Dielectric properties of 0.7BaO·0.3SrO·(1 − y)TiO2·yNb2O5 composite ceramics
Dielectric properties of 0.7BaO·0.3SrO·(1 − y)TiO2·yNb2O5 composite ceramics
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DOI：
10.1016/j.matchemphys.2004.06.022
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发表时间：
2004-10
影响因子：
4.6
通讯作者：
Z. Zhou;P. Du;Wenjian Wen;G. Han;G. Shen
中科院分区：
文献类型：
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作者：
Z. Zhou;P. Du;Wenjian Wen;G. Han;G. Shen
通过控制组分的过量含量，在0.1 <y < 0.7的传统陶瓷工艺条件下，成功制备了含有钙钛矿和钨青铜相的0.7 bao·0.3SrO·（1−y）TiO2·yNb2O5（BSTN）复合陶瓷。采用XRD和LCZ仪研究了复合陶瓷的相组成和介电性能。结果表明，BSTN的介电性能具有钙钛矿相和钨青铜相的双重特性。BSTN的λ tanδ取决于钙钛矿相的相对含量以及Nb5+离子在其中的溶解度。两相共存样品的介电常数明显高于只含有一种固溶体的样品，但两相共存样品的tanδ也更高。在相同成分下，随着施加频率的增加，其λ tanδ减小。在BSTN复合陶瓷中，钨青铜相的相变温度取决于Ti4+离子在相中的溶解度和钙钛矿相的相对含量。最低转变温度在200℃左右，比纯钨青铜相Sr0.3Ba0.7Nb2O6低90℃左右。
The 0.7BaO·0.3SrO·(1 −y)TiO2·yNb2O5(BSTN) composite ceramics with both the perovskite and the tungsten bronze phases were successfully prepared by controlling some excessive contents of components and traditional ceramic process where 0.1 <y < 0.7. The phase composition and dielectric properties of the composite ceramics were investigated by XRD and LCZ Meter. According to the results, the dielectric properties of the BSTN have both characteristics of the perovskite phase and the tungsten bronze phase. The ɛrand tanδ of the BSTN depend on the relative content of the perovskite phase as well as the solubility of Nb5+ions in it. The samples in which two phases coexist clearly have higher dielectric constant than the samples that only contain one solid solution, but the tanδ of those two phases coexisting is also higher. The ɛrand tanδ decrease with the increase of applied frequency for same composition. In the BSTN composite ceramics, the phase transition temperature of the tungsten bronze phase depends on the solubility of Ti4+ions in the phase and the relative content of the perovskite phase. The lowest transition temperature is around 200°C and it is about 90°C lower than the pure tungsten bronze phase Sr0.3Ba0.7Nb2O6.