论文部分内容阅读
相比较于传统的Pb(Zr_(1-x)Ti_x)O_3(PZT)多晶压电陶瓷,弛豫铁电单晶具有超高的机电耦合系数和压电系数.例如,典型的Pb(Zn_(1/3)Nb_(2/3))O_3-PbTiO_3(PZN-PT)和Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3(PMN-PT)弛豫铁电单晶,其机电耦合系数k_(33)>0.9,压电系数d_(33)>2000 pC/N,使其有潜力应用于下一代压电器件,如传感器、声呐、执行器等.但是弛豫铁电单晶应用的关键在于单晶的制备问题.弛豫铁电单晶的制备技术包括高温溶液法(助溶剂法)、垂直坩埚下降法和顶部籽晶法.顶部籽晶法在制备弛豫铁电单晶时具有很多优势.因此,本文将阐述顶部籽晶法制备弛豫铁电单晶的最新进展.
Compared with the conventional Pb (Zr 1-x) Ti_xO_3 (PZT) polycrystalline piezoelectric ceramics, relaxed ferroelectric single crystals have very high electromechanical coupling coefficient and piezoelectric coefficient.For example, typical Pb (Zn_ (1/3) Nb_ (2/3)) O_3-PbTiO_3 (PZN-PT) and Pb (Mg_ (1/3) Nb_ (2/3)) O_3-PbTiO_3 (PMN-PT) Its electromechanical coupling coefficient k_ (33)> 0.9 and its piezoelectric coefficient d_ (33)> 2000 pC / N make it potentially useful for next generation piezoelectric devices such as sensors, sonars, actuators, The key to the electric single crystal application lies in the preparation of single crystal.The preparation techniques of relaxation ferroelectric single crystal include the high temperature solution method (cosolvent method), the vertical crucible drop method and the top seed method.The top seed method in the preparation of relaxation Ferroelectric single crystal has many advantages.Therefore, this article will describe the top of the latest developments in the preparation of relaxed ferroelectric single crystal seed law.