Realizing high low-electric-field energy storage performance in AgNbO3 ceramics by introducing relaxor behaviour

Han, Kai; Luo, Nengneng; Mao, Shuaifei; Zhuo, Fangping; Chen, Xiyong; Liu, Laijun; Hu, Changzheng; Zhou, Huanfu; Wang, Xinpeng; Wei, Yuezhou

doi:10.1016/j.jmat.2019.07.006

Cited by 92 publications

(41 citation statements)

References 52 publications

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“…A more attractive energy storage density of 5.2 J cm −3 was reported in Ag 0.91 Sm 0.03 NbO 3 ceramics but with yet low efficiency of 68.5% 29 . It should be noted that the disorder feature can be induced by aliovalent ion dopant in AN system, which can be confirmed by the obvious frequency dispersion over M1-M2 phase transition and high diffuseness parameter 30 . This may be associated with the downward shifting of M2-M3 phase transition temperature with diffused dielectric maximum 31 , being generally ascribed to the different degrees of displacement orders in M2 and M3 phases 32 .…”

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confidence: 73%

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

et al. 2020

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Dielectric capacitors with high energy storage density (Wrec) and efficiency (η) are in great demand for high/pulsed power electronic systems, but the state-of-the-art lead-free dielectric materials are facing the challenge of increasing one parameter at the cost of the other. Herein, we report that high Wrec of 6.3 J cm-3 with η of 90% can be simultaneously achieved by constructing a room temperature M2–M3 phase boundary in (1-x)AgNbO3-xAgTaO3 solid solution system. The designed material exhibits high energy storage stability over a wide temperature range of 20–150 °C and excellent cycling reliability up to 106 cycles. All these merits achieved in the studied solid solution are attributed to the unique relaxor antiferroelectric features relevant to the local structure heterogeneity and antiferroelectric ordering, being confirmed by scanning transmission electron microscopy and synchrotron X-ray diffraction. This work provides a good paradigm for developing new lead-free dielectrics for high-power energy storage applications.

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confidence: 73%

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

et al. 2020

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“…By composition tuning and ion doping to provide the greatest probability for optimizing the energy storage performance. 13,14 AgNbO 3 is also adopted as a dopant in other antiferroelectric systems to taking advantage of its alkaline characteristics. 15,16 By introducing other elements such as Mn, W, Ta, Ca, and Sm into AgNbO 3 ceramics, the phase structure and dielectric behaviors of the matrix are modulated and further improve the energy storage performance.…”

Section: Introductionmentioning

confidence: 99%

“…Since silver niobate was successfully synthesized by Fu et al and the typical double hysteresis loop was observed, 12 extensive efforts have been paid to AgNbO 3 ‐based ceramics to determine the phase structure or improve its energy storage density. By composition tuning and ion doping to provide the greatest probability for optimizing the energy storage performance 13,14 . AgNbO 3 is also adopted as a dopant in other antiferroelectric systems to taking advantage of its alkaline characteristics 15,16 …”

Section: Introductionmentioning

confidence: 99%

Enhanced energy storage density in Ca and Ta co‐doped AgNbO₃ antiferroelectric ceramics

Chao

Yang

et al. 2020

J Am Ceram Soc

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Ca and Ta co-doped AgNbO 3 antiferroelectric lead-free ceramics were fabricated by rolling process technique, and improved energy storage properties were obtained. X-ray diffraction and Raman spectra indicate a single perovskite structure for (Ag 1-2x Ca x)(Nb 1-x Ta x)O 3 ceramics. The dielectric performances were also investigated, showing that increasing the content of Ca and Ta from 0.1 to 5 mol% gradually

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“…Both Sr and Ca dopants have been used experimentally to increase the energy storage property in AgNbO 3 . [35] Solution energies of other dopants are quite high because of their ionic radii deviating significantly from the ionic radius of Ag + . The highest solution energy is reported for Ba 2 + (5.85 eV).…”

Section: Divalent Dopantsmentioning

confidence: 99%

Structural, defect, transport and dopant properties of AgNbO₃

Kuganathan

Chroneos

2020

ChemNanoMat

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Silver niobate (AgNbO3) is a candidate lead‐free piezoelectric materials with potential applications in electronic technology and catalysis. Atomistic simulation techniques are used to examine the defects, diffusion of Ag+ and O2− ions, solution of dopants and electronic structures of pristine and doped configurations in AgNbO3. The Ag Frenkel is the most favourable intrinsic defect leading to the formation of Ag vacancies that can vehicle self‐diffusion of Ag+ ions in this material. The calculated activation energy for the diffusion of O2− ions (1.07 eV) is significantly lower than that calculated for the diffusion of Ag+ ions (2.44 eV). The prominent isovalent dopants on the Ag and the Nb sites are found to be Na+ and Ta5+ respectively. Doping of Ge on the Nb site can facilitate the formation of oxygen vacancies required for the oxygen diffusion. Additional Ag vacancies required for the self‐diffusion of silver can be introduced by doping of Ca on the Ag site. Electronic structures of non‐defective and defective AgNbO3 are discussed using density functional theory calculations.

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Realizing high low-electric-field energy storage performance in AgNbO3 ceramics by introducing relaxor behaviour

Cited by 92 publications

References 52 publications

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Enhanced energy storage density in Ca and Ta co‐doped AgNbO₃ antiferroelectric ceramics

Structural, defect, transport and dopant properties of AgNbO₃

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Realizing high low-electric-field energy storage performance in AgNbO3 ceramics by introducing relaxor behaviour

Cited by 92 publications

References 52 publications

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Constructing phase boundary in AgNbO3 antiferroelectrics: pathway simultaneously achieving high energy density and efficiency

Enhanced energy storage density in Ca and Ta co‐doped AgNbO3 antiferroelectric ceramics

Structural, defect, transport and dopant properties of AgNbO3

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Enhanced energy storage density in Ca and Ta co‐doped AgNbO₃ antiferroelectric ceramics

Structural, defect, transport and dopant properties of AgNbO₃