Temperature stability of permittivity and dielectric relaxationin multilayered thin films of (Ba0.80Sr0.20)(Ti1−xZrx)O3with a compositionally graded layer
Temperature stability of permittivity and dielectric relaxationin multilayered thin films of (Ba0.80Sr0.20)(Ti1−xZrx)O3with a compositionally graded layer
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DOI：
10.1063/1.1767605
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发表时间：
2004-06
影响因子：
4
通讯作者：
B. Cheng;Can Wang;Shuopei Wang;T. Button;H. B. Lu;Y. L. Zhou;Zhong-Bo Chen;G. Yang
中科院分区：
文献类型：
--
作者：
B. Cheng;Can Wang;Shuopei Wang;T. Button;H. B. Lu;Y. L. Zhou;Zhong-Bo Chen;G. Yang
通过脉冲激光沉积技术，使用四个 BSTZ 陶瓷靶材 (x=0.36,0.18,0.08,0) 在 Nb 掺杂 SrTiO3 基底上成功制备了具有各种成分梯度层 (CGL) 的多层薄 (Ba0.80Sr0.20)(Ti1−xZrx)O3 (BSTZ) 薄膜。通过改变 CGL，在多层薄膜中人为地调整成分的梯度，并且 X 射线衍射表明多层薄膜中的内应力受到调节。在120至440K的温度范围内研究了成分梯度对介电性能的影响。发现多层膜的介电常数的温度稳定性随着成分梯度的增加而提高。此外，还观察到活化能为1.02eV的介电弛豫过程，该过程也与成分梯度有关，并且可以描述为氧空位的运动。结果表明，介电常数的温度稳定性可以通过多...
Mutilayered thin (Ba0.80Sr0.20)(Ti1−xZrx)O3 (BSTZ) films with various compositional graded layers (CGL) have been successfully fabricated on Nb doped SrTiO3 substrates by pulsed-laser deposition technique with four BSTZ ceramic targets (x=0.36,0.18,0.08,0). The gradients of compositions are artificially tailored in multilayered thin films by varying the CGL, and x-ray diffraction indicates that the internal stress is modulated in the multilayered films. Influence of the composition gradient on the dielectric properties has been investigated at the temperature range from 120 to 440K. Temperature stability of permittivity of the multilayered films is found to be improved with the increase of the gradients of compositions. Moreover, a dielectric relaxation process with activation energy of 1.02eV is observed, which is also related to the composition gradient, and can be described to motion of oxygen vacancies. The results show that the temperature stability of permittivity can be tailed by the design of mult...