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Field-induced dielectric singularity, critical exponents, and high-dielectric tunability in [111]-oriented (1-x) Pb (Mg1/3 Nb2/3) O3 -xPbTi O3 (x=0.24)
Lu S.G.; Xu Z.; Chen H.
2005-08-01
Source PublicationPhysical Review B - Condensed Matter and Materials Physics
ISSN10980121 1550235X
Volume72Issue:5
AbstractThe temperature dependence of permittivity in [111]-oriented 0.76PMN-0.24PT single crystal revealed dielectric singularity between 0 and 100°C under a dc bias field (Edc). By fitting the singular permittivity-temperature characteristics under increasing dc bias fields, it was found that the critical exponent γ, is a function of Edc and increased from 0.2 to 0.8 at Edc ≤150 kV m, to 1.22 at Edc =175 kV/m, which is approaching the value of the three-dimensional (3D) Ising model (1.25), and then to 1.84 at Edc =200 kV/m, close to the value of the 3D random-field Ising model (1.97). The maximum tunability of 80% was obtained at the temperature when a relaxor ferroelectric (RF) to normal ferroelectric (FE) phase transition occurs. On the other hand, the maximum tunability was only 25% at the temperature when a paraelectric (PE) to RF phase transition occurs. In addition, the PE-RF transition temperature Tmax was almost independent of the dc field, whereas the RF-FE transition temperature Td had a relation of Td ∼ E2/3 at E>50 kV/m. © 2005 The American Physical Society.
DOI10.1103/PhysRevB.72.054120
URLView the original
Language英語
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Cited Times [WOS]:9   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
AffiliationCity University of Hong Kong
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Lu S.G.,Xu Z.,Chen H.. Field-induced dielectric singularity, critical exponents, and high-dielectric tunability in [111]-oriented (1-x) Pb (Mg1/3 Nb2/3) O3 -xPbTi O3 (x=0.24)[J]. Physical Review B - Condensed Matter and Materials Physics,2005,72(5).
APA Lu S.G.,Xu Z.,&Chen H..(2005).Field-induced dielectric singularity, critical exponents, and high-dielectric tunability in [111]-oriented (1-x) Pb (Mg1/3 Nb2/3) O3 -xPbTi O3 (x=0.24).Physical Review B - Condensed Matter and Materials Physics,72(5).
MLA Lu S.G.,et al."Field-induced dielectric singularity, critical exponents, and high-dielectric tunability in [111]-oriented (1-x) Pb (Mg1/3 Nb2/3) O3 -xPbTi O3 (x=0.24)".Physical Review B - Condensed Matter and Materials Physics 72.5(2005).
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