Dielectric properties and abnormal C-V characteristics of Ba0.5Sr0.5TiO3-Bi1.5ZnNb1.5O7 composite thin films grown on MgO (001) substrates by pulsed laser deposition
Dielectric properties and abnormal C-V characteristics of Ba0.5Sr0.5TiO3-Bi1.5ZnNb1.5O7 composite thin films grown on MgO (001) substrates by pulsed laser deposition
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DOI：
10.1063/1.2358934
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发表时间：
2006-10
影响因子：
4
通讯作者：
H. Tian;Yu Wang;Danyang Wang;J. Miao;J. Qi;H. Chan;C. Choy
中科院分区：
文献类型：
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作者：
H. Tian;Yu Wang;Danyang Wang;J. Miao;J. Qi;H. Chan;C. Choy
采用脉冲激光沉积法在MgO（001）单晶衬底上生长了高度c轴取向的Ba0.5Sr0.5TiO3基复合薄膜，并对薄膜的面内介电性能进行了研究。X射线衍射表征显示了良好的结晶度。室温下的介电常数和损耗分别为200和0.001-0.007。蝶形的C-V特性曲线表明，在1 MHz、0.8MVscincm的直流偏压下，薄膜的面内介电调谐率大于90%。对异常C-V曲线进行了简要讨论。Ba_（0.5）Sr_（0.5）TiO_3-Bi_（1.5）Zn_（1.5）Nb_（1.5）O_7复合薄膜具有广泛的微波可调谐应用前景。
Highly c-axis oriented Ba0.5Sr0.5TiO3-based composite thin films were grown on MgO (001) single-crystal substrates by pulsed laser deposition and the in-plane dielectric properties of the films evaluated. X-ray diffraction characterization revealed a good crystallinity. The dielectric constant and loss were found to be 200 and 0.001–0.007 at room temperature, respectively. The butterfly-shaped C-V characteristic curve evidenced an enhanced in-plane dielectric tunability of >90% in the films at 1MHz under a dc bias field of 0.8MV∕cm. A brief discussion is given on the abnormal C-V curves. Various tunable microwave applications of Ba0.5Sr0.5TiO3–Bi1.5ZnNb1.5O7 composite thin films are expected.