Investigation of space charge polarization behavior in Pb0.9Bi0.1Fe0.7W0.3O3 ceramic

Shivaraja, I.; Matteppanavar, Shidaling; Deshpande, S. K.; Rayaprol, Sudhindra; Angadi, Basavaraj

doi:10.1016/j.jallcom.2019.06.010

Cited by 15 publications

(12 citation statements)

References 28 publications

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“…shows surface morphology and the elemental stoichiometry of the (1−x)Pb(Fe 2/3 W 1/3 )O 3 -(x)BiFeO 3 (x = 0.1 and x = 0.4) solid solutions obtained from the scanning electron microscopy (SEM) on small chunks of the samples. It reveals the uniformly distributed grains with an average grain size of about 1-2 μm [24]. The inset shows the histograms of grain sizes and it confirms the synthesized materials are bulk in size with high quality of crystallanity.…”

Section: Sem and Edax Studies Figures 3(a) And (B)mentioning

confidence: 52%

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution

Shivaraja

Matteppanavar²,

Krishna³

et al. 2020

J. Phys.: Condens. Matter

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Section: Sem and Edax Studies Figures 3(a) And (B)mentioning

confidence: 52%

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution

Shivaraja

Matteppanavar²,

Krishna³

et al. 2020

J. Phys.: Condens. Matter

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“…The activation energy of 381 meV for MBI (figure S2(a)) and 410 meV for FBI (figure S2(b)) crystals were obtained from the fitting, and also thermally dependent relaxation is confirmed, which is also confirmed later from the DC conductivity graph. This typical value of activation energy reveals the ionic hopping of mobile ions between lattice sites and that the space charge originates from the thermal ionization of halide vacancies [52]. This activation energy of FBI is also higher than all inorganic CsSnCl 3 or CsCuCl 3 perovskite, which ensures less noise in high external bias and better device stability [30,31].…”

Section: Resultsmentioning

confidence: 90%

Temperature-activated dielectric relaxation in lead-free halide perovskite single crystals

Paul¹,

Tailor²,

Mahapatra³

et al. 2022

J. Phys. D: Appl. Phys.

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Lead-free metal-halide perovskites have recently appeared as a promising candidate in optoelectronics and photovoltaics because of their non-toxicity, stability, and unique photophysical properties. Much scientific research has been done on optoelectronic characteristics and photovoltaic applications of lead-free perovskites, but the dielectric characteristics and insight into the relaxation phenomenon remain elusive. Here, we study the dielectric relaxation and conduction mechanism in the single crystalline (SC) A3Bi2X9 (A = MA+/FA+) perovskite using temperature-dependent electrochemical impedance spectroscopy in correlation with the modulus spectroscopy. With increasing temperature, the peak of −Z″(ω) shifts toward a high-frequency regime which specifies the thermally dependent relaxation mechanism in both crystals. The activation energy was estimated as 381 meV for MA3Bi2I9 (MBI) crystal and 410 meV for the FA3Bi2I9 (FBI) crystal suggesting hopping of mobile ions between lattice sites. The connected orientational polarization with the thermal motion of molecules leads to the enhancement in the dielectric constant (ϵ′) with temperature. The ϵ″(ω) in these crystals shows the significant ionic conductivity with a typical 1/fγ type characteristics (in the low-frequency regime) where γ is found to be in the range of 0.93–1.0 for MBI crystal and 0.88–0.98 for FBI crystal. The correlated imaginary part of impedance (−Z″) and modulus (M″) demonstrate the temperature-activated delocalized relaxation (non-Debye toward the Debye type) in these crystals. Stevels model suggests that the contribution of traps reduces with temperature rise and therefore conductivity enhances. Our study provides a comprehensive analysis and in-depth knowledge about the dielectric and conductivity relaxation mechanism in these lead-free perovskite SCs, which will help to implement efficient energy storage devices using these materials.

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“…However, the reduced Hc may be attributed to decay in the anisotropy field, which often leads to a decrease in domain wall energy and is related to the effects of crystallite size. Using the values of Ms and Hc, the anisotropic constant (Kc) can be estimated, [22] indicating decay with the addition of Cr concentration. To substantiate the aforementioned explanation, we conducted calculations to determine the magnetic moment per formula unit, expressed in terms of Bohr.…”

Section: Resultsmentioning

confidence: 99%

“…All precursors were accurately weighed according to the stoichiometric ratio and then dissolved in 80 ml of deionized water. The detailed synthesis procedure can be found in Elsevier's publication [22] . Subsequently, all samples were individually heated at 200 °C for 5 hours in a muffle furnace and allowed to cool down to RT.…”

Section: Methodsmentioning

confidence: 99%

Magnetic, Electric, and Antimicrobial Properties of Chromium‐ Doped Cobalt Zinc Ferrite Nanoplates

Badiger,

Hegde,

Kumbar

et al. 2024

ChemistrySelect

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In the present work, Co0.5Zn0.5CrxFe2‐xO4 (CZFCO) (x=0.0, 0.1, 0.2, 0.3, 0.4, and 0.5) has been successfully driven from self‐ignited sol‐gel method, using citric acid as a chelating agent. The powder XRD patterns are confirming the formation of single‐phase cubic crystallographic structure with satisfying the Fd‐3m space group. The Rietveld refinement process is carried out to obtain the structural information, including lattice parameters, cell volume, and bond length. Crystallite size and micro‐strain values are found by the Debye Scherrer formula as well as by HR‐TEM the particle size is shown at about 7.86 nm and the presence of two distinct lattice fringes. The SEM digital images display soft wart grains nature, where the majority of grains are forming a dense agglomerate nature with nano plate texture. EDS spectra reflect the presence of all the elements without impurities. The formations of spinel ferrite and metal‐oxygen bond were approbated by FT‐IR Spectra. Further, RT UV‐Vis spectra (DRS) show a decrease in the optical band gap from 1.56 eV to 1.46 eV. The magnetic properties indicate soft ferromagnetic behaviour and as increasing Cr dopant saturation magnetization and coercivity significantly decrease while in the case of X=0.5 suddenly enhanced the Ms, this well corroborates with cation distribution. X‐ray photoelectron spectroscopy (XPS) technique has confirmed the presence of all elements and shows the valance of the Cr is +3 and +2 states at respected octahedral and tetrahedral sites. RT dielectric studies firmly agreed with the Maxwell‐Wagner type of polarization following Koop's theory. RT Impedance spectra suggest consent of the Debye type of relaxation and the Cole‐Cole map shows semi arc‐shaped curve fitted with Gaussian distribution. The imaginary and real parts of the relative permeability of frequency‐dependent curves decayed and firmly showed the favourable character of electric properties. Finally, all the antimicrobial activity results suggested the potential utility of derived compounds as antibacterial agents.

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Investigation of space charge polarization behavior in Pb0.9Bi0.1Fe0.7W0.3O3 ceramic

Cited by 15 publications

References 28 publications

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution

Temperature-activated dielectric relaxation in lead-free halide perovskite single crystals

Magnetic, Electric, and Antimicrobial Properties of Chromium‐ Doped Cobalt Zinc Ferrite Nanoplates

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Investigation of space charge polarization behavior in Pb0.9Bi0.1Fe0.7W0.3O3 ceramic

Cited by 15 publications

References 28 publications

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe2/3W1/3)O3–(x)BiFeO3(x= 0.1 and 0.4) solid solution

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe2/3W1/3)O3–(x)BiFeO3(x= 0.1 and 0.4) solid solution

Temperature-activated dielectric relaxation in lead-free halide perovskite single crystals

Magnetic, Electric, and Antimicrobial Properties of Chromium‐ Doped Cobalt Zinc Ferrite Nanoplates

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Product

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Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution

Weak ferromagnetism and magnetoelectric coupling through the spin–lattice coupling in (1−x)Pb(Fe_2/3W_1/3)O₃–(x)BiFeO₃(x= 0.1 and 0.4) solid solution