题目：PMN-PT single crystal-based medical ultrasound transducers  

　　报告人：戴吉岩  教授 

　　香港理工大学应用物理系教授 

　　时间：2017年6月15日（周四），下午 14:00 

　　地点：中科院上海硅酸盐研究所（嘉定园区）  青年公寓2楼会议室 

　　联系人：罗豪甦 （021-69987760）  

　　报告内容：For ultrasound transducer applications, nowadays, Pb(Zr_xTi_1-x)O₃ (PZT) ceramics has dominated the market for more than half century due to its very good piezoelectric properties. However, some emerging new piezoelectric materials are exhibiting potential to replace PZT in either high-end transducers or lead-free devices. One of the emerging new piezoelectric materials is relaxor Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ (PMN-PT)  based single crystals possessing much better performance than PZT, making it being used in some high-performance medical ultrasound imaging transducers. In this talk, recent development of PMN-PT single crystal-based medical ultrasound transducers in our group will be reviewed. Medical ultrasound transducers from a few MHz up to 100 MHz and from intravascular ultrasound transducer to high-frequency phase-array transducer for eye imaging have been fabricated in our group. Benefited from PMN-PT’s extremely large piezoelectric coefficient and electromechanical coupling factor (fabricated by Shanghai Institute of Ceramics), the bandwidth and sensitivity of the PMN-PT single crystal-based transducers have gained significant improvement.  

　　报告人简介：戴吉岩，香港理工大学应用物理系教授，1988毕业于复旦大学物理系，后获清华大学硕士学位，中科院博士学位。曾在美国西北大学材料科学与工程系做博士后研究，后任新加坡特许半导体公司主任工程师。2001年开始至今任教于香港理工大学应用物理系。戴吉岩教授是功能氧化物薄膜材料结构研究与器件制备方面的国际知名学者，并在新型材料用于医学影像的高频、宽带超声换能器的研制方面有所建树，并获颁多项专利。曾发表SCI论文200余篇，论文被他引4000多次。主持完成多项香港政府资助的科技公关项目，并主持国家973项目课题。 

　　欢迎广大科研人员和研究生参加！