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Significantly improved colossal dielectric properties and maxwell—wagner relaxation of tio2—rich na1/2y1/2cu3ti4+xo12 ceramics
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Metadata
Document Title
Significantly improved colossal dielectric properties and maxwell—wagner relaxation of tio2—rich na1/2y1/2cu3ti4+xo12 ceramics
Author
Saengvong P., Chanlek N., Putasaeng B., Pengpad A., Harnchana V., Krongsuk S., Srepusharawoot P., Thongbai P.
Name from Authors Collection
Affiliations
Giant Dielectric and Computational Design Research Group (GD–CDR), Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand; Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand; National Metal and Materials Technology Center, National Science and Technology Development Agency, Thailand Science Park, Pathum Thani12120, Thailand; Institute of Nanomaterials Research and Innovation for Energy (IN–RIE), Khon Kaen University, Khon Kaen, 40002, Thailand
Type
Article
Source Title
Molecules
ISSN
14203049
Year
2021
Volume
26
Issue
19
Open Access
Gold, Green
Publisher
MDPI
DOI
10.3390/molecules26196043
Abstract
In this work, the colossal dielectric properties and Maxwell—Wagner relaxation of TiO2– rich Na1/2Y1/2Cu3Ti4+xO12 (x = 0–0.2) ceramics prepared by a solid-state reaction method are investi-gated. A single phase of Na1/2Y1/2Cu3Ti4O12 is achieved without the detection of any impurity phase. The highly dense microstructure is obtained, and the mean grain size is significantly reduced by a factor of 10 by increasing Ti molar ratio, resulting in an increased grain boundary density and hence grain boundary resistance (Rgb). The colossal permittivities of ε′ ~ 0.7–1.4 × 104 with slightly depend-ent on frequency in the frequency range of 102–106 Hz are obtained in the TiO2–rich Na1/2Y1/2Cu3Ti4+xO12 ceramics, while the dielectric loss tangent is reduced to tanδ ~ 0.016–0.020 at 1 kHz due to the increased Rgb. The semiconducting grain resistance (Rg) of the Na1/2Y1/2Cu3Ti4+xO12 ceramics increases with increasing x, corresponding to the decrease in Cu+/Cu2+ ratio. The nonlinear electrical properties of the TiO2–rich Na1/2Y1/2Cu3Ti4+xO12 ceramics can also be improved. The colossal dielectric and nonlinear electrical properties of the TiO2–rich Na1/2Y1/2Cu3Ti4+xO12 ceramics are explained by the Maxwell–Wagner relaxation model based on the formation of the Schottky barrier at the grain boundary. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Funding Sponsor
Khon Kaen University; National Research Council of Thailand
License
CC BY
Rights
Author
Publication Source
Scopus