四方相铌镁酸铅-钛酸铅(PMN-PT)铁电单晶的弹性、介电、压电和机电性能  

Elastic, Dielectric, Piezoelectric and Electromechanical Properties of Tetragonal Pb(Mg_1/3Nb_2/3)O_3-PbTiO_3 (PMN-PT)

作　　者：曹虎[1] 方必军[1] 徐海清[1] 罗豪甦[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海嘉定201800

出　　处：《无机材料学报》2003年第2期465-469,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(59995520);上海市基金(005207015)

摘　　要：研究了四方相弛豫铁电单晶Pb(Mg1/3Nb2/3)O3-38％PbTiO3(PMNT62/38)的介温特性,并利用HP4192A阻抗分析仪测量了PMNT62/38单晶完整的一套弹性、介电、压电和机电耦合系数,为理论研究和器件设计提供了参考,其居里点Tc～174℃;压电应变常量d33～300pC/N;介电常数C33～734,ε11～4301;机电耦合因数k33～84.6％,kt～60.8％,k31～44.5％,k15～45.9％.Relaxor ferroelectric single crystal Pb(Mg1/3Nb2/3)O-3-38%PbTiO3 (PMNT62/38) was grown directly from melt by a modified Bridgman technique. The XRD analysis confirms that PMNT62/38 single crystal has a tetragonal structure at room temperature. The epsilon(r) - T peak at T-c and little dispersion over measured temperature range indicate that the PMNT62/38 single crystal is a normal ferroelectric. The full set of electromechanical properties was determined by using an impedance resonance technique, the Curie temperature being about 174degreesC, piezoelectric constant d(33) similar to300pC/N, and permittivity epsilon(33) similar to734 and epsilon(11) similar to4301. Electric-mechanical coupling coefficients measured axe k(33) 84.6%, k(t) 60.8%, k(31) 44.5% and k(15) 45.9%.

关 键 词：PMN-PT单晶 弹性 介电 压电和机电耦合系数 谐振-反谐振法 

分 类 号：O738[理学—晶体学]