Synthesis and dielectric properties of strontium substituted calcium niobate ceramics

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[1] [1,Yim, Haena
[2] Yeon Yoo, So
[3] 2,Sung, Yung-Eun
[4] 1,Choi, Ji-Won
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Choi, Ji-Won | 1600年 / Elsevier Ltd卷 / 622期
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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)SrxNb2O6-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. © 2014 Elsevier B.V. All rights reserved;
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