Ferroelectric Properties and Transmission Response ofPZN-PT Single Crystals for Underwater Communication

Defence Science Journal

G. Madeswaran¹  K. Trinath²  J. Bubesh Babu¹  N.S. Prasad²  A.V.N.R. Rao²  I.R. Abisekaraj²  R. Dhanasekaran¹ 

[1] Crystal Growth Centre, Anna University, Chennai;Naval Science and Technological Laboratory

关键词: Crystal growth;    sonar;    piezoelectric coefficient;    transducer;    underwater communication;    PZN-PT single crystal;    electromechanical coupling factor;    dielectric constant;    ferroelectricconstant;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Single crystal of Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (PZN-PT) at the composition of morphotropicphase boundary (MPB) shows a very high electromechanical coupling coefficient, piezoelectriccoefficient, and dielectric constant compared to conventional PZT ceramics. These exceptionalproperties of these single crystals find enormous applications in medical ultrasound imaging andunderwater communication (Sonar). The growth of PZN-PT single crystals has been carried outby bottom-supported flux Bridgman method. There are many growth issues to be addressedduring the process of growth. The grown crystals are oriented and cut along <001> directionwith the crystal dimension of 8 x 6 x 1.5 mm3 for further analysis. The oriented crystals were poledat a rate of 1 kV/mm. The poled crystals have been characterised for dielectric, strain andpiezoelectric values. Further, the poled specimen were tested for transmitting response at variousfrequencies in acoustic test facility and the difficulties in their growth.

【 授权许可】

Unknown