Domain Structure And Piezo-electrical Properties Of PMN-0.33PT Single Crystals

In the recent years, Pb(Mg1/3Nb2/3)O3-x Pb Ti O3(PMN-x PT) single crystal exhibit excellent piezoelectric property compared with the traditional PZT ceramics which is dominant in the last 50 years. The high electrical and mechanical properties have atract more and more researchers.Much more relaxor ferroelectric single crystals were grown, which have unique piezoelectric properties.Different component proportion of PMN-x PT has the very big difference, especially PMN-x PT whichis near the morphotropic phase boundary, has high piezoelectric properties relative to other components. But its so high piezoelectric sources have been the forefront of international academic research. Most of researchers recognize its special domain structure is one of themost important factors of the giant piezoelectric.This paper studied the dielectric, ferroelectric and domain structure by polarizing light microscope(PLM) and microscopic domain structure by piezoresponse force microscopy(PFM) of PMN-0.33 PT crystals, which are at different temperatures. And identify their temperature of ferroelectric-ferroelectric phase transformation and ferroelectric-paraelectric phase transition, discuss the relaxation source, domain structure change and phase change process through macroscopic domain and microscopic domain in response with temperatue.The polarization process is explored by displacement current in response with electric field intensity. The PMN-0.33 PT crystal domain change with electric field intensity and temperatue is in-situ observed by PLM, The change rule is analysed by domain walls and extinction angles.The PMN-0.33 PT crystal microscopic domain change with electric field intensity and temperatue is observed by PFM. The microscopic domain structure and change rule is discussed. Finally the piezoelectric property of PMN-0.33 PT crystal with electric field intensity and temperatue is in-situ measured by 31 piezoelectric vibrators. The relevance between domain structure and piezoelectric property is investigated. This research provided the reference for the the ideal polarization condition.This paper provided experimental data for exploring the giant piezoelectric sources, and will promote the application of domain engineer and the relevance research between domain structures and piezoelectric property.