Density of states and impedance behaviour of transition metal substituted SrBi2Nb2O9 ferroelectric nanoceramics prepared by chemical process
作者： Mrinal K. Adak , Debasis Dhak
DOI: 10.1007/S10854-017-6481-X
关键词: Thermodynamics 、 Ferroelectricity 、 Binding energy 、 Relaxation (physics) 、 Materials science 、 Density of states 、 Ferroelectric ceramics 、 Activation energy 、 Atmospheric temperature range 、 Perovskite (structure) 、 Condensed matter physics
摘要: Nanocrystalline layered perovskite Sr0.5A0.5Bi2Nb2O9 (A = Co2+, Ni2+, Cu2+) ferroelectric ceramics were synthesized through chemical process. The compounds found to have tolerance values 0.90, 0.865 and 0.872 which are well within its limit. electrical behaviour was thoroughly studied impedance analysis the temperature range between 400 °C 500 °C after sintering pressed pellet at 750 °C for 4h. Strong relaxation Sr0.5Co0.5Bi2Nb2O9 Sr0.5Cu0.5Bi2Nb2O9. ac activation energy calculated from behaviour. All samples showed grain conductivity only. binding density of states with respect frequency. hopping also established a correlated barrier model.
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