CAJ | 학술논문

着重介绍了用Bridgman方法生长的(1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3(PMN-PT)固溶体单晶在介电、压电、热释电性能及相变方面的一些特点：①异常高的压电常数d33(高达3000pC/N以上)，耦合系数kt(在0.6以上)，k33(达0.90)，高的介电常数ε(高达5000甚至更高)，低的Qm值(约60)，热释电系数也较高. ②强烈的各向异性. ③随着PT含量的增加，系统的弛豫行为逐渐减弱，在x0.33时, 材料在室温下成为正常铁电体，但PE--FE相变并非正常铁电相变，表现为在T>Tm时,ε～T关系不遵守居里-外斯定律，而是遵守Smolenskii 的关系. 该相变也明显地与弥散相变不同. 这种行为可用无规场的观点加以解释. 对PMN-PT陶瓷，其压电性能与最好的软性PZT相似，而ε和k31略大.
착중개소료용Bridgman방법생장적(1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3(PMN-PT)고용체단정재개전、압전、열석전성능급상변방면적일사특점：①이상고적압전상수d33(고체3000pC/N이상)，우합계수kt(재0.6이상)，k33(체0.90)，고적개전상수ε(고체5000심지경고)，저적Qm치(약60)，열석전계수야교고. ②강렬적각향이성. ③수착PT함량적증가，계통적이예행위축점감약，재x0.33시, 재료재실온하성위정상철전체，단PE--FE상변병비정상철전상변，표현위재T>Tm시,ε～T관계불준수거리-외사정률，이시준수Smolenskii 적관계. 해상변야명현지여미산상변불동. 저충행위가용무규장적관점가이해석. 대PMN-PT도자，기압전성능여최호적연성PZT상사，이ε화k31략대.
Some special features in dielectric, piezoelectric properties and phase transition behavior of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) (x=0.24, 0.3, 0.33 and 0.35) single crystals grown by Bridgman method were outlined: 1) Extremely high piezoelectric constant d33 (up to 3000 pC/N) and coupling factors k33 and kt (up to 0.94 and 0.62 respectively), low mechanical factor of merit (Qm60), large dielectric constant (5000). 2) Strong orientation dependence of piezoelectric properties. 3) with increasing PT content, the system becomes less relaxational, but at least upto x=0.35, the system still partly exhibites relaxor feature: for x=0.33 and 0.35. ～T curves look sharp enough to show a normal ferroelectric like feature, however when T>Tm the ε～T relation does not obey Curie-Weiss law, but follows Smolenskii's relation.The piezoelectric properties of PMN-PT ceramics are similar to PZT-5H, but with higher and k31.