高性能铌酸钾钠基无铅磁电复合材料的制备与性能调控研究

Magnetoelectric composites which possess ferroelectric, ferromagnetic and magnetoelectric coupling property, have become one of the forefront and hot topic of current materials science researches. Due to the urgent requirements of environmental protection and sustainable development, the research on the environmentally friendly lead-free magnetoelectric composites with high performance is very urgent and important. The magnetoelectric coupling property is strongly influenced by composition and structure of lead-free ferroelectric phase, as well as the composite mode and coupling characteristic of ferroelectric and ferromagnetic phase. Choosing the high-performance potassium-sodium niobate based lead-free magnetoelectric composite materials systems, the research will be carried out against two key scientific questions, which are “correlation of composition design, composite mode and macro-performance”, and “correlation of structural feature and macro-performance”. The research contents include: tuning macro-performance of potassium-sodium niobate based lead-free magnetoelectric composites by composition design and composite mode; exploring ways and laws of performance improvement; characterize the structure of prepared lead-free magnetoelectric composites by modern analysis determination techniques; a grasp of correlation between structure features and macro-performance, explain the physical mechanism of performance improvement. More than 5 papers cited by SCI will be published; over 2 invention patents will be applied; assisted to cultivate more than 2 MSc students. The project is important and urgent, having scientific significance for lead-free magnetoelectric composites.

磁电复合材料因兼具铁电、铁磁和磁电耦合性能已成为当前材料科学研究的国际前沿和热点之一。由于环境保护和可持续发展的迫切需求，开展高性能环境友好型无铅磁电复合材料研究就变得紧迫和必要。无铅铁电相的组成与结构、以及铁电相和铁磁相的复合方式与耦合特性，对无铅磁电复合材料性能影响很大；本项目选择以高性能铌酸钾钠基无铅压电材料为铁电相的磁电复合材料体系，针对“组分设计、复合方式与宏观性能的关联”、“结构特征与宏观性能的关联”两个关键科学问题开展研究。研究内容包括：利用组分设计、复合方式调控无铅磁电复合材料的宏观性能；探索其性能增强途径与规律；采用现代分析测试技术表征所制备的无铅磁电复合材料结构；掌握其结构特征与宏观性能的关联，阐明性能增强的物理机理。发表高水平SCI收录论文5篇以上；申请发明专利2项以上；协助培养硕士研究生2余人。本项目重要、紧迫，对无铅磁电复合材料发展具有重要科学意义。

磁电复合材料因兼具铁电、铁磁和磁电耦合性能已成为当前材料科学研究的国际前沿和热点之一。由于环境保护和可持续发展的迫切需求，开展高性能环境友好型无铅磁电复合材料研究就变得紧迫和必要。掌握具备高性能铌酸钾钠基无铅磁电复合材料的制备方法及研究其性能提高机理具有重大价值。申请人围绕项目计划书的研究内容，系统开展了关于无铅磁电复合材料宏观性能提升的研究，取得了一些成果：（1）通过组分优化和工艺调控，获得了具有优异性能的无铅磁电复合材料中的铁电相材料和铁磁相材料；（2）研究磁电材料电学性能的提高及其温度稳定性的兼顾问题；（3）无铅磁电复合材料中的铁电相材料和铁磁相材料结构特征与宏观性能的关联。在Journal of the American Ceramics Society, Journal of Applied Physics、Journal of Materials Chemistry C 等期刊共发表SCI论文17篇。本项目的成果明确了组分设计对无铅磁电复合材料的宏观性能影响规律，阐述了其结构特征与宏观性能的关联，推动了无铅磁电复合材料的发展。