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- W4286567505 abstract "Colossal dielectric constants (ε′∼11,550 – 15,535) with very low dielectric loss (tanδ ∼0.013 – 0.033) at 30 °C and 1 kHz were achieved in CaCu2.8-xZnxTi4O12 (x = 0.00 – 0.10) ceramics sintered at 1100 °C for 8 and 12 h. Nonlinear J-E behaviors were observed in these ceramics with an extremely high nonlinear coefficient (α) of ∼10.14 in CaCu2.75Zn0.05Ti4O12 sintered for 12 h. Additionally, a breakdown electric field (Eb) was found to increase in samples with a high Zn2+ ion content. To reveal these excellent properties, the phase and microstructure of these materials were explored using XRD and FE-SEM. Elemental mapping and EDXS spectra confirmed the presence of TiO2 and CaTiO3 minor phases with Zn2+ ions in the main CaCu3Ti4O12 phase. Improved dielectric properties and nonlinear J-E behaviors are discussed based on the increased grain boundary resistance (Rgb) due to the presence of minor phases and substitution of Zn2+ ions at the Cu2+ sites of CaCu2.8-xZnxTi4O12. The XPS results confirmed that electrons could hop at the Cu+− O − Cu2+ and Cu3+− O − Cu2+ sites, indicating the presence of semiconducting grains in these ceramics." @default.
- W4286567505 created "2022-07-22" @default.
- W4286567505 creator A5008390057 @default.
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- W4286567505 creator A5046766182 @default.
- W4286567505 date "2022-07-01" @default.
- W4286567505 modified "2023-10-09" @default.
- W4286567505 title "A novel CaCu2.8-xZnxTi4O12 system: a high-performance dielectric with nonlinear J − E properties" @default.
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- W4286567505 doi "https://doi.org/10.1016/j.jmrt.2022.07.016" @default.
- W4286567505 hasPublicationYear "2022" @default.
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