A Novel One-Step Flame Synthesis Method for Tungsten-Doped CCTO
- Authors
- Singh, Laxman; Sin, Byung Cheol; Kim, Ill Won; Mandal, K. D.; Chung, Hoeil; Lee, Youngil
- Issue Date
- Jan-2016
- Publisher
- WILEY
- Citation
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY, v.99, no.1, pp.27 - 34
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF THE AMERICAN CERAMIC SOCIETY
- Volume
- 99
- Number
- 1
- Start Page
- 27
- End Page
- 34
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/155323
- DOI
- 10.1111/jace.13930
- ISSN
- 0002-7820
- Abstract
- An efficient synthesis is used for the first time to prepare CaCu3Ti4-xWxO12 (x=0.01, 0.03, and 0.05) electroceramics for energy storage capacitors. CaCu3Ti4-xWxO12 ceramics are synthesized via flame synthesis of metal nitrates precursors in nonaqueous solution using cheap, stable, and insoluble solid TiO2 powder. The pathway yielded a CaCu3Ti4O12 (CCTO) phase with the traces of CuO and CaTiO3 sintered at 1050 degrees C for 30h. The SEM micrograph shows the grains with smooth surfaces associated with cubical appearance and the size range of 1.5-7, 2.0-7.5, and 2.0-8.0m for CCTWO01, CCTWO03, and CCTWO05, respectively. The EDX and XPS analyses show the presence of Ca, Cu, Ti, W, and O elements confirming the purity of these ceramics. The complex impedance and modulus (M) spectroscopy show that the dielectric constant (epsilon(r)) values of the W-doped CCTO were dominantly affected by the electrical properties of the grain boundary, which is also evident from the SEM micrographs. The grain-boundary resistance decreased with increasing tungsten content. The activation energies for the grain boundaries were calculated from the impedance and modulus data using the slope of the ln versus 1/T and were found to be in the range 0.62-0.67eV.
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