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Structural analysis and dielectric characterization of Aurivillius type CaSrBi2Nb2O9 ceramics

Satish Khasa, Paramjeet Singh, Sujata Sanghi, Navneet Singh, Ashish Agarwal

Abstract


This work describes synthesis of powdered materials belonging to the Aurivillius oxide family (Bi2O2)2+(An-1BnO3n+1)2- for n = 2 and provides an approach for understanding the structural evolution with composition. The effect of strontium doping on the lattice response and dielectric properties of Ca1-xSrxBi2Nb2O9 (x = 0.0, 0.5, 1.0) ferroelectric ceramics is studied. The XRD studies revealed single phase formation of orthorhombic structure. The average crystallite size was obtained in the range 22-41 nm. The dielectric properties, viz. dielectric constant, loss tangent and ac electrical conductivity of the samples were studied by using impedance spectroscopy. A strong low frequency dielectric dispersion was found to exist in these samples. Its occurrence was ascribed to the presence of ionized space charge carriers such as oxygen vacancies. The relationship among doping, crystal structure, and dielectric properties were also discussed. Measurements of the dielectric permittivity as a function of temperature reveal signs of single phase transition. The thermal activation energy for the grain electric conductivity was lower in the high temperature region (Ea(ht) = 0.08 eV) and higher in the low temperature region (Ea(lt) = 0.21 eV).


Keywords


Aurivillius oxide; impedance spectroscopy; electrical conductivity; solid-state reaction;

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