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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Ac conductivity and dielectric properties of CuFe_(1-x)Cr _xO_2: Mg delafossite
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Ac conductivity and dielectric properties of CuFe_(1-x)Cr _xO_2: Mg delafossite

机译：CuFe_（1-x）Cr _xO_2：Mg铜铁矿的Ac电导率和介电性能

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摘要

The electrical and dielectric properties of CuFe_(1-x)Cr _xO_2 (0 ≤ x ≤ 1) powders, doped with 3% of Mg and prepared by solid-state reaction, were studied by broadband dielectric spectroscopy in the temperature range from -100 to 150 °C. The frequency-dependent electrical and dielectric data have been discussed in the framework of a power law conductivity and complex impedance and dielectric modulus. At room temperature, the ac conductivity behaviour is characteristic of the charge transport in CuFe_(1-x)Cr_xO_2 powders. The substitution of Fe~(3+) by Cr~(3+) results in an increase in dc conductivity and a decrease in the Cu~+-Cu~+ distance. Dc conductivity, characteristic onset frequency and Havriliak-Negami characteristics relaxation times are thermally activated above -40 °C for x = 0.835. The associated activation energies obtained from dc and ac conductivity and from impedance and modulus losses are similar and show that CuFe _(1-x)Cr_xO_2 delafossite powders satisfy the BNN relation. Dc and ac conductivities have the same transport mechanism, namely thermally activated nearest neighbour hopping and tunnelling hopping above and below -40 °C, respectively.
机译：通过宽带介电谱研究了在-100℃的温度范围内通过固相反应制备的掺有3％Mg的CuFe_（1-x）Cr _xO_2（0≤x≤1）粉末的电学和介电性能。到150°C。已经在幂律电导率，复阻抗和介电模量的框架内讨论了频率相关的电和介电数据。在室温下，交流电导率行为是CuFe_（1-x）Cr_xO_2粉末中电荷传输的特征。用Cr〜（3+）代替Fe〜（3+）会导致直流电导率的增加和Cu〜+ -Cu〜+距离的减小。直流电导率，特征起始频率和哈夫里亚克-涅加特性松弛时间在-40°C以上x = 0.835时被热激活。从直流和交流电导率以及阻抗和模量损失获得的相关活化能相似，表明CuFe _（1-x）Cr_xO_2铜铁矿粉末满足BNN关系。直流电和交流电导率具有相同的传输机制，分别是高于-40°C和低于-40°C的热激活最近邻居跳跃和隧道跳跃。

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