A phase-field model of relaxor ferroelectrics based on random field theory
نویسندگان
چکیده
منابع مشابه
Field-induced percolation of polar nanoregions in relaxor ferroelectrics.
A first-principles-based effective Hamiltonian is used to investigate low-temperature properties of Ba(Zr,Ti)O(3) relaxor ferroelectrics under an increasing dc electric field. This system progressively develops an electric polarization that is highly nonlinear with the dc field. This development leads to a maximum of the static dielectric response at a critical field, E(th), and involves four d...
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In situ temperature-dependent Raman-scattering experiments under an external dc electric field E have been performed on (PST-Ba) in order to give further insights into the atomistic mechanism of polar coupling in perovskite-type (ABO 3) relaxor ferroelectrics near the intermediate characteristic temperature T ?. The polarized Raman spectra collected under an electric field E applied along the c...
متن کاملPreparation and Field-Induced Electrical Properties of Perovskite Relaxor Ferroelectrics
(111)-oriented and random oriented Pb0.8Ba0.2ZrO3 (PBZ) perovskite relaxor ferroelectric thin films were fabricated on Pt(111)/TiOx/SiO2/Si substrate by sol-gel method. Nano-scaled antiferroelectric and ferroelectric two-phase coexisted in both (111)-oriented and random oriented PBZ thin film. High dielectric tunability (i = 75%, E = 560 kV/ cm ) and figure-of-merit (FOM ~ 236) at room temperat...
متن کاملPhase Transitions in Relaxor Ferroelectrics
This paper covers the properties of relaxor ferroelectrics and considers the transition from the paraelectric state to the relaxor state comparing experimental data with the spherical random-bond randomfield model (SRBRF). It found that this model predicts and is experimental verifies a glassy state at the transition temperature for E < Ec and a ferroelectric state with quench random fields for...
متن کاملInfluence of Cation Order on the Electric Field-Induced Phase Transition in Pb(Mg1/3Nb2/3)O3-Based Relaxor Ferroelectrics
The effect of cation ordering on an electric field-induced relaxor to normal ferroelectric phase transition in Pb(Mg1/3Nb2/3)O3 (PMN)-based ceramics was investigated. Both A-site La doping and B-site Sc doping were found to enhance the chemical ordering in these relaxor ceramics. However, the enhanced chemical orderings showed different impacts on the dielectric and ferroelectric properties in ...
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ژورنال
عنوان ژورنال: International Journal of Solids and Structures
سال: 2016
ISSN: 0020-7683
DOI: 10.1016/j.ijsolstr.2016.01.007