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Effect of Sr/Ba Ratio on Dielectric Properties of BSTN Ceramics

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Abstract:

The phase composition of (1-x)BaO·xSrO·0.7TiO2·0.3Nb2O5 (BSTN) composite ceramics was analyzed by XRD, and the effect of Sr/Ba ratio on the dielectric properties of BSTN was investigated by impedance analyzer. The results showed that any sample with different x value contained two phases-the perovskite phase and the tungsten bronze phase. The dielectric constants of BSTN basically decreased while the tanδ increased with the increase in x value. Both dielectric constant and tanδ decreased with the applied frequency increased for the same x value. There were two Curie points for BSTN composite ceramics. The first one belonging to the perovskite phase decreased with the increase in x value, but the second one belonging to the tungsten bronze phase kept almost constant at about 300°C.

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Periodical:

Key Engineering Materials (Volumes 336-338)

Pages:

125-128

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.336-338.125

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Online since:

April 2007

Authors:

Zong Hui Zhou, Xin Cheng, Pi Yi Du, Jun Chang, Shi Feng Huang, Ling Chao Lu, Zheng Mao Ye

Keywords:

BSTN, Composite Ceramic, Dielectric Property, Sr/Ba Ratio

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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