhomogeneous grain size. Temperature dependence normalized AC susceptibility and Curie temperature of spinel ferrites revealed that in all the samples transitions from multi domain (MD) to single domain (SD) occurred. Magnetic properties exhibited the soft nature of all the samples at room temperature. Temperature dependent resistivity of all the samples increased as the temperature was enhanced, representing the semiconducting behavior. Dielectric constant and complex dielectric constants were determined at the high-frequency range of 1 MHz to 3 G Hz. Impedance analysis clearly demonstrated the role of grains and grain boundary in the spinel ferrites. Cole-cole plots of all the samples showed only one semi-circle at high-frequency. All the samples elaborated the good picture of Koop’s theory and Maxwell-Wagner model. The low value of coercivity and high magnetization of Mn-based spinel ferrites made it suitable for hyperthermia applications.

通过溶胶-凝胶技术制备了尖晶石铁氧体MPr _0.1 Fe _1.9 O ₄（M = Mn，Cu，Mg）。X射线衍射（XRD）显示，与尖晶石相，次生相（PrFeO ₃）出现了所有组成。扫描电子显微镜显示晶粒尺寸不均匀。温度依赖性归一化的交流磁化率和尖晶石铁氧体的居里温度表明，在所有样品中都发生了从多畴（MD）到单畴（SD）的转变。在室温下，磁性表现出所有样品的柔软性质。随着温度的升高，所有样品的温度相关电阻率均增加，代表半导体行为。在1 MHz至3 G Hz的高频范围内确定介电常数和复介电常数。阻抗分析清楚地表明了尖晶石铁素体中晶粒和晶界的作用。所有样品的科尔-科尔图在高频下仅显示一个半圆形。所有样本都很好地说明了库普理论和麦克斯韦-瓦格纳模型。Mn基尖晶石铁氧体的矫顽力值低且磁化强度高，使其适合高温应用。