Magnesium chromite (MgCr₂O₄) spinel oxide powder was synthesized by sol-gel auto-combustion technique. Room temperature X-ray powder diffraction pattern was refined by Fullprof which confirmed the formation of single phase cubic structure with Fd3m space group. The complex impedance spectroscopy was employed to investigate the charge transport mechanism within the temperature range of 423–573K and the impedance data were finely fitted for temperature dependent cole-cole plot to track down the equivalent circuit model [(R_GC_G)(R_GbQ_Gb)]. The temperature and frequency dependent AC conductivity was found to follow Jonscher double power law and the slope of conductivity indicated the correlated barrier hopping (CBH) as a dominant conduction model in the material. The grain and grain boundary polarization was analyzed by electric modulus which confirmed the two phase response of the material. The dielectric relaxation exhibited dispersion in the low frequency region which owed to the interfacial effects.

采用溶胶-凝胶自燃技术合成了亚铬酸镁（MgCr ₂ O ₄）尖晶石粉。Fullprof对室温X射线粉末衍射图进行了精制，证实了Fd3m空间群的单相立方结构的形成。复阻抗谱用于研究在423–573K温度范围内的电荷传输机制，并且针对与温度相关的科尔-科尔图精确拟合了阻抗数据，以追踪等效电路模型[（R _G C _G）（R _Gb Q _Gb）]。发现温度和频率相关的交流电导率遵循Jonscher双幂定律，电导率的斜率表明相关的势垒跳跃（CBH）是材料中的主导传导模型。通过电模量分析了晶粒和晶界极化，证实了材料的两相响应。由于界面效应，介电弛豫在低频区域表现出分散。