Electrical conductivity and impedance spectroscopy studies of cerium based aeschynite type semiconducting oxides: CeTiMO6 (M=Nb or Ta)

作者: S. Sumi , P. Prabhakar Rao , M. Deepa , Peter Koshy

DOI: 10.1063/1.3481389

关键词: CeramicDielectric spectroscopyCondensed matter physicsGrain boundaryTemperature coefficientElectrical resistivity and conductivityConductivityMaterials scienceThermal conductionAtmospheric temperature range

摘要: Complex ceramic oxides, CeTiMO6 (M=Nb or Ta) having aeschynite type mineral structure were prepared by the conventional route. impedance analysis in frequency range 10 Hz–1 MHz over a wide temperature (30–600 °C) indicates presence of grain boundary effect along with bulk contribution and also confirms non-Debye multiple relaxations material. The dependent conductivity plots exhibit double power law dependence suggesting three types conduction mechanisms: low (10 kHz) owing to long translational motion electrons (frequency independent), mid-frequency (1–10 due short-range hopping, high kHz–1 MHz) localized orientation hopping mechanism. model can explain nature mechanism completely. electrical measurements suggest negative coefficient resistance behav...

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