Hopping conduction of localized polarons with scaling behaviour in ceramic composite (YCrO3)1 - x - (CoFe1.6Cr0.4O4)x

Souvick Das,Sukhendu Sadhukhan,Ayan Mitra,Chandi Charan Dey,P.K. Chakrabarti

Materials Science and Engineering: B（2023）

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摘要

•(YCrO3)1 - x- (CoFe1.6Cr0.4O4)x has been prepared via two-step method with no impurity peaks.•Formation of percolated network confirmed from the EDAX mapping of the samples.•The hopping range (R) of 3 – 6 nm suggests small polarons in the YCO - CFCO.•Scaling behaviour of conductivity plots showed temperature independent relaxation mechanism of ceramic composites.•Grain boundary resistances at fc showed transformation from insulating to a conducting phase.

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关键词

X-ray diffraction, McLachlan model, VHR model, Activation energy of VRH, Fermi level, Hopping radius, Polaron, Nyquist fitting

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