红外探测用无铅铁电陶瓷的热释电特性研究进展

铁电陶瓷具有优异的热释电性能,是红外探测器的核心敏感元材料,目前普遍采用铅基陶瓷材料,发展无铅铁电陶瓷用于热释电红外探测是近年来电介质物理与材料的一个热点.本文综述了无铅铁电陶瓷的热释电性能研究进展,主要包括钛酸钡基、钛酸铋钠基、铌酸锶钡基、铌酸钾钠基等系列铁电陶瓷的热释电效应研究现状,归纳了不同体系增强热释电效应的手段.通过比较分析主要无铅铁电陶瓷的热释电性能和退极化性能的制约关系,指出钛酸铋钠基陶瓷是目前最具应用潜力的无铅材料体系,并对无铅铁电陶瓷热释电探测应用未来的发展方向进行了展望.

Research progress of pyroelectric characteristics of lead-free ferroelectric ceramics for infrared detection

Due to the excellent pyroelectric properties,ferroelectric ceramics containing lead element are widely used as sensitive materials in pyroelectric infrared detectors at present.The research and development of lead-free ferroelectric ceramics for this kind of detector has become a hot research spot in the areas of dielectric physics and materials in recent years.In this article,the recent research progress of the pyroelectric effect in series of important lead-free ferroelectric ceramic systems is reviewed,including barium titanate,sodium bismuth titanate,potassium sodium niobite,barium strontium niobite,etc.The methods of enhancing the pyroelectric effect are summarized,including doping modification,phase boundary design,process improvement,etc.Through comparative analysis of the relationship between pyroelectric properties and depolarization temperatures of different systems,it is concluded that bismuth sodium titanate based ceramics are the most potential lead-free materials in the future.The prospective research work of lead-free ferroelectric ceramics for infrared detection is also suggested.