| 铁电态-顺电态双层薄膜的高介电调谐 |
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| 引用本文： | 王英龙,魏同茹,刘保亭,傅广生.铁电态-顺电态双层薄膜的高介电调谐[J].电子元件与材料,2007,26(10):25-28. |
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| 作者姓名： | 王英龙 魏同茹 刘保亭 傅广生 |
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| 基金项目： | 国家自然科学基金
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河北省自然科学基金
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人事部留学人员科技活动项目择优资助项目
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教育部留学回国人员科研启动基金 |
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| 摘 要： | 基于Landau-Devonshire自由能理论建立了热力学模型,对生长在(001)SrTiO3衬底上的PbZr0.4Ti0.6O3(PZT)/SrTiO3(STO)双层异质外延结构铁电薄膜以及不受约束的双层薄膜的介电响应与调谐率进行了研究。结果表明,在两层薄膜为无约束的自由薄膜情况下,STO厚度占双层薄膜总厚度的百分比为30%时,相对介电响应达到最大值约3.3×105,当两薄膜为异质外延结构时,其百分比为51%时,相对介电响应达到最大值约4×105。同时,调谐率还随外加电场的增大而增大,在临界百分比时,调谐率可达到约99%。
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| 关 键 词： | 无机非金属材料 铁电薄膜 高介电调谐 理论模拟 异质外延 介电响应 |
| 文章编号： | 1001-2028（2007）10-0025-04 |
| 修稿时间： | 2007-06-08 |
High dielectric tunability in ferroelectric-paraelectric bilayers thin film |
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| WANG Ying-long,WEI Tong-ru,LIU Bao-ting,FU Guang-sheng.High dielectric tunability in ferroelectric-paraelectric bilayers thin film[J].Electronic Components & Materials,2007,26(10):25-28. |
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| Authors: | WANG Ying-long WEI Tong-ru LIU Bao-ting FU Guang-sheng |
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| Abstract: | Based on Landau-Devonshire free energy theory,A thermodynamic model was built for PbZr0.4Ti0.6O3/SrTiO3 heteroepitaxial bilayer on (001) SrTiO3 and unconstrained PbZr0.4Ti0.6O3/SrTiO3 bilayers. The dielectric response and high dielectric tunability in bilayers was investigated. It is shown that the critical fraction of SrTiO3 is 30% and relative dielectric response can reach ≈3.3×105 when the bilayers are freestanding,while the critical fraction of SrTiO3 is 51% and relative dielectric response reach ≈4×105 when bilayers are heteroepitaxial. Besides,the tunability of these structures are increased with increasing electric field,the maximum is ≈99%. |
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| Keywords: | non-metallic inorganic material ferroelectric film high dielectric tunability theoretic simulation heteroepotaxial dielectric response |
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