Abstract The dielectric behavior and alternating current conduction mechanism of nanocrystalline (Co,Ni)Al 2 O 4 aluminate spinel have been investigated over a broad frequency range (1 kHz to 1 MHz) for different temperatures i.e. 50 °C to 90 °C. The low cost and environmental friendly method has been used to developed the nanocrystalline (Co,Ni)Al 2 O 4 spinel phase. The formation of homogeneous single phase of nanocrystalline (Co,Ni)Al 2 O 4 spinel has been confirmed by X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The dielectric response and alternating current conductivity have been observed by inductance, capacitance and resistance bridge which confirms traditional dielectric behavior of (Co,Ni)Al 2 O 4 . The frequency dependent complex dielectric impedance behavior has also been explored. The activation energy of (Co,Ni)Al 2 O 4 has been found nearly 0.3–0.1 eV b/w the frequency range 1 kHz to 1 MHz. The alternating current conduction mechanism reveals the signature of correlated barrier hopping by following the power law where the maximum barrier length has been found 144 ± 0.25 MeV. This alternating current conduction also follows the Meyer-Neldel rule in the low frequency region.

中文翻译：

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(Co,Ni)Al 2 O 4 纳米尖晶石的介电响应和交流电导率

摘要 纳米晶 (Co,Ni)Al 2 O 4 铝酸盐尖晶石的介电行为和交流传导机制在很宽的频率范围（1 kHz 到 1 MHz）上进行了研究，不同温度下，即 50 °C 到 90 °C。已使用低成本和环境友好的方法开发纳米晶(Co,Ni)Al 2 O 4 尖晶石相。X 射线衍射、透射电子显微镜和扫描电子显微镜证实了纳米晶 (Co,Ni)Al 2 O 4 尖晶石的均匀单相的形成。已经通过电感、电容和电阻桥观察到介电响应和交流电导率，这证实了 (Co,Ni)Al 2 O 4 的传统介电行为。还研究了频率相关的复介电阻抗行为。已发现 (Co,Ni)Al 2 O 4 的活化能在 1 kHz 至 1 MHz 的频率范围内接近 0.3–0.1 eV b/w。交流电传导机制通过遵循幂律揭示了相关势垒跳跃的特征，其中最大势垒长度为 144 ± 0.25 MeV。这种交流电传导在低频区域也遵循 Meyer-Neldel 规则。