Estimation of relaxor behavior in Sr2+ doped Na0.5Bi0.5TiO3 ceramics

Praharaj, Swetapadma; Rout, Dibyaranjan

doi:10.1007/s10854-020-03120-4

Cited by 6 publications

(1 citation statement)

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“…This phenomenon was due to the fact that space charges were more easily excited at high temperatures and tended to migrate under high-temperature conditions. Space charge had more energy to cross the energy barrier at high temperatures, so the semicircular arc of impedance became smaller with increasing temperature. − This observation corresponds to a typical characteristic of the relaxation pattern. The inset of Figure shows the normalization of the imaginary part of the impedance.…”

Section: Resultsmentioning

confidence: 87%

Energy Storage and Charge/Discharge Performance of Sm-Doped NBT-Based Lead-Free Ceramics

Zhao,

Zhang,

et al. 2023

ACS Appl. Electron. Mater.

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(Na0.5Bi0.5)0.75Sr0.25TiO3–x Sm2O3 ceramics (denoted as NBSTS x ) were obtained by the solid-state reaction method, and their crystal structure and morphological characteristics were characterized by X-ray diffractometer mapping (XRD) and scanning electron microscopy (SEM). The NBSTS x ceramics, when doped with a concentration of x = 0.03, demonstrated outstanding performance in terms of maximum recoverable energy storage density (W rec ∼ 3.35 J/cm3) and energy storage efficiency (η ∼ 84.8%). This ceramic exhibited the highest potential at an electric field strength of 210 kV/cm. Additionally, the thermal stability of NBSTS0.03 ceramic remained constant within the temperature range of 30–90 °C, while their frequency stability covered the range of 10–1000 Hz. By analyzing the dielectric spectra of the material, we investigated the variation of the relative permittivity (εr ) and the dielectric loss angle tangent (tan δ), and we probed the relaxation behavior by means of a modified Curie–Weiss law. The NBSTS x ceramic with a density of x = 0.03 exhibited a fast charge/discharge rate of 128 ns and a discharge energy density of 1.06 J/cm3. From the impedance spectra, the relaxation phenomena observed in the system could potentially be attributed to the migration of oxygen vacancies.

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Section: Resultsmentioning

confidence: 87%