Abstract The results of magnetic and electrical measurements of ZnCr2S4 – nanoparticles (NPs) synthesized by mechanical alloying method showed an almost ideal paramagnetic state with the weak ferromagnetic short-range interactions derived from a small positive paramagnetic Curie-Weiss temperature of θ = 0.9 K and the presence of magnetic NPs confirmed by the significantly lower value of the effective magnetic moment (μeff = 2.089 μB/f.u.) compared to the μeff = 5.215 μB/f.u. for bulk spinel as well as n-type semiconducting behavior with an extrinsic region not thermally activated and with an intrinsic region with an activation energy of 0.253 eV. Broadband dielectric spectroscopy measurements showed the relaxation processes only in the intrinsic region of the electrical conductivity, i.e. above 170 K, in which the dipole relaxation becomes faster as temperature rise. These results are interpreted in the framework of the Cole-Cole function and a hopping variable range model including structural defects.

中文翻译：

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ZnCr2S4 – 纳米粒子的电学和磁学特性

摘要 通过机械合金化方法合成的 ZnCr2S4 – 纳米粒子 (NPs) 的磁和电测量结果显示出几乎理想的顺磁状态，具有弱铁磁短程相互作用，来自 θ = 0.9 K 的小正顺磁居里 - 魏斯温度和与体尖晶石的 μeff = 5.215 μB/fu 相比，有效磁矩 (μeff = 2.089 μB/fu) 的显着较低值证实了磁性 NPs 的存在以及具有非热非本征区域的 n 型半导体行为激活并具有激活能量为 0.253 eV 的本征区域。宽带介电光谱测量显示仅在电导率的本征区域内发生弛豫过程，即高于 170 K，其中偶极弛豫随着温度的升高而变得更快。这些结果在 Cole-Cole 函数和包含结构缺陷的跳跃变量范围模型的框架中进行了解释。