Dielectric and tunable properties of bulk columnar Ba0.6Sr0.4TiO3/MgO composites
Dielectric and tunable properties of bulk columnar Ba0.6Sr0.4TiO3/MgO composites
复制标题
DOI：
10.1016/j.ceramint.2012.06.058
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
W. Liao;R. Liang;Genshui Wang;F. Cao;Xianlin Dong
中科院分区：
文献类型：
--
作者：
W. Liao;R. Liang;Genshui Wang;F. Cao;Xianlin Dong
采用放电等离子烧结（SPS）方法制备了Ba0.6Sr0.4TiO3（BST）/MgO柱状复合材料。研究了柱状复合材料的微观结构、介电性能和调谐性能。未改性BST居里温度与MgO添加量的增加表明，足够的抑制离子之间的相互扩散的两相。当MgO质量分数达到15%时，介电常数从7000下降到3800，而可调谐性仍保持在45%以上的高水平。介电非线性系数β随MgO含量的增加而增大。实验结果与理论预测相一致，证实了采用柱状模型制备复合材料，可以在不降低可调谐性的前提下降低介电常数，这将有助于可调谐器件在无线通信系统中的应用。
Ba0.6Sr0.4TiO3(BST)/MgO columnar composites are fabricated via the spark plasma sintering (SPS) method. The microstructure, dielectric and tunable properties of columnar composites are investigated. The unmodified BST Curie temperatures with the increase of MgO addition indicate a sufficient suppression of ions interdiffusion between the two phases. The dielectric constant is decreased from 7000 to 3800 when MgO weight ratio is up to 15% while the tunability still stays at high level over 45%. The coefficient of the dielectric nonlinearity β shows a growing trend with increasing MgO content. The experimental results are in agreement with the theoretical prediction and confirm that if the composite is fabricated in columnar model, a reduction of dielectric constant without a deterioration of tunability could be achieved, which make them useful for potential tunable device applications in wireless communication system.