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Electron-pinned defect dipoles in (Li, Al) co-doped ZnO ceramics with colossal dielectric permittivity
Huang, D; Li, WL; Liu, ZF; Li, YX; Ton-That, C; Cheng, JQ; Choy, WCH; Ling, FCC
2020-03-07
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Issue9Pages:4764
SubtypeArticle
AbstractThrough systematic optimization studies of Li and Al co-doped ZnO ceramics we demonstrate that colossal permittivity with low dielectric loss (epsilon(r) = 9862 and tan d = 0.159 at the frequency of 1 kHz) at room temperature can be achieved in Zn-0.99(Li-0.1, Al-0.2)(0.033)O. The colossal dielectric constant (CDC) and low dielectric loss in this ceramic have relatively good frequency and temperature stability. Annealing the ceramic at 900 degrees C in oxygen leads to the drop of 3r to 2250 but the dielectric loss remains at similar to 0.10. Dielectric spectrum analysis shows that the CDC is associated with two relaxation processes. One of these process vanishes and the other one persists after annealing, suggesting that P1 is associated with oxygen-deficient defects. For samples exhibiting CDC, ac conductivity study revealed correlated barrier hopping between defect states in the band gap. A model involving these defects as the electron pinned defect dipole is proposed. The experimental dielectric data are well described by this model using Kirkwood's theory and Kramer-Kronig transformation.
DOI10.1039/c9ta12808e
WOS KeywordFERROELECTRICITY ; RELAXATION ; TIO2 ; CACU3TI4O12 ; BEHAVIOR
Language英语
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
PublisherROYAL SOC CHEMISTRY
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28236
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Huang, D,Li, WL,Liu, ZF,et al. Electron-pinned defect dipoles in (Li, Al) co-doped ZnO ceramics with colossal dielectric permittivity[J]. JOURNAL OF MATERIALS CHEMISTRY A,2020(9):4764.
APA Huang, D.,Li, WL.,Liu, ZF.,Li, YX.,Ton-That, C.,...&Ling, FCC.(2020).Electron-pinned defect dipoles in (Li, Al) co-doped ZnO ceramics with colossal dielectric permittivity.JOURNAL OF MATERIALS CHEMISTRY A(9),4764.
MLA Huang, D,et al."Electron-pinned defect dipoles in (Li, Al) co-doped ZnO ceramics with colossal dielectric permittivity".JOURNAL OF MATERIALS CHEMISTRY A .9(2020):4764.
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