Dielectric, ferroelectric and impedance spectroscopic studies in TiO2-doped AgNbO3 ceramic

Muduli, Rakesh; Pattanayak, Ranjit; Raut, Subhajit; Sahu, P. K.; Senthil,; Rath, S.; Kumar, P.; Panigrahi, S.; Panda, Ranjit Kumar

doi:10.1016/j.jallcom.2015.12.259

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…where f max is the frequency corresponding to the maximum of Z ″, f 0 is pre‐exponential factor, k B is the Boltzmann constant, and T is the Kelvin temperature. The obtained E a is 1.36 eV for pure AN ceramic, approximate to the value reported in the literature, suggesting the migration of oxygen vacancies at high temperatures. After substitution of La 3+ , the E a increases to 1.52 eV, indicating higher energy is required for oxygen vacancy transportation.…”

Section: Resultssupporting

confidence: 86%

Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

et al. 2019

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Environmentally benign lead-free bulk ceramics with high recoverable energy density (W rec ) are very attractive in advanced pulsed power capacitors. In this work, composition engineering was adopted by La 3+ modification to improve the energy storage performance of Ag 1−3x La x NbO 3 ceramics. It was found that the antiferroelectric (AFE) phase was stabilized after La 3+ substitution, as a result of the reduced tolerance factor t. Significant improvement of W rec and energy storage efficiency (η) were achieved with value of 3.12 J/cm 3 and 0.63 for x = 0.02 at an electric field of 230 kV/cm, more than 1.5 times the value of pure AgNbO 3 (W rec = 1.9 J/cm 3 , η = 0.40). The excellent energy storage properties are resulted from the increased antiferroelectric-ferroelectric phase transition electric field (E F ), ferroelectric-antiferroelectric phase transition electric field (E A ), and breakdown electric field (E b ). The enhanced E b was ascribed to the decreased grain size and increased electrical resistivity upon La 3+ modification. The feature makes Ag 1−3x-La x NbO 3 a potential candidate for energy storage applications. K E Y W O R D Sdielectric materials/properties, energy storage, ferroelectricity/ferroelectric materials, lead-free ceramics

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Section: Resultssupporting

confidence: 86%

Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

et al. 2019

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“…Devesa et al 45 reported the highest real part of the permittivity value of more than 10 4 for AN at 300 K. Muduli 22 noted that doping with heterovalent Mn 4+ and W 6+ ions created compounds with high hole and electron content and that AN ceramics modified by these ions resulted in better dielectric properties. In another study on a TiO 2 -doped AgNbO 3 ceramic, 64 it was found that the presence of Ti 4+ , Ti 3+ and Ti 2+ states and carrier (hole) improves the dielectric properties. The tan δ of the ANF1 ceramic is 1.03 times the tan δ of the AN ceramic at 40 °C and increases to 34 times at T C .…”

Section: Resultsmentioning

confidence: 95%

“…Paper for AN at 300 K. Muduli 22 noted that doping with heterovalent Mn 4+ and W 6+ ions created compounds with high hole and electron content and that AN ceramics modified by these ions resulted in better dielectric properties. In another study on a TiO 2 -doped AgNbO 3 ceramic, 64 it was found that the presence of Ti 4+ , Ti 3+ and Ti…”

Section: Dalton Transactionsmentioning

confidence: 95%

“…The intrinsic loss stems from lattice vibrations and crystal structure. [62][63][64] In the (1 − x)AgNbO 3 -xFeNbO 4 ceramics, as the Fe 3+ content increased, the amount of grain boundaries, secondary phase, and porosity increased, and the shape of the grains changed, which resulted in an increase in dielectric loss, as shown in the dielectric characterization section.…”

Section: Papermentioning

confidence: 98%

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Dielectric, pyroelectric, and ferroelectric studies in (1 − x)AgNbO₃–xFeNbO₄ lead-free ceramics

Moradi,

Taheri-Nassaj,

Yourdkhani

et al. 2023

Dalton Trans.

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“…Silver niobate (AgNbO 3 ) is a perovskite material of n-type that possess visible light sensitivity. Structurally this AgNbO 3 has Ag + ions within the center of the NbO 6 octahedron [7]. The valence band maxima (VB max ) is constituted by the Ag-3d in the top and O-2p orbitals at the bottom.…”

Section: Introductionmentioning

confidence: 99%

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

Rani

Saravanan

2022

Photochem Photobiol Sci

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In the present study, the charge-carrier recombination of visible light active perovskite silver niobate (AgNbO 3 ) was reduced by forming heterojunction with Co 3 O 4 through simple impregnation and calcination route. The loading percentage of Co 3 O 4 was varied as 2, 5, and 10 wt.%. The XRD study revealed reduced interlayer spacing in the composite due to the replacement of the bigger Ag + ions by the smaller Co 2+ and Co 3+ ions of Co 3 O 4 . It was observed that the light harvesting efficiency of the materials was increased with increased loading of Co 3 O 4 . The TEM and XPS analysis confirmed the presence of Ag nanoparticles over the perovskite in the composite. The electrochemical analysis revealed enhanced charge-carrier number density and increased charge-carrier lifetime in the composite as a result of the presence of both silver and cobalt ions in the lattice. Further this enhanced charge-carrier separation of the composites was established through photocatalysis of Bisphenol-A under both solar and LED light. Charge-trapping study indicated *O 2 − and *OH as the major radicals involved and Z-scheme as the predominant charge transfer pathway for generation of these reactive oxygen species.

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Dielectric, ferroelectric and impedance spectroscopic studies in TiO2-doped AgNbO3 ceramic

Cited by 19 publications

References 42 publications

Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

Dielectric, pyroelectric, and ferroelectric studies in (1 − x)AgNbO₃–xFeNbO₄ lead-free ceramics

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

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Dielectric, ferroelectric and impedance spectroscopic studies in TiO2-doped AgNbO3 ceramic

Cited by 19 publications

References 42 publications

Lead‐free Ag1−3xLaxNbO3 antiferroelectric ceramics with high‐energy storage density and efficiency

Lead‐free Ag1−3xLaxNbO3 antiferroelectric ceramics with high‐energy storage density and efficiency

Dielectric, pyroelectric, and ferroelectric studies in (1 − x)AgNbO3–xFeNbO4 lead-free ceramics

Heterojunction formation between AgNbO3 and Co3O4 for full solar light utilization with improved charge-carrier separation

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Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

Lead‐free Ag_1−3xLa_xNbO₃ antiferroelectric ceramics with high‐energy storage density and efficiency

Dielectric, pyroelectric, and ferroelectric studies in (1 − x)AgNbO₃–xFeNbO₄ lead-free ceramics