摘要
研究了准同型相界附近组分的Ｐｂ（Ｍｇ１／３Ｎｂ２／３）Ｏ３－ＰｂＴｉＯ３铁电晶体〈００１〉方向的介电、弹性、压电和热电性质。室温时压电应变常数ｄ３３约为８００ｐＣ／Ｎ。在２００Ｋ～３６０Ｋ的温度范围内，机电耦合系数ｋｔ约为０．５３，近似为一常数。而压电应力常数ｅ３３和热释电系数ｐ３随着温度的上升而单调地增大，弹性刚度常数ｃＤ３３却逐渐减小。其铁电相变的弥散性程度很高，介电临界指数γ为１．８８。
Dielectric, elastic, piezoelectric and pyroelectric properties of Pb(Mg 1/3 Nb 2/3 )O 3 PbTiO 3 crystal near the morphotropic phase boundary in the direction of 〈001〉 have been investigated. At room temperature, the piezoelectric strain constant d 33 ≈800 PC/N.Within 200 K～360 K,the electromechanical coupling coefficient k t is about a constant 0.53,the piezoelectric stress constant e 33 and the pyroelectric coeficient p 3 increases but the elastic stiffness constant c D 33 decreases while the temperature rising. The dielectric critical exponents =1.88,indicating that the ferroelectric phase transition is highly diffusive.
出处
《压电与声光》
CAS
CSCD
北大核心
1999年第1期68-71,共4页
Piezoelectrics & Acoustooptics
关键词
铁电晶体
弥散性铁电相变
压电性
ferroelectric crystal
diffusive ferroeceltric phase transition
piezoelectric
