نتایج جستجو برای: pbtio3
تعداد نتایج: 687 فیلتر نتایج به سال:
We calculate from first principles the nonlinear piezoelectric response of ferroelectric PbTiO3 for the case of a polarization-enhancing electric field applied along the tetragonal axis. We focus mainly on the case of fixed in-plane lattice constants, corresponding to epitaxially constrained thin films. We find that the dependence of the c /a ratio on electric field is almost linear in the rang...
A promising approach for obtaining a large magnetoelectric response at room temperature in single-phase materials is to make use of phase-change phenomena structural instabilities multiferroic state. This the case perovskites showing morphotropic phase boundary (MPB) between ferroelectric polymorphs with differentiated magnetic orderings, like BiFeO3–PbTiO3. Indeed, distinctive effects were rec...
Ferroelectric lead zirconate titanate Pb(Zr,Ti)O3 (PZT) films were deposited on ITO/glass substrates by chemical solution deposition (CSD) technique with processing temperature below the grass-transition point. (100)c-oriented PZT successfully grown buffer layer of calcium niobate Ca2Nb3O10 nanosheets (ns-CN), together enhanced crystallinity increasing PbTiO3 content in PbZrO3–PbTiO3 system, i....
Thermodynamics of ferroelectric materials and their to paraelectric (FE-PE) transitions including those in PbTiO3 is commonly described by the phenomenological Landau theory more recently effective Hamiltonian various potentials, all with model parameters fitted experimental or theoretical data. Here we show that zentropy theory, which considers total entropy a system as weighted sum entropies ...
Direct measurement of the remanent polarization of high quality (001)-oriented epitaxial BiFeO3 thin films shows a strong strain dependence, even larger than conventional (001)-oriented PbTiO3 films. Thermodynamic analysis reveals that a strain-induced polarization rotation mechanism is responsible for the large change in the out-of-plane polarization of (001) BiFeO3 with biaxial strain while t...
In this work, using the state-of-the-art first-principles calculations based on density functional theory, we found that concentration and coordination of surface oxygen vacancies with respect to each other were critical for direct water-splitting reaction (001) surfaces PbTiO3 TiO2. For happen TiO2-terminated surfaces, it is necessary have two neighboring O acting as active sites host adsorbin...
The phase diagram of the Pb(Lu0.5Nb0.5)O3-PbTiO3 (PLN-PT) binary system was previously reported based on XRD and dielectric measurements results. Unusually, the Curie temperature of PLN-PT with low PT obtained from the phase diagram is much lower than that of PLN and PT end members, which is different from others, such as PZT. Therefore, the complex structure of PLN-PT with low PT is desired to...
Ferroelectric oxides, such as lead zirconate titanate, have proved invaluable due to their excellent dielectric and piezoelectric properties. These classes of materials possess a large electric polarization below the Curie temperature. Regions of the crystal lattice having different directions of polarization are separated by nano-scale interfaces known as domainwalls. These interfaces, which c...
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