钙钛矿结构无铅压电陶瓷的性能优化与可控制备研究

项目名称： 钙钛矿结构无铅压电陶瓷的性能优化与可控制备研究

项目编号： No.51332003

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 朱建国

作者单位： 四川大学

项目金额： 330万元

中文摘要： 高性能无铅压电陶瓷是近年国际新材料研究的前沿和热点之一。本项目选择钙钛矿结构的KNN和BNT基陶瓷体系，针对陶瓷的“相结构调控与压电性能”、“宏观性能增强与微结构特征”、“性能优化与多层次可控制备”等三个关键科学问题开展研究；包括：采用固相法、模板法、溶胶凝胶法等技术制备陶瓷和薄膜；采用XRD、PFM、球差校正TEM、同步辐射等表征材料组分、晶格结构、相变与电畴；研究材料在外界条件下的响应特性及工艺对结构和性能的影响；掌握材料的掺杂机理、相界调控原理、多元复合和性能优化规律；掌握材料多层次可控制备原理与技术；提高材料的温度和工艺稳定性；制备出压电活性高、性能和工艺可控的新型高性能无铅压电陶瓷，并研制出频率、换能等原型器件。本项目重要、紧迫，对无铅压电陶瓷和器件具重要意义；发表高水平SCI收录论文40余篇；申请或授权获发明专利10项以上；培养博硕士30余人；建设一支国际上有影响的研发团队。

中文关键词： 无铅压电陶瓷;铌酸钾钠/钛酸铋钠;相结构;可控制备;压电性能

英文摘要： High-performance lead-free piezoelectric ceramics are one of the forefront and hot topic of international new materials researches. Choosing the KNN and BNT-based ceramic systems, the research will be carried out against three key scientific questions of ceramics, which are “phase structure control and piezoelectric performance”, “macro-performance improvement and microstructure characteristics”, and “performance optimization and multilevel controllable synthesis”. The research contains: synthesis of ceramics and films by solid-state, template, sol-gel method, etc.; characterization of content, lattice structure, phase transition and domain by XRD, PFM, spherical aberration correcting TEM, synchrotron-radiation, etc.; study on how the response characteristic of materials in the environmental conditions affect their structure and properties; a grasp of the mechanism of doping mechanism, phase boundary modification, multi-composition, and performance optimization; a grasp of the multi-level controllable synthesis technique and its underlying mechanism; an improvement on the temperature and processing stabilities of the lead-free piezoelectric materials; to synthesis the novel, high piezoelectric-activity lead-free piezoelectric ceramics, which have controllable performance and processing, and to design prototype devices of frequency, transduction, etc. The project is important and urgent, having significance for lead-free piezoelectric ceramics and devices; more than 40 papers cited by SCI will be published; over 10 invention patents will be authorized (or applied); more than 30 PhD or MSc students will be cultivated; to construct an international-influencing research group.

英文关键词： lead-free piezoceramics;KNN/BNT;phase sturcture;controllable synthesis ;piezoelectric properties