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Your search keyword '"Kuai, Weijie"' showing total 11 results
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11 results on '"Kuai, Weijie"'

10. Reversible and irreversible domain wall dynamics in [011]C oriented relaxor ferroelectric single crystals.

Author

Fang, Hong, Wang, Lihai, Kuai, Weijie, Du, Juan, Jiang, Guicheng, Lu, Xiaoyan, Zhao, Minglei, Wang, Chunming, Su, Wenbin, Zheng, Limei, Wang, Chunying, and Wang, Chunlei

Subjects
DOMAIN walls (String models), FERROELECTRIC crystals, SINGLE crystals, FERROELECTRIC materials, DIELECTRIC properties, PYROELECTRICITY
Abstract

Domain wall motions mainly affect all kinds of properties of ferroelectric materials, such as piezoelectricity, dielectric response, and mechanical loss, and the extrinsic contributions associated with domain wall motions have always been an important issue. In this study, the reversible and irreversible extrinsic contributions to the dielectric properties of [011]C‐oriented 0.27Pb(In1/2Nb1/2)O3‐0.46Pb(Mg1/3Nb2/3)O3‐0.27PbTiO3:Mn single crystals have been extracted by the Rayleigh analysis. We found that in the unpoled samples, the extrinsic contributions of reversible and irreversible domain wall motions to dielectric properties significantly reduced, whereas after poling, only the irreversible extrinsic contribution decreased. The pinning effect in the 2R domain structure is much weaker than that in the 4R domain structure, leading to the low enhancement of Qm and a slight decrease in piezoelectricity caused by acceptor doping in 2R domain structure. This study explores the domain wall dynamics of acceptor‐doped single crystals and mainly guides on further performance optimization in PbTiO3‐based relaxor single crystals. [ABSTRACT FROM AUTHOR]

Published
2020
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11. Enhanced electrical performance in CaBi4Ti4O15ceramics through synergistic chemical doping and texture engineering

Author

Zhao, Le, Li, Guohao, Zhai, Xiao, Kuai, Weijie, Zhai, Yuzhi, Tian, Gang, Gai, Zhigang, Zhao, Minglei, Du, Juan, Zhang, Hongjun, and Zheng, Limei

Abstract

High-temperature piezoelectric materials with excellent piezoelectricity, low dielectric loss and large resistivity are highly desired for many industrial sectors such as aerospace, aircraft and nuclear power. Here a synergistic design strategy combining microstructural texture and chemical doping is employed to optimize CaBi4Ti4O15(CBT) ceramics with bismuth layer structure. High textured microstructure with an orientation factor of 80%–82 % has been successfully achieved by the spark plasma sintering technique. Furthermore, by doping MnO2, both advantages of hard doping and sintering aids are used to obtain the excellent electrical performance of d33 = 27.3 pC/N, tanδ∼0.1 %, Q31∼2307 and electrical resistivity ρ∼6.5 × 1010 Ω cm. Up to 600 °C, the 0.2 % (in mass) Mn doped CBT ceramics still exhibit high performance of d33 = 26.4 pC/N, ρ∼1.5 × 106 Ω cm and tanδ∼15.8 %, keeping at an applicable level, thus the upper-temperature limit for practical application of the CBT ceramics is greatly increased. This work paves a new way for developing and fabricating excellent high-temperature piezoelectric materials.

Published
2023
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