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《Transactions of Materials and Heat Treatment》 2007-03
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Dielectric and piezoelectric properties of PMN-PT ceramics near the morphotropic phase boundary

CAO Lin-hong~1,YAO Xi~2,XU Zhuo~2(1.Sichuan Province Key Laboratory of Advanced Construction Materials,Southwest University of Science and Technology,Mianyang 621010,China;2.Electronic Materials Research Laboratory,Xi'an Jiaotong University,Xi'an 710049,China)  
Relaxor ferroelectric(1-x) Pb(Mg_(1/3)Nb_(2/3))O_3-x PbTiO_3 ceramics near the morphotropic phase boundary were prepared by the columbite precursor method.The phase composition and phase structure of ceramic samples were investigated by X-ray diffraction analysis.The results show that pure perovskite phase is obtained for all the specimens and no other phase is detected.Moreover,there exists a morphotropic phase boundary(MPB) for the composition at x=0.33mol,and the rhombohedra phase and tetragonal phase coexists for the composition near MPB, but the pure rhombohedra phase and tetragonal phase separately exists for the composition away from MPB.Furthermore,the ceramics near MPB exhibits excellent dielectric and piezoelectric properties,such as ε_m~38000,E_c~5 kV/cm,P_r~31.5 μC/cm~2,d_(33)~500 pC/N.This is mainly ascribed to macroscopic coexistence of rhombohedra phase and tetragonal phase,or microcosmic coexistence of microdomain and macrodomain.
【Fund】: 国家自然科学基金资助(50472052 10474077)
【CateGory Index】: TM282
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