Single-phase formation mechanism and dielectric properties of sol-gel-derived Ba(Ti0.2Zr0.2Sn0.2Hf0.2Ce0.2)O3 high-entropy ceramics

Liu, Jia; Ma, Cuiying; Wang, Lianli; Ren, Ke; Ran, Hongpei; Feng, Danni; Du, Huiling; Wang, Yiguang

doi:10.1016/j.jmst.2022.05.012

Cited by 36 publications

(3 citation statements)

References 46 publications

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“…Since the initial report by Rost et al, various studies of HEOs have been conducted. In the majority of these, the solid-state or sol–gel methods have been used as the synthetic method. − The synthesis of HEMs is often performed under high-temperature conditions to leverage the large configurational entropy, which leads to larger particle sizes by the sintering process. Accordingly, the majority of the fabricated HEOs are in bulk size; in contrast, the production of HEO NPs first reported in 2019 remains limited.…”

Section: Introductionmentioning

confidence: 99%

Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

Hanabata,

Kusada,

Yamamoto

et al. 2023

J. Am. Chem. Soc.

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High-entropy oxide nanoparticles (HEO NPs) have been intensively studied because of their attractive properties, such as high stability and enhanced catalytic activity. In this work, for the first time, denary HEO NPs were successfully synthesized using a continuous supercritical hydrothermal flow process without calcination. Interestingly, this process allows the formation of HEO NPs on the order of seconds at a relatively lower temperature. The synthesized HEO NPs contained 10 metal elements,

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Section: Introductionmentioning

confidence: 99%

Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

Hanabata,

Kusada,

Yamamoto

et al. 2023

J. Am. Chem. Soc.

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“…For t > 1, a tetragonal structure is stable, for 0.9 < t < 1, a cubic structure is stable, and for 0.71 < t < 0.9, orthorhombic/rhombohedral structures are stable [1]. Stable high-entropy perovskite oxide compositions have been documented for the A-site [32][33][34][35][36][37][38][39][40][41][42][43][44], B-site [45][46][47][48], and both cation sites [49][50][51][52][53][54]. However, these studies do not consider charge balancing or compensation when heterovalent cations are mixed.…”

Section: Introductionmentioning

confidence: 99%

High-Entropy Lead-Free Perovskite Bi0.2K0.2Ba0.2Sr0.2Ca0.2TiO3 Powders and Related Ceramics: Synthesis, Processing, and Electrical Properties

Surdu,

Marinică,

Pătru

et al. 2023

Nanomaterials

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A novel high-entropy perovskite powder with the composition Bi0.2K0.2Ba0.2Sr0.2Ca0.2TiO3 was successfully synthesized using a modified Pechini method. The precursor powder underwent characterization through Fourier Transform Infrared Spectroscopy and thermal analysis. The resultant Bi0.2K0.2Ba0.2Sr0.2Ca0.2TiO3 powder, obtained post-calcination at 900 °C, was further examined using a variety of techniques including X-ray diffraction, Raman spectroscopy, X-ray fluorescence, scanning electron microscopy, and transmission electron microscopy. Ceramic samples were fabricated by conventional sintering at various temperatures (900, 950, and 1000 °C). The structure, microstructure, and dielectric properties of these ceramics were subsequently analyzed and discussed. The ceramics exhibited a two-phase composition comprising cubic and tetragonal perovskites. The grain size was observed to increase from 35 to 50 nm, contingent on the sintering temperature. All ceramic samples demonstrated relaxor behavior with a dielectric maximum that became more flattened and shifted towards lower temperatures as the grain size decreased.

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“…Among various electrical energy storage devices, dielectric capacitors have attracted great interest due to their highpower density and extremely high charge-discharge speed. [1][2][3][4][5] However, their low energy density limits their applications. The recoverable energy storage density (W rec ) of dielectric capacitors can be calculated by the following formula: W rec = Edp, P P r max ∫ where P max and P r are the saturation polarization and remnant polarization, respectively.…”

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confidence: 99%

Effect of Chemical Inhomogeneity on the Dielectric and Impedance Behaviors of Bismuth Sodium Titanate Based Relaxors

Li¹,

Rao²,

Wang³

et al. 2023

ECS J. Solid State Sci. Technol.

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Different levels of Nb2O5 substitution in 0.66(Bi0.5Na0.5)TiO3-0.06BaTiO3-0.28(Bi0.2Sr0.7)TiO3 (BS-xNb) lead-free relaxors were prepared to investigate the effect of chemical heterogeneity on the dielectric and impedance behaviors. X-ray diffraction reveals that the secondary phase gradually increases in number and intensity as the dopant increases. The substitution of less Nb5+ for Ti4+ leads to reduced electronic conductivity and dielectric loss, which is attributed to the inhibition of oxygen vacancies and associated electron. It is found that more valence electron defects are generated to cause charge leakage by introducing excess Nb2O5. Moreover, the addition of Nb2O5 doping enhances the disorder and facilitates the transition of the nonergodic to ergodic relaxor phase. The ferroelectric ergodic long-range order is further disrupted and promotes the formation of local defect fields and high-temperature polar nanoregions. These effects enhance the relaxation behavior with decreased remnant polarization and form a broadly flat dielectric platform. Meanwhile, BS-2Nb exhibits attractively high recoverable energy storage density and efficiency at a relatively low electric field with stability against frequency and temperature. Combined with the complex impedance characteristics, the leakage contribution of the chemical inhomogeneity introduced by excess Nb2O5 is presented, demonstrating the significance of regulating the dielectric performance of bismuth sodium titanate-based relaxors.

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Single-phase formation mechanism and dielectric properties of sol-gel-derived Ba(Ti0.2Zr0.2Sn0.2Hf0.2Ce0.2)O3 high-entropy ceramics

Cited by 36 publications

References 46 publications

Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

Denary High-Entropy Oxide Nanoparticles Synthesized by a Continuous Supercritical Hydrothermal Flow Process

High-Entropy Lead-Free Perovskite Bi0.2K0.2Ba0.2Sr0.2Ca0.2TiO3 Powders and Related Ceramics: Synthesis, Processing, and Electrical Properties

Effect of Chemical Inhomogeneity on the Dielectric and Impedance Behaviors of Bismuth Sodium Titanate Based Relaxors

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