拟以近期用传统制备电子陶瓷的固相反应方法得到的高压电性能（d33值约为254pC/N）的（K,Na,Li）(Nb,Ta)O3（简写KNLNT）陶瓷为主要研究对象，考察KNN基陶瓷的压电性能，介电性质以及他们的温度依存性，微观组织结构和电畴构型，并且探讨它们之间的关系，从而解释前人报道的KNN基陶瓷中因多型相变而存在的两相共存态是否是影响陶瓷高压电性能的原因，揭示影响KNN基陶瓷压电物性和温度依存性的微观作用机制。开展本项目的研究，将深化对KNN基陶瓷微观组织结构以及在相变点附近显示高压电活性和优良的温度稳定性的机理认识和理解，丰富铁电压电材料学的内容, 促进学科的发展；对确立以普通固相反应方法制备性能优良的环境友好无铅压电陶瓷材料的方法有重要的现实意义。

Lead-free piezoelectric ceramics (K, Na, Li) (Nb, Ta) O3 (abbreviated as KNLNT)were recently prepared following the conventional solid state reaction method, and the piezoelectric constant can reach up to 254pC / N. we choose this system ceramics as the main object to carry out the researches of high piezoelectric performance and temperature stability from the microscopic point of view.We will investigate the piezoelectric properties of KNN-based ceramics, dielectric properties and their temperature dependencies, microstructure and domain configurations, and explore their relationships. Thus we can explain the previously reported result that the enhanced piezoelectric properties of the ceramics should be attributed to the polymorphic phase transition(PPT) near room temperature, and reveal the micro-mechanism of excellent piezoelectric properties and temperature stability in KNN-based ceramics.Carrying out this investigation will further deepen understanding the mechanism of exhibiting high piezoelectricity and good temperature stability in the vicinity of the phase transition point, enrich the contents of ferroelectric and piezoelectric material science, promote the development of this subject; and this study have important practical significance on excellent performance and environment-friendly lead-free piezoelectric ceramic materials prepared by ordinary solid state reaction method.