Dielectric relaxation and scaling of AC conductivity observed in mixed valence perovskite Eu_(2)CoMnO_(6)  

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作  者:Md.G.Masud B.K.Chaudhuri 

机构地区:[1]Department of Physics,Basanti Devi College,147B Rash Behari Avenue,Kolkata 700029,India [2]Center for Rural and Cryogenic Technologies,Jadavpur University,Kolkata 700032,India [3]Formerly at Solid State Physics Department,Indian Association for the Cultivation of Science Kolkata 700032,India

出  处:《Journal of Advanced Dielectrics》2021年第6期52-58,共7页先进电介质学报(英文)

摘  要:Monophasic and polycrystalline double perovskite Eu_(2)CoMnO_(6)has been synthesized,and its structural characterization,fre-quency and temperature-dependent dielectric relaxation have been studied.Observed thermally activated dielectric relaxation was explained using the empirical Havriliak-Negami(HN)dielectric relaxation function with an estimated activation energy E~0.22 eV and attempt frequency f0~2.46×10^(9)Hz.The frequency-dependent AC conductivity data,over a wide range of tempera-ture(100-325 K),followed the empirical universal power law behavior(~f n,n is the constant exponent)showing two different frequency exponents,respectively,in the high-and low-temperature regions.The high-temperature(>275 K)conductivity data followed the continuous time random walk(CTRW)approximation model proposed by Dyre.However,this model failed to repro-duce the observed conductivity spectra in the low-temperature side(<200 K).Interestingly,both the high-and low-temperatures’conductivity data can be scaled to the master curve with suitably chosen scaling parameters.

关 键 词:Dielectric relaxation AC conductivity SCALING PEROVSKITE 

分 类 号:TB3[一般工业技术—材料科学与工程]

 

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