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627 results on '"Chao Xiaolian"'

179. Ultra-fast charge-discharge and high-energy storage performance realized in K0.5Na0.5NbO3-Bi(Mn0.5Ni0.5)O3 ceramics.

Author

Nie, Xinru, He, Yan, Shi, Qiangqiang, Liang, Yuqian, Wei, Lingling, Liang, Pengfei, Chao, Xiaolian, Hu, Guoxin, and Yang, Zupei

Subjects
FATIGUE limit, CERAMICS, ENERGY storage, LEAD-free ceramics, ENERGY density, POWER density, FREQUENCY stability
Abstract

Lead-free relaxor ceramics (1 − x)K 0. 5 Na 0. 5 NbO3 − x Bi(Mn 0. 5 Ni 0. 5 )O3 ((1 − x)KNN- x BMN) with considerable charge–discharge characteristics and energy storage properties were prepared by a solid state method. Remarkable, a BMN doping level of 0.04, 0.96KNN–0.04BMN ceramic obtained good energy storage performance with acceptable energy storage density W rec of 1.826 J/cm3 and energy storage efficiency η of 77.4%, as well as good frequency stability (1–500 Hz) and fatigue resistance (1–5000 cycles). Meanwhile, a satisfactory charge–discharge performance with power density P D ∼ 98.90 MW/cm3, discharge time t 0. 9 < 70 ns and temperature stability (30–180∘C) was obtained in 0.96KNN–0.04BMN ceramic. The small grain size (∼ 150 nm) and the high polarizability of Bi 3 + are directly related to its good energy storage capacity. This work proposes a feasible approach for lead-free KNN-based ceramics to achieve high-energy storage and ultra-fast charge–discharge performance as well as candidate materials for the application of advanced high-temperature pulse capacitors. [ABSTRACT FROM AUTHOR]

Published
2023
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181. Evaluation of pore scattering in transparent ceramics: A simplified model for nanometric spherical pores.

Author

Zhao, Xumei, Fang, Qinglong, Xia, Caijuan, Xie, You, Wu, Di, Chao, Xiaolian, and Yang, Zupei

Subjects
LIGHT scattering, RAYLEIGH model, CERAMICS, TRANSPARENT ceramics
Abstract

It is well known that light scattering by nanometric pores is adverse to realize a high transparency in ceramics; however, a suitable model that gives this phenomenon a quantitative evaluation is still lacking. In this work, a simplified model based on Rayleigh's theory was developed in order to unravel the light scattering by nanometric pores, taking polycrystalline KNNB‐xSm ceramics with high transparency (>67% at 780 nm) as example. The validity of this model was further verified by its good agreement with experimental results. Based on detailed simulations, we came to the conclusion that the pore volume fraction p is a more important parameter on the transparency of KNNB‐xSm ceramics than pore size dpore. Our findings in this work might provide inspiring insight to obtain highly transparent KNN‐based ceramics and more. [ABSTRACT FROM AUTHOR]

Published
2023
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182. Enhanced energy storage and charge–discharge capability of (1 − x)K0.5Na0.5NbO3 − xSr(Zn1/3Nb2/3)O3 ceramics.

Author

Chen, Bi, Qiao, Xiaoshuang, Peng, Zhanhui, Liu, Lingna, Wang, Yufei, Li, Jian, Fan, Xiaoyong, Chao, Xiaolian, Yan, Long, and Yang, Zupei

Subjects
ENERGY storage, FERROELECTRIC ceramics, LEAD-free ceramics, ENERGY density, POWER density, LEAD titanate
Abstract

With high power density and energy storage density, lead-free ceramics are urgently needed for the pulsed power capacitors. Here, we adopted grain size engineering strategy, to develop a series of (1 − x)K0.5Na0.5NbO3 − xSr(Zn1/3Nb2/3)O3 [(1 − x)KNN − xSZN] lead-free relaxor ferroelectric ceramics with both high recoverable energy storage density (Wrec) and charge–discharge properties. The heterovalent occupation of the A/B-site hinders ferroelectric ordering and form polar nanodomains regions (PNRs), results in the relaxor characteristics and submicron scale grain synergistically contribute to the high energy storage density (W), approximately of 6.8 J cm−3, and Wrec, approximately of 2.75 J cm−3 for 0.92KNN–0.08SZN ceramics under fairly low applied electrical field (220 kV cm−1). Satisfactorily, current density (CD) and power density (PD) of 0.92KNN–0.08SZN ceramics reached 2197 A cm−2 and 208.7 MW cm−3, which is exceeds the most of the value ever reported for relaxors FEs. Moreover, it also possesses a high discharge energy density, approximately of 2.2 J cm−3 which remaining steady over a wide range of 20–130 °C under 170 kV cm−1. Results demonstrate that KNN–SZN ceramics not only accelerate the developing of pulsed power devices owing to their high energy storage and superior discharge capability at wider temperature, but also provide a counsel for fostering other KNN-based energy storage ceramics. [ABSTRACT FROM AUTHOR]

Published
2022
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193. Boosting the thermoelectric performance of zinc blende-like Cu2SnSe3 through phase structure and band structure regulations.

Author

Wang, Meng, He, Mingkai, Zhu, Lujun, Ma, Baopeng, Zhang, Fudong, Liang, Pengfei, Chao, Xiaolian, Yang, Zupei, He, Jiaqing, and Wu, Di

Abstract

As a variant of the zinc blende structure, p-type semiconducting Cu2SnSe3 exhibits a high potential in the field of thermoelectric energy conversion, due to the low lattice thermal conductivity and large abundance of the constituent elements. Till now, the bottleneck of achieving a comparable thermoelectric performance in Cu2SnSe3 with state-of-the-art thermoelectric material systems is its unsatisfactory electrical power factor. In this work, we realized a simultaneous increment of charge carrier concentration and mobility through In/Sb co-doping at the Sn site; detailed X-ray diffraction (XRD), Rietveld refinement, and density functional theory (DFT) band structure calculations revealed a gradual phase structure (and an associated band structure) transition from a low-symmetry monoclinic phase to a high-symmetry cubic one, which was further verified by Cs-corrected scanning transmission electron microscopy (Cs-corrected STEM) characterization. Eventually, we achieved a peak figure of merit, ZTmax ∼0.90 at 773 K and an average ZTavg ∼0.36 (323–773 K) for the composition of Cu2(Sn0.85In0.05Sb0.05Ti0.05)Se3, representing the state of the art for all Cu2SnSe3-based thermoelectric materials reported thus far. [ABSTRACT FROM AUTHOR]

Published
2022
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194. Excellent energy storage and discharge performances in Na1/2Bi1/2TiO3-based ergodic relaxors by enlarging the [AO12] cages.

Author

Li, Miaomiao, Zhu, Mankang, Zheng, Mupeng, Hou, Yudong, Wang, Jitong, Chao, Xiaolian, Yang, Zupei, Zhou, Jinling, Wang, Ke, and Ke, Xiaoxing

Abstract

In this work, a lead-free 0.86(0.93Na1/2Bi1/2TiO3-0.07BaTiO3)-0.14K1/2Bi1/2(Zn1/3Nb2/3)O3 (KBZN14) ergodic relaxor demonstrates excellent energy storage performance: Ws = 6.48 J cm−3, Wr = 5.10 J cm−3, and η = 80% at a moderate field of 29.0 kV mm−1, accompanied by an outstanding frequency and temperature stability as well as a fast discharge rate t0.9 of 69–79 ns. The excellent energy storage performance of the sample KBZN14 originates from the synergic effect of KBZN introduction: the enlargement of the [AO12] cages of the pseudocubic perovskite host to facilitate the local polarization, and the complex cations (Zn1/3Nb2/3)4+ destroy the long-range correlations to percolate the polar nanoregions (PNRs) to room temperature. Our work provides a way to design NBT-based materials as a candidate for high energy density and pulse capacitor applications. [ABSTRACT FROM AUTHOR]

Published
2022
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195. Ethylene Oxide for the Mass Deacidification of Paper Relics

Author

Li Yuhu, Zhou Yajun, Chao Xiaolian, Wang Yong, Zhao Guangtao, Qi Yunpeng, and Zhihui Jia

Subjects
chemistry.chemical_compound, Ethylene oxide, Chemical engineering, Chemistry, Mass deacidification
Abstract

In order to solve the international problem of deacidification protection at scale for the whole book and archives, this paper designs the equipment and technology of bulk deacidification treatment with ethylene oxide gas phase. the procedure is simple and the investment is small. In this process, a mixture of ethylene oxide and argon gas is added with the aid of medium vacuum, and the large-scale deacidification of acidification books and archives can be realized by controlling temperature and humidity. This technology does not need to screen acidic and alkaline paper. After the overall treatment, the paper pH value remains at 7.0 to 9.5, which has no effect on handwriting, no discoloration, and has a certain strengthening effect on the paper. The accelerated aging test shows that the pH value remains stable after deacidification and the durability is enhanced. It is a new deacidification technology of paper cultural relics with high efficiency, safety, good compatibility and scale.

Published
2020

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