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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Electrical conduction behaviour in K2NiF4-type Ca2MnO3.98 below room temperature
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Electrical conduction behaviour in K2NiF4-type Ca2MnO3.98 below room temperature

机译：室温以下K2NiF4型Ca2MnO3.98的导电行为

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摘要

Electrical transport in polycrystalline ceramics of K2NiF4-type Ca2MnO3.98 has been investigated as a function of temperature using complex-plane impedance analyses, dielectric properties, DC conductivities by the four-probe method, thermoelectric power and magnetic susceptibilities. The bulk conductivities were obtained using the complex-plane impedance analyses. The magnetic properties indicate that antiferromagnetically ordered magnetic moments are canted and there is a weak ferromagnetic contribution below the Neel temperature of 113 K, The thermoelectric power changes from positive Values to negative ones at around 200 K with increasing temperature. Above about 200 K, the dielectric relaxation peak due to a hopping process involving small polarons manifests itself. The temperature dependencies of the dielectric: relaxation process and the bulk conductivities suggest that the charge carriers responsible for the conduction are strongly localized. This is directly supported by the fact that the activation energy for the bulk conduction is nearly equal to that for the dielectric relaxation, The experimental results above about 200 K have been interpreted in terms of a hopping process involving small polarons. At lower temperatures, either multiphonon jumping processes of small polarons are frozen out or charge transport between impurity states takes place. [References: 54]
机译：使用复平面阻抗分析，介电特性，通过四探针法的直流电导率，热电功率和磁化率，研究了K2NiF4型Ca2MnO3.98在多晶陶瓷中的电传输与温度的关系。使用复平面阻抗分析获得整体电导率。磁性能表明，反铁磁有序的磁矩被倾斜，并且在Neel温度113 K以下，铁磁贡献微弱。随着温度的升高，热电功率在200 K左右从正值变为负值。在约200 K以上，由于涉及小极化子的跳变过程而引起的介电弛豫峰会显现出来。电介质的温度依赖性：弛豫过程和整体电导率表明，负责传导的电荷载流子被强烈定位。本体传导的活化能几乎等于介电弛豫的活化能这一事实直接证明了这一点。约200 K以上的实验结果已经用涉及小极化子的跳跃过程进行了解释。在较低的温度下，小极化子的多声子跳跃过程被冻结，或者在杂质态之间发生电荷传输。 [参考：54]

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