Relaxation processes and conduction mechanism in bismuth ferrite lead titanate composites

Sahu, Truptimayee; Behera, Banarji

doi:10.1016/j.jpcs.2017.10.021

Cited by 22 publications

(8 citation statements)

References 26 publications

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“…12). 60 These studies clearly show the contribution of grain and GBs in conduction mechanism and have been recently shown by Wang et al in doped BaTiO 3based ceramics. 43,61 3.6.…”

Section: Nyquist Plotsupporting

confidence: 70%

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

et al. 2018

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[Formula: see text](BiFe[Formula: see text]GdxO3)–y(PbZrO3) composites [Formula: see text], having four different Gd concentrations ([Formula: see text], 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 2[Formula: see text]MeV He[Formula: see text]-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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“…12). 60 These studies clearly show the contribution of grain and GBs in conduction mechanism and have been recently shown by Wang et al in doped BaTiO 3based ceramics. 43,61 3.6.…”

Section: Nyquist Plotsupporting

confidence: 70%

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

et al. 2018

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“…In fig. [2](a), we find this behaviour for a RRTN sample with L = 80, p = 0.4 under an external voltage V = 10. The (iteration) time since which the total number of t-bonds saturates to a constant value is newly termed here as τ t .…”

Section: On Search For the Time-scale During Relaxationmentioning

confidence: 53%

“…By I steady , we mean the bulk current value of the corresponding RRTN when it becomes steady. Interestingly by comparing the figures [2](a) and [2](b), we find that the appearance of the exponential tail in the relaxation and the saturation in the total number of t-bonds are almost simultaneous. So the time τ t can be identified as a phenomenological time-scale, present in the RRTN dynamics.…”

Section: On Search For the Time-scale During Relaxationmentioning

confidence: 98%

“…For the sample shown in the fig. [2](a), it is ∼ 5 × 10 4 in unit of arbitrary iteration time. For a quantitative estimate of τ t in a particular RRTN sample, we measure N t (t) for every iteration-time t and compare this between two consecutive iterations.…”

Section: On Search For the Time-scale During Relaxationmentioning

confidence: 99%

“…Relaxation phenomena in binary composite materials, which are made of two components with widely different generalized susceptibilities, draw considerable interest among the scientists and engineers, even in very recent research activities [1,2,3]. The susceptibility (being a measure of the response of a system to an appropriate external field) is approximately treated as linear upto a sufficiently small field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Estimate of time-scale for the current relaxation of percolative Random Resistor cum Tunnelling Network model

Bhattacharya¹

2019

Physica A: Statistical Mechanics and its Applications

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The Random Resistor cum Tunneling Network (RRTN) model was proposed from our group by considering an extra phenomenological (semi-classical) tunneling process into a classical RRN bond percolation model. We earlier reported about early-stage two inverse power-laws, followed by large time purely exponential tail in some of the RRTN macroscopic current relaxations. In this paper, we investigate on the broader perspective of current relaxation. We present here an analytical argument behind the strong convergence (irrespective of initial voltage configuration) of the bulk current towards its steady-state, mapping the problem into a special kind of Gauss-Seidel method. We find two phenomenological time-scales (referred as τ t and τ s ), those emerge from the variation of macroscopic quantities during current dynamics. We show that not both, only one of them is independent. Thus there exists a single scale in time which controls the entire dynamics.

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Dielectric and electrical study along with the evidences of small polaron tunnelling in Gd doped bismuth ferrite lead titanate composites

Sahu

Behera

2018

J Mater Sci: Mater Electron

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Relaxation processes and conduction mechanism in bismuth ferrite lead titanate composites

Cited by 22 publications

References 26 publications

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

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

Estimate of time-scale for the current relaxation of percolative Random Resistor cum Tunnelling Network model

Dielectric and electrical study along with the evidences of small polaron tunnelling in Gd doped bismuth ferrite lead titanate composites

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