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Influences of Sr2+ Doping on Microstructure, Giant Dielectric Behavior, and Non-Ohmic Properties of CaCu3Ti4O12/CaTiO3 Ceramic Composites
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Document Title
Influences of Sr2+ Doping on Microstructure, Giant Dielectric Behavior, and Non-Ohmic Properties of CaCu3Ti4O12/CaTiO3 Ceramic Composites
Author
Jumpatam J, Putasaeng B, Chanlek N, Thongbai P
Name from Authors Collection
Affiliations
Surindra Rajabhat University; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC); Khon Kaen University; Khon Kaen University
Type
Article
Source Title
MOLECULES
Year
2021
Volume
26
Issue
7
Page
-
Open Access
Green Published, gold
Publisher
MDPI
DOI
10.3390/molecules26071994
Format
Abstract
The microstructure, dielectric response, and nonlinear current-voltage properties of Sr2+-doped CaCu3Ti4O12/CaTiO3 (CCTO/CTO) ceramic composites, which were prepared by a solid-state reaction method using a single step from the starting nominal composition of CCTO/CTO/xSrO, were investigated. The CCTO and CTO phases were detected in the X-ray diffraction patterns. The lattice parameter increased with increasing Sr2+ doping concentration. The phase compositions of CCTO and CTO were confirmed by energy-dispersive X-ray spectroscopy with elemental mapping in the sintered ceramics. It can be confirmed that most of the Sr2+ ions substituted into the CTO phase, while some minor portion substituted into the CCTO phase. Furthermore, small segregation of Cu-rich was observed along the grain boundaries. The dielectric permittivity of the CCTO/CTO composite slightly decreased by doping with Sr2+, while the loss tangent was greatly reduced. Furthermore, the dielectric properties in a high-temperature range of the Sr2+-doped CCTO/CTO ceramic composites can be improved. Interestingly, the nonlinear electrical properties of the Sr2+-doped CCTO/CTO ceramic composites were significantly enhanced. The improved dielectric and nonlinear electrical properties of the Sr2+-doped CCTO/CTO ceramic composites were explained by the enhancement of the electrical properties of the internal interfaces.
Industrial Classification
Knowledge Taxonomy Level 1
Knowledge Taxonomy Level 2
Funding Sponsor
Research and Graduate Studies, Basic Research Fund of Khon Kaen University [15500147]; Synchrotron Light Research Institute, Khon Kaen University; Thailand Research Fund (TRF) [BRG6180003]; Khon Kaen University, Thailand
License
CC BY
Rights
Authors
Publication Source
WOS