Abstract The structural, microstructural, dielectric, impedance, modulus, leakage–current and magnetic characteristics of a double perovskite compound Dy2CoMnO6 have been reported in this communication. We have synthesized the compound by a high-temperature mixed-oxide route. From the analysis of X-ray diffraction data, the structure of the material is found to be monoclinic with lattice parameters: a = 5.5070 A, b = 5.5683 A, and c = 7.7217 A, β = 90.830. The morphological study suggests that the compound has an almost homogeneous scattering and distribution of grains over the surface with small voids. The frequency dependence of dielectric parameter has been discussed according to the Maxwell-Wagner model and different polarization mechanisms. In the study of temperature dependence of dielectric permittivity, we observe a dielectric anomaly that corresponds to the ferroelectric to paraelectric phase transition. In the impedance analysis, we also observe both positive and negative temperature coefficient of resistance (PTCR and NTCR) behavior of the material. The nature of frequency dependence of conductivity has been explained by the Jonscher power law, and thus the conduction process of the material belongs to the overlapping large polaron tunneling model. The activation energy obtained from the relaxation and conduction processes is found to support the process of electron hoping. An analysis of leakage current density characteristics shows that the conduction mechanism in the material follows the space charge limited conduction (SCLC) process. Study of the magnetic hysteresis loop of the material shows the anti-ferromagnetic type of behavior.

中文翻译：

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双钙钛矿Dy2CoMnO6的电、磁和漏电流特性研究

摘要 本文报道了双钙钛矿化合物 Dy2CoMnO6 的结构、微观结构、介电、阻抗、模量、漏电流和磁特性。我们通过高温混合氧化物路线合成了该化合物。从 X 射线衍射数据分析，发现该材料的结构为单斜晶系，晶格参数为：a = 5.5070 A，b = 5.5683 A，c = 7.7217 A，β = 90.830。形态学研究表明，该化合物在具有小空隙的表面上具有几乎均匀的颗粒散射和分布。根据 Maxwell-Wagner 模型和不同的极化机制讨论了介电参数的频率依赖性。在介电常数的温度依赖性研究中，我们观察到与铁电到顺电相变相对应的介电异常。在阻抗分析中，我们还观察了材料的正负温度系数电阻（PTCR 和 NTCR）行为。电导率频率依赖性的性质已经用 Jonscher 幂定律解释过，因此材料的传导过程属于重叠大极化子隧穿模型。发现从弛豫和传导过程中获得的活化能支持电子跃迁过程。漏电流密度特性分析表明，材料中的传导机制遵循空间电荷限制传导 (SCLC) 过程。对材料磁滞回线的研究显示出反铁磁类型的行为。