Synthesis and dielectric properties of strontium substituted calcium niobate ceramics
- Authors
- Yim, Haena; Yoo, So Yeon; Sung, Yung-Eun; Choi, Ji-Won
- Issue Date
- 2015-02-15
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v.622, pp.373 - 378
- Abstract
- Layered perovskite KCa2(1-x)Sr2xNb3O10 ceramic (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) materials were prepared by a conventional solid-state reaction method, and the effects of Sr substitution for Ca on the crystal structure and dielectric properties of the KCa2(1-x)Sr2xNb3O10 system were investigated. Also, potassium ions were exchanged with proton ions to obtain HCa2(1-x)Sr2xNb3O10. Then, X-ray diffraction, infra-red spectra, and energy dispersive detector analysis were carried out to verify immaculate substitution. Unlike alkali cations intercalated powder, the dielectric properties of 2Ca((1-x))Sr(x)Nb(2)O(6)-Ca2(1-x)Sr2xNb2O7 mixtures, which were obtained from HCa2(1-x)Sr2xNb3O10 by sintering, showed high dielectric permittivity with increasing amounts of strontium, and remained unaffected by frequency change from 1 kHz to 1 MHz. Its compositional dependence behavior was analyzed through Raman spectral analysis. X-ray diffraction, differential thermal analysis, and thermogravimetry observation revealed the phase transition on sintering of HCa2(1-x)Sr2xNb3O10. (C) 2014 Elsevier B.V. All rights reserved.
- Keywords
- LAYERED PEROVSKITE; KCA2NB3O10; NANOSHEETS; LAYERED PEROVSKITE; KCA2NB3O10; NANOSHEETS; Layered perovskite; Cation exchange; Dielectric response; Ceramics
- ISSN
- 0925-8388
- URI
- https://pubs.kist.re.kr/handle/201004/125764
- DOI
- 10.1016/j.jallcom.2014.09.215
- Appears in Collections:
- KIST Article > 2015
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