Transition between the ferroelectric and relaxor states in 0.8Pb(Mg1/3Nb2/3)O-3-0.2PbTiO(3) ceramic - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2006

Transition between the ferroelectric and relaxor states in 0.8Pb(Mg1/3Nb2/3)O-3-0.2PbTiO(3) ceramic

Résumé

The phase transition between the ferroelectric and relaxor states for 0.8Pb(Mg1/3Nb2/3)O-3-0.2PbTiO(3) ceramics with high chemical homogeneity has been studied by measurements of the dielectric and elastic properties as a function of temperature and of thermal expansion. The room temperature ferroelectric phase structure has been studied in ceramics and powdered samples by Rietveld analysis of x-ray diffraction patterns and by ferroelectric hysteresis loops. Results indicate that the material has well defined, different transition and freezing temperatures, such as the transition is between a monoclinic Cm ferroelectric phase and the nonergodic glass state. The transition presents thermal hysteresis, not only in the transition temperature, but in the kinetics. This indicates that a quite sharp slowing down occurs in the temperature interval between 334 and 344 K: the transition temperatures on cooling and heating.
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Dates et versions

hal-00133277 , version 1 (24-02-2007)

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J. Carreaud, Brahim Dkhil, M. Kosec, R. Jimenez, B. Jimenez, et al.. Transition between the ferroelectric and relaxor states in 0.8Pb(Mg1/3Nb2/3)O-3-0.2PbTiO(3) ceramic. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 74, pp.184106. ⟨10.1103/PhysRevB.74.184106⟩. ⟨hal-00133277⟩
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