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Current position:Home >New > MICROSTRUCTURE AND ELECTRICAL RESPONSE OF 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 RELAXOR CERAMICS

MICROSTRUCTURE AND ELECTRICAL RESPONSE OF 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 RELAXOR CERAMICS

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Ceramic samples of a solid solution of 10 mol.% leadtitanate PbTiO3 (PT) in lead magnesium niobate Pb(Mg1/3Nb2/3)O3 (PMN) wereinvestigated from the view-point of phase transition behavior and electricalproperties. Dielectric spectroscopy in a frequency region of 102 - 106 Hz wascarried out to study the temperature and frequency dependence of the weak-fielddielectric response in 0.9PMN-0.1PT material prepared via a columbite precursorroute. The temperature Tm of the observed maxima in the dielectric permittivity(em) was found to shift from 45.4 to 58.5_C andem decreased from 4500 to 4060as the frequency increased from 100 Hz to 1 MHz. The characteristics of adiffuse phase transition (DPT) behavior (g »1.8 and dg »30_C) weredetermined using an extended Curie-Weiss law. The relaxor features offerroelectrics were also demonstrated by a "slim" ferro-electrichysteresis loop. Non-zero values of the piezoelectric parameters (kp »1.6%, d31 »-3.6 pC/N) and spontaneous polari-zation (Ps »2.4 µC/cm2)were observed at 80_C, indicating the existence of nanopolar regions in thestructure far above the Tm.

 

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