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Modification of structural and dielectric properties of polycrystalline Gd-doped BFO–PZO

Journal of Advanced Dielectrics 2018年第5期8卷 1-21页

作者： Ambika Ray Banarji Behera Tanmoy Basuy saumitra vajandar Santosh Kumar Satpathy Pratibindhya Nayak Material Research Laboratory School of Physics Sambalpur UniversityJyoti Vihar BurlaOdisha 768019India Centre for Advanced 2D Materials National University of Singapore Singapore 117546Singapore Centre for Ion Beam Applications National University of Singapore Singapore 117542Singapore Department of Physics School of Applied Science Centurion University of Technology and Management BhubaneswarOdisha 752050India

(1-y)(BiFe_(1-x)GdxO_(3))–y(PbZrO3)composites(y=0:5),having four different Gd concentrations(x=0:05,0.1,0.15,and 0.2),were synthesized and their structural,dielectric,and ferroelectric properties have been studied using different characterization *** addition,to investigate the effect of ion implantation on the microstructure and dielectric properties,these composites were exposed to 2 MeV He+-*** of the structure,surface morphology and electrical properties of the samples before and after ion exposure were demonstrated using powder X-ray diffraction(XRD),scanning electron microscopy(SEM)technique,and LCR *** compositional analysis was carried out using energy dispersive X-ray spectrometry(EDS).XRD results demonstrated a decrease in the intensity profile of the dominant peak by a factor of 6 showing a degradation of the ***–Hall(WH)plots reveal reduction in the grain size after irradiation along with an increase in strain and dislocation density.A decrease in the dielectric constant and loss has been recorded after ion beam exposure with reduction in ac conductivity *** contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist *** the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon *** role of structural defects modifying the physical properties of the composite materials is discussed in this work.

关键词： Ion beam irradiation defects dielectric properties ferroelectricity.

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