Search

Your search keyword '"Yuan, Changlai"' showing total 598 results
Start Over Author "Yuan, Changlai"
598 results on '"Yuan, Changlai"'

43. Excellent low-field energy storage properties and high density achieved in Bi0.48Na0.48Ba0.04TiO3-based oxide ceramics via interposing (Na0.97Bi0.01)+/Ta5+ at A/B sites

Author

Du, Jiwei, Shi, Tianhui, Feng, Qin, Jia, Ronghao, Hu, Jianan, Yuan, Changlai, Wang, Xinpeng, Chen, Xiyong, Luo, Nengneng, and Zhai, Jiwei

Abstract

Lead-free dielectric ceramics are one of the most essential candidates for reforming pulsed power capacitors; nevertheless, formidable hurdles are posed by their high hysteresis and low energy storage properties. Dielectric ceramic capacitors with ultra-high energy storage performance usually need to be realized under the conditions of high electric field. Its application in miniaturized integrated electronic devices is severely limited. In this work, A-site deficiency was designed in Na0.97Bi0.01TaO3-modified Bi0.48Na0.48Ba0.04TiO3 lead-free relaxor ferroelectric ceramics to increase oxygen vacancy content, achieve local disorder and construct local multi-phase coexistence, which causes low hysteresis with excellent high energy density at low electric fields (LEFs). Results indicated that the introduction of A-site deficiency improved the concentration of oxygen vacancies while reconstructing the local structure disorder. Benefiting from the synergistic effect of both, a high energy recoverable density of ∼7.98 J cm−3 and efficiency η of ∼83.7% was determined in 0.84Bi0.48Na0.48Ba0.04TiO3-0.16Na0.97Bi0.01TaO3-modified ceramics under 330 kV cm−1. Furthermore, the modified ceramics had an acceptable frequency stability (0.5–130 Hz) and temperature stability (RT – 180 °C) with exact discharge density. These findings can lead to the development of an innovative strategy for fabricating energy-storage ceramics under low electric field conditions. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

44. The Effect of Multi‐Fields Synergy from Electric/Light/Thermal/Force Technologies on Photovoltaic Performance of Ba0.06Bi0.47Na0.47TiO3 Ferroelectric Ceramics via the Mg/Co Substitution at A/B Sites.

Author

Gao, Qingyuan, Yang, Shanming, Yuan, Changlai, Liu, Xiao, Zhao, Jingtai, Rao, Guanghui, Zhou, Changrong, Xu, Jiwen, Zhu, Baohua, and Lei, Wen

Subjects
FERROELECTRIC materials, FERROELECTRIC ceramics, FERROELECTRICITY, PHENOMENOLOGICAL theory (Physics), ELECTRIC fields, PHOTOVOLTAIC effect
Abstract

Currently, it is widely reported that the photovoltaic effect in ferroelectric materials can be promoted by the application of a piezoelectric force, an external electric field, and intense light illumination. Here, a semiconducting ferroelectric composition is introduced, (1−x) Ba0.06Bi0.47Na0.47TiO3‐xMgCoO3 (abbreviated as xMgCo, where x = 0.02–0.08), synthesized through Mg/Co ions codoping. This process effectively narrows the optical bandgaps to a spectrum of 1.38–3.06 eV. Notably, the system exhibits a substantial increase in short‐circuit photocurrent density (Jsc), by the synergy of the electric, light, and thermal fields. The Jsc can still be further enhanced by the extra introduction of a force field. Additionally, the Jsc also shows an obvious increase after the high field pre‐poling. The generation of a considerable number of oxygen vacancies due to the Co2+/Co3+ mixed valence state (in a 1:3 ratio) contributes to the reduced optimal bandgap. The integration of Mg2+ ion at the A‐site restrains the loss and sustains robust ferroelectricity (Pr = 24.1 µC cm−2), high polarizability under an electric field, and a significant piezoelectric coefficient (d33 = 102 pC N−1). This study provides a novel perspective on the physical phenomena arising from the synergy of multiple fields in ferroelectric photovoltaic materials. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results