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Colossal dielectric permittivity, reduced loss tangent and the microstructure of Ca1-xCdxCu3Ti4O12-2yF2yceramics
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Document Title
Colossal dielectric permittivity, reduced loss tangent and the microstructure of Ca1-xCdxCu3Ti4O12-2yF2yceramics
Author
Boonlakhorn J., Prachamon J., Manyam J., Krongsuk S., Thongbai P., Srepusharawoot 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; National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand; Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University, Khon Kaen, 40002, Thailand
Type
Article
Source Title
RSC Advances
ISSN
20462069
Year
2021
Volume
11
Issue
27
Page
16396-16403
Open Access
All Open Access, Gold
Publisher
Royal Society of Chemistry
DOI
10.1039/d1ra02707g
Format
Abstract
Ca1-xCdxCu3Ti4O12-2yF2y (x = y = 0, 0.10, and 0.15) ceramics were successfully prepared via a conventional solid-state reaction (SSR) method. A single-phase CaCu3Ti4O12 with a unit cell ∼7.393 Å was detected in all of the studied ceramic samples. The grain sizes of sintered Ca1-xCdxCu3Ti4O12-2yF2y ceramics were significantly enlarged with increasing dopant levels. Liquid-phase sintering mechanisms could be well matched to explain the enlarged grain size in the doped ceramics. Interestingly, preserved high dielectric permittivities, ∼36 279-38 947, and significantly reduced loss tangents, ∼0.024-0.033, were achieved in CdF2 codoped CCTO ceramics. Density functional theory results disclosed that the Cu site is the most preferable location for the Cd dopant. Moreover, F atoms preferentially remained close to the Cd atoms in this structure. An enhanced grain boundary response might be a primary cause of the improved dielectric properties in Ca1-xCdxCu3Ti4O12-2yF2y ceramics. The internal barrier layer capacitor model could well describe the colossal dielectric response of all studied sintered ceramics. © 2021 The Royal Society of Chemistry.
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Knowledge Taxonomy Level 3
Funding Sponsor
Khon Kaen University; National Science and Technology Development Agency; National Nanotechnology Center; Ministry of Higher Education, Science, Research and Innovation, Thailand
License
N/A
Rights
N/A
Publication Source
Scopus
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Colossal dielectric permittivity, reduced loss tangent and the microstructure of Ca1-xCdxCu3Ti4O12-2yF2yceramicsDownload