非一致层厚的多层铁电单晶结构的特性和优化  

Characteristics and Optimization of Multilayer Ferroelectric Single Crystal Structures with Non-uniform Layer Thicknesses

作　　者：席奎[1] 吴正斌[1] 李闪闪[1,2] 郑海荣[1] 朱华兵[3] 吴樵[4] 

机构地区：[1]中国科学院深圳先进技术研究院,深圳518055 [2]深圳大学材料学院,深圳518060 [3]海军工程大学兵器工程系,武汉430033 [4]北京大学信息科学技术学院,北京100871

出　　处：《功能材料与器件学报》2012年第4期322-326,331,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(No.10804075);广东省中国科学院全面战略合作项目(2010B090300004;2011B090300095)

摘　　要：本文针对宽频带超声换能器的设计,对采用非一致层厚的多层铁电单晶结构的特性进行了研究和优化。建立了基于复材料参数的多层压电结构的理论模型,运用模拟退火全局优化算法对多层铌镁酸铅-钛酸铅结构的层厚进行了优化,并分析了各层厚度变化对多层压电结构频率响应特性的影响。理论仿真和实验结果证明非一致层厚的多层铁电单晶结构能够用于设计和制造高性能宽频带超声换能器。In this paper, characteristics of multilayer ferroelectric single crystal structures with non - uni- form layer thicknesses were studied and optimized for broadband ultrasonic transducer design. The theo- retical model of muhilayer piezoelectric structures based on complex piezoelectric material parameters has been established. Simulated Annealing optimization was used to optimize the layer thicknesses of a multi- layer PMN - PT structure. The effects of layer thickness variations on the muhilayer device were ana- lyzed. It is verified that multilayer ferroelectric single crystal structures with non - uniform layer thicknesses are able to be used to design and manufacture high performance broadband ultrasonic transducers with theoretical simulation and practical measurement.

关 键 词：宽频带超声换能器 多层压电结构 PMN-PT 优化 

分 类 号：TM22[一般工业技术—材料科学与工程]