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STRUCTURAL AND DIELECTRIC PROPERTIES OF Ba_(0.6)Sr_(0.4)T_iO_3 THIN FILMS

机译:Ba_(0.6)Sr_(0.4)T_iO_3薄膜的结构和介电性能

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摘要

We report a systematic study of the structural and dielectric properties of barium strontium titanate, Ba_(0.6)Sr_(0.4)T_iO_3 (BST-0.4), films grown by pulsed laser deposition on LaAlO_3 and MgO substrates. By optimizing the processing conditions, choosing appropriate substrate materials, and constructing layered architectures, we have successfully deposited BST-0.4 films on both LaAlO_3 and MgO substrates with large dielectric nonlinearity and low dielectric loss. X-ray diffraction and transmission electron microscopy analyses reveal that the dielectric tunability and the dielectric loss are closely related to the crystallinity of the BST-0.4 films. We have also observed that a small variation of D value, defined as the ratio of in-plane lattice constant/out-of-plane lattice constant, can result in a significantly large change of dielectric properties of the BST films.
机译:我们报告了钛酸钡锶钡Ba_(0.6)Sr_(0.4)T_iO_3(BST-0.4)的结构和介电性能的系统研究,该膜是通过在LaAlO_3和MgO衬底上脉冲激光沉积而生长的。通过优化工艺条件,选择合适的基板材料并构建分层体系结构,我们已成功在介电非线性大且介电损耗低的LaAlO_3和MgO基板上成功沉积了BST-0.4薄膜。 X射线衍射和透射电子显微镜分析表明,介电常数和介电损耗与BST-0.4薄膜的结晶度密切相关。我们还观察到,D值的微小变化(定义为面内晶格常数/面外晶格常数的比率)会导致BST薄膜介电性能发生很大变化。

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