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

Autor: Ambika Ray, Banarji Behera, Tanmoy Basu, Saumitra Vajandar, Santosh Kumar Satpathy, Pratibindhya Nayak
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Journal of Advanced Dielectrics, Vol 8, Iss 5, Pp 1850031-1-1850031-21 (2018)
Druh dokumentu: article
ISSN: 2010-135X
2010-1368
2010135X
DOI: 10.1142/S2010135X18500315
Popis: (1−y)(BiFe1−xGdxO3)–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 techniques. In addition, to investigate the effect of ion implantation on the microstructure and dielectric properties, these composites were exposed to 2MeV He+-ions. Modifications 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 meter. The 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 crystallinity. Willliamson–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 value. The contribution of grain and grain boundary effect in conduction mechanism has been addressed using Nyquist plots. All the samples demonstrate a lossy ferroelectric loop which shows a clear modification upon irradiation. The role of structural defects modifying the physical properties of the composite materials is discussed in this work.
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