Temperature‐insensitive strain behavior in 0.99[(1−x)Bi0.5(Na0.80K0.20)0.5TiO3−xBiFeO3]–0.01Ta lead‐free piezoelectric ceramics

Yu, Jing-Ru; Chu, Shanshan; Song, Xianmeng; Gao, Han; Pan, Junchen; Hao, Jigong

doi:10.1111/ijac.12681

Cited by 9 publications

(3 citation statements)

References 27 publications

(69 reference statements)

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“…This enhanced performance is attributed to phase transitions between the ergodic relaxor phases in the form of mixed R 3 c and P 4 bm domains and the ferroelectric R 3 c phase in the form of lamellar domains. Some approaches related to donor doping were proposed to modify the piezoelectric performance of BNT systems, such as Ta 5+ :BNT-BiFeO 3 , Bi 3+ :BNT-Ba(ZrTi)O 3 –SrTiO 3 , Ta 5+ :(BiNaKLi)TiO 3 –SrTiO 3 , and so on . Complex dopants, for example, (Zn 1/3 Nb 2/3 ) 4+ , are reported to be positive for the piezoelectric properties of BNT–BaTiO 3 ceramics .…”

Section: Performance Tuning Via Defectmentioning

confidence: 99%

Defects and Aliovalent Doping Engineering in Electroceramics

et al. 2020

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Since the positive influences of defects on the performance of electroceramics were discovered, investigations concerning on defects and aliovalent doping routes have grown rapidly in the fields of inorganic chemistry and condensed matter physics. In this article, we summarized the types of defects in electroceramics as well as characterization tools of defects and highlighted the effects of intrinsic and extrinsic defects on the material performances with the emphasis on dielectric, ferroelectric, and piezoelectric properties. We mainly introduced defect related theoretical simulation and experimental results in several typical incipient ferroelectrics, ferroelectrics, and antiferroelectrics. Hence, the influences of defects on the crystal lattice were summed up, and then the main physical mechanisms were highlighted. Particularly, the performance enhancements of aliovalently doped electroceramics were also evaluated and reviewed. Finally, the outlook and challenges were discussed on the basis of their current developments. This article covers not only an overview of the state-of-the-art advances of defects and aliovalent doping routes in electroceramics but also the future prospects that may open another window to tune the electrical performance of electroceramics via intentionally introducing certain defects.

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Section: Performance Tuning Via Defectmentioning

confidence: 99%

Defects and Aliovalent Doping Engineering in Electroceramics

et al. 2020

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“…Ferroelectric materials are one of the hot research materials in condensed matter physics due to their unique crystal structure and are of longstanding interest to researchers in applications such as piezoelectric sensors, [1][2][3] dielectric capacitors, 4,5 photocatalysis 6,7 and memory. 8 Recently, perovskite oxide ferroelectric materials show potential advantages for photovoltaic applications due to their anomalous photo-induced voltage [9][10][11][12] under the illu-mination of light, which have attracted the interest of researchers.…”

Section: Introductionmentioning

confidence: 99%

Effect of defect‐induced bandgap intermediate states on the photovoltaic performance of KN‐based ferroelectric ceramics

Deng

Meng

et al. 2023

Int J Applied Ceramic Tech

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The inversion asymmetry of polar crystals enables ferroelectric ceramics to possess unique physical properties, among which the anomalous photovoltaic effect drives their potential application in photovoltaic conversion. Semiconducting (1−x) KNbO3−xBaNi.5Hf.5O3−δ (KNBNH, x = 2, 4, 6, 8%) ferroelectric ceramics with enhanced photovoltaic performance were prepared by utilizing conventional solid‐state sintering strategies. In these ceramics, the defect‐induced bandgap intermediate state is derived from the 3d split state of Ni and plays a dominant role in lowering the bandgap of KN. The defective bandgap state induced by Ni in KNBNH promotes its absorption of light and the separation of photogenerated carriers, thus enhancing its photovoltaic response. The KNBNH6 shows a maximum value of 138.7 nA/cm2 for short‐circuit photocurrent density (Jsc) among these ceramics, which is further enhanced to 702.9 nA/cm2 after 30 kV/cm polarization. Structural investigations after polarization indicate that polarization induced lattice distortion in KNBNH6, leading to an increase in the polarity of its cells. This work provides an understanding of defect‐induced bandgap states and high‐field polarization to enhance ferroelectric photovoltaic properties.

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“…Recent studies have focused on energy harvesting and energy conversion. Ferroelectric materials, which lack bulk inversion symmetry and have spontaneous polarizability, have many applications in fields such as piezoelectric transducers, 1,2 photovoltaic converters, 3,4 and photocatalysis 5–7 . Conventional photovoltaic devices imprisoned in the semiconductor energy band have a limited photogenerated voltage, 8 which is not sufficient for increasing the photovoltaic conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhanced photovoltaic performance via polarization in Bi/Co co‐doped KN‐based ferroelectric ceramics

Gao

Meng

et al. 2022

Int J Applied Ceramic Tech

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A bandgap-tunable KNbO 3 ferroelectric ceramic was prepared by introducing Bi/Co ion. The existence of mixed valence states of Co 2+ /Co 3+ in the system induced the bandgap reduction and its tunable behavior. KNbO 3 -BiCoO 3 solid solutions showed a typical orthogonal perovskite structure and maintained good ferroelectricity (P s = 15.13 µC/cm 2 ) and high-field polarization ability. The devices based on the .98KNbO 3 -.02BiCoO 3 sample exhibited an improved shortcircuit photocurrent density (J sc ) of 19.2 nA/cm 2 under simulated solar radiation, and this was further enhanced to 79.8 nA/cm 2 after a 60-kV/cm polarizing. The structural analysis of the samples after polarization reveals the effect of ferroelectric polarization on photovoltaic performance. This work provides new insights into the effects of ferroelectric polarization on photovoltaic performance.

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Temperature‐insensitive strain behavior in 0.99[(1−x)Bi_0.5(Na_0.80K_0.20)_0.5TiO₃−xBiFeO₃]–0.01Ta lead‐free piezoelectric ceramics

Cited by 9 publications

References 27 publications

Defects and Aliovalent Doping Engineering in Electroceramics

Defects and Aliovalent Doping Engineering in Electroceramics

Effect of defect‐induced bandgap intermediate states on the photovoltaic performance of KN‐based ferroelectric ceramics

Enhanced photovoltaic performance via polarization in Bi/Co co‐doped KN‐based ferroelectric ceramics

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