Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

Borkar, Hitesh; Tomar, Monika; Gupta, Vinay; Scott, J. F.; Kumar, Ashok

doi:10.1063/1.4931696

Cited by 42 publications

(16 citation statements)

References 33 publications

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“…The value of slope of the linear plots shown in Figure 3 decreases from 2 to 1.82 with increase in the number of layers from 2 to 6 layers and further increases to 2.20 for seven layer structure, indicating the trap charge assisted conduction mechanism in the BiFeO 3 /BaTiO 3 multilayer structures. Such linear variation in log J versus log E is compatible with the Simmons' modification of the Schottky Equation [23]. The usual Schottky equation assumes that the electron mean free path is longer as compared to the Schottky barrier width.…”

Section: Resultssupporting

confidence: 63%

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

et al. 2016

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Section: Resultssupporting

confidence: 63%

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

et al. 2016

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“…The poling was quite effective, which significantly reduced the enhancement of polarization under illumination; however, the effect was still significant since polarization increase remained at nearly 50-150 % under light, which indicates intrinsic contribution of electronic polarization. 39,40,41,42,43 These results also suggest that there is a possibilities that the shift current associated with asymmetry between valence and conduction band spatial distributions under illumination may also significantly affect the displacement current and overall polarization. 44 To further strengthen the claims for enhancement of polarization under illumination, a PUND (Positive Up and Negative Down) measurement has been carried out to determine the logic states for ferroelectric memory elements based on a series of five pulses.…”

Section: Polarization Displacement Current and Pund Studymentioning

confidence: 76%

Giant enhancement in ferroelectric polarization under illumination

Borkar

Rao

Tomar

et al. 2018

Materials Today Communications

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We report optical enhancement in polarization and dielectric constant near room temperature in Pb 0.6 Li 0.2 Bi 0.2 Zr 0.2 Ti 0.8 O 3 (PLBZT) electro-ceramics; these are doubly substituted members of the most important commercial ferroelectric PbZr 0.2 Ti 0.8 O 3 (PZT:20/80). Partial (40%) substitution of equal amounts of Li +1 and Bi +3 in PZT: 20/80 retains the PZT tetragonal structure with space group P4mm. Under illumination of white light and weak 405-nm nearultraviolet laser light (30 mW), an unexpectedly large (200-300%) change in polarization and displacement current was observed. Light also changes the dc conduction current density by one to two orders of magnitude with a large switchable open circuit voltage (V oc ~ 2 V) and short circuit current (J sc ~ 5x10 -8 A). The samples show a photo-current ON/OFF ratio of order 6:1 under illumination of weak light.

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“…There are several publications available on the effect of electrical poling on microstructure and functional properties of many perovskite ceramics regarding domain dynamics, domain switching, charge migration and grain boundary reduction [13,14]. Different types of electrical poling methods are usually employed to polarize the ferroelectric ceramics: poling below the coercive field, electromechanical poling, hightemperature poling, and short-and long-time duration poling [15][16][17]. Out of these, the most accepted poling procedure to obtain stable polarization and enhanced piezoelectric properties is by poling the sample near T C , below the coercive field, for a shorter time [12,18].…”

Section: Introductionmentioning

confidence: 99%

Structural transformations and physical properties of (1 − x) Na_0.5Bi_0.5TiO₃ − x BaTiO₃ solid solutions near a morphotropic phase boundary

Mohanty

Dam

Borkar

et al. 2018

J. Phys.: Condens. Matter

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Piezoelectric and other physical properties are significantly enhanced at (or near) a morphotropic phase boundary (MPB) in ferroelectrics. MPB materials have attracted significant attention owing to both fundamental physics as well as the possibility of wellregulated energy and information storage devices which are dominated by lead (Pb)-based materials. Here, we report the crystal structure, Raman spectra, dielectric constant and polarization near the MPB of lead free (1 − x) Na 0.5 Bi 0.5 TiO 3 − x BaTiO 3 (0.00 ⩽ x ⩽ 0.10) solid-solution, prepared by sol-gel auto combustion technique and sintered by microwave sintering technique. With the addition of BaTiO 3 into Na 0.5 Bi 0.5 TiO 3 , it induces a structural phase transition from R3c (a single phase) to R3c + P4mm (a dual phase) close to x = 0.06 and 0.07 and transform to a high symmetry tetragonal phase P4mm at higher compositions (x = 0.08 to 0.10) as evident from our x-ray Rietveld refinement and Raman spectroscopic results. We perform first-principles calculations based on density functional theory that confirm a structural transition from a rhombohedral to a tetragonal phase under increasing x. In the prepared solid solution, an anomalous enhancement of remnant polarization (2P 0 r ) was observed for x = 0.06 and 0.07, which has been explained based on the existence of the MPB. On the other hand, the value of coercive field E 0 C was found to be decreased linearly from x = 0.00 to 0.06; it is constant for higher compositions. Further details of the ferroelectric properties on the electric field poled samples have been studied and compared with the as-grown (unpoled) samples.

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Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

Cited by 42 publications

References 33 publications

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

Giant enhancement in ferroelectric polarization under illumination

Structural transformations and physical properties of (1 − x) Na_0.5Bi_0.5TiO₃ − x BaTiO₃ solid solutions near a morphotropic phase boundary

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Anomalous change in leakage and displacement currents after electrical poling on lead-free ferroelectric ceramics

Cited by 42 publications

References 33 publications

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO3/BaTiO3 multilayer structure

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO3/BaTiO3 multilayer structure

Giant enhancement in ferroelectric polarization under illumination

Structural transformations and physical properties of (1 − x) Na0.5Bi0.5TiO3 − x BaTiO3 solid solutions near a morphotropic phase boundary

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Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

Effect of insertion of low leakage polar layer on leakage current and multiferroic properties of BiFeO₃/BaTiO₃ multilayer structure

Structural transformations and physical properties of (1 − x) Na_0.5Bi_0.5TiO₃ − x BaTiO₃ solid solutions near a morphotropic phase boundary