Phase Transition and Relaxor Behaviors in the Lead Magnesium Niobate-based Ferroelectrics
Pb(Mg1/3Nb2/3)O3-based 강유전체의 상전이 및 완화특성

Y.J. Kim, J.H. Lee
2008 Applied Science and Convergence Technology  
Dielectric and pyroelectric properties of relaxor ferroelectric in the PMN-PT solid solution series have been investigated. Features of the diffuse phase transition in PMN-PT system, typical relaxor ferroelectric materials, were studied as a function of temperature and frequency. The transition temperature of the ceramics with PT~0.325 did not depend on the measuring frequency. This can best realized in a relatively random environment that apparently is provided by PMN-rich complex perovskites,
more » ... omplex perovskites, including those containing Pb. The composition with PT>0.35 show the characteristics of a normal single phase ferroelectric material. Thus the studies revealed that the morphotropic phase boundary in the PMN-PT system is in the vicinity of PT~0.3 and it has a small curvature and as a result the compositions near the morphotropic phase boundary show two phase transitions, rhombohedral→tetragonal→cubic, when the samples are heated up to higher temperature. The best optimum compositions are observed near the morphotropic phase boundary.
doi:10.5757/jkvs.2008.17.2.148 fatcat:asj5obkzfbcanihai2lp347zsm