Title :
Phases in relaxor ferroelectric crystals
Author :
Schmidt, V.Hugo ; Tu, Chi-Shun ; Cheng, B.-C.
Author_Institution :
Dept. of Phys., Montana State Univ., Bozeman, MT, USA
Abstract :
The dielectric permittivity and domain structures have been measured as a function of temperature in relaxor ferroelectric single crystals (PbMg1/3Nb2/3O3)1-x(PbTiO 3)x (PMN-xPT) for x=0.31 and 0.34. Both PMN-31%PT and PMN-34%PT crystals show complex dielectric and domain configurations with coexistence of trigonal and tetragonal symmetries in a wide temperature region. In addition, both crystals exhibit another narrower coexistence of tetragonal and cubic symmetries in the higher temperature region. It was found that different individual regions of the same phase have different transition temperatures. This phenomenon suggests an inhomogeneous distribution of Ti+4 concentration in the crystals
Keywords :
electric domains; ferroelectric materials; ferroelectric transitions; lead compounds; permittivity; PMN-PT; PMN-PbTiO3; PbMgO3NbO3-PbTiO3; cubic symmetry; dielectric permittivity; domain structure; phase transition temperature; relaxor ferroelectric single crystal; tetragonal symmetry; trigonal symmetry; Crystals; Dielectric measurements; Ferroelectric materials; Frequency; Iron; Microscopy; Optical polarization; Physics; Relaxor ferroelectrics; Temperature;
Conference_Titel :
Applications of Ferroelectrics, 2000. ISAF 2000. Proceedings of the 2000 12th IEEE International Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
0-7803-5940-2
DOI :
10.1109/ISAF.2000.941556
