Fabrication and physical properties of ferroelectrics confined in nanoporous materials

纳米多孔材料中铁电体的制备和物理性能

• 批准号: 5442187
• 负责人: Professor Dr. Jürgen Haase
• 金额: --
• 依托单位: V.A. Fock Institute of Physics
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5442187?language=en
• 关键词: Fabrication; physical; properties; ferroelectrics; confined

Fabrication and studies of ferroelectric materials within nanoporous matrices (porous glasses, artificial opals, zeolites, mesoporous materials of type MCM-41, MCM-48 and SBA-15) with characteristic sizes in the range of 0.7 to 100 nm are planned. NaNO2, BaTiO3, and KDP nanostructures will be prepared. The main goal of the project consists in studying size effects on phase transitions in ferroelectric nanostructures (shifts of the phase transition temperatures, sizeinduced suppression of ferroelectric phase transitions, smearing the phase transitions) using NMR and acoustic methods. This allows to investigate changes in the microscopic parameters (local electric and magnetic field distribution, chemical bonding) and in the kinetics of the order parameter in confined ferroelectrics. The role of pore geometry (irregular three-dimensional pore network in porous glasses, regular pore lattices in artificial opals, zeolites and mesoporous materials, like MCM 41, will be investigated. The experimental results will be compared with theoretical predictions on the basis of a phenomenological treatment of ferroelectric phase transitions in small particles and thin films.

计划在纳米多孔矩阵（多孔玻璃，人造蛋白石，沸石，MCM-41型，MCM-48和SBA-15的中孔材料）内的制造和研究，其特征范围在0.7至100 nm的范围内。将准备Nano2，Batio3和KDP纳米结构。该项目的主要目的是研究铁电纳米结构中对相变的尺寸影响（相变温度的移位，使用NMR和声学方法的大小诱导的铁电相变的抑制，涂抹相变的抑制）。这允许研究显微镜参数（局部电场和磁场分布，化学键合）以及受约束铁电的阶参数的动力学的变化。孔几何形状（在多孔眼镜中的不规则三维孔网络，人造蛋白石中的常规孔晶格，人工蛋白石，沸石和介孔材料（如MCM 41）的作用将进行研究。将与基于理论预测的实验结果进行比较。