نتایج جستجو برای: ferroelectric materials
تعداد نتایج: 443347 فیلتر نتایج به سال:
We have investigated the ferroelectric polarization switching properties of trialkylbenzene-1,3,5-tricarboxamide (BTA), which is a model system for a large class of novel organic ferroelectric materials. In the solid state BTAs form a liquid crystalline columnar hexagonal phase that provides long range order that was previously shown to give rise to hysteretic dipolar switching. In this work th...
We discuss the behaviour of a model of ferroelectric material represented by a thin cylinder with small thickness ν > 0. This model is described by a couple of Maxwell equations satisfied by the electromagnetic field (H,E) and electric polarization field P . We give a complete description of the limit model as ν → 0 in the linear case when (E,H) and P satisfy a SilverMüller type boundary condit...
We discuss rate-independent engineering models for multi-dimensional behavior of ferroelectric materials. These models capture the non-linear and hysteretic behavior of such materials. We show that these models can be formulated in an energetic framework which is based on the elastic and the electric displacements as reversible variables and interior, irreversible variables like the remanent po...
The investigation of the finite-size effect in ferroelectric crystals and films has been limited by the experimental conditions. The smallest demonstrated ferroelectric crystals had a diameter of 200 A and the thinnest ferroelectric films were 200 A thick, macroscopic sizes on an atomic scale. Langmuir ± Blodgett deposition of films one monolayer at a time has produced high quality ferroelectri...
The interactions between electrons and lattice vibrations are fundamental to materials behaviour. In the case of group IV-VI, V and related materials, these interactions are strong, and the materials exist near electronic and structural phase transitions. The prototypical example is PbTe whose incipient ferroelectric behaviour has been recently associated with large phonon anharmonicity and the...
Organolead trihalide perovskite (OTP) materials are emerging as naturally abundant materials for low-cost, solution-processed and highly efficient solar cells. Here, we show that, in OTP-based photovoltaic devices with vertical and lateral cell configurations, the photocurrent direction can be switched repeatedly by applying a small electric field of <1 V μm(-1). The switchable photocurrent, ge...
We consider Ginzburg-Landau energy for ferroelectric materials so as to study their structures during the polarization reversal process by an externally applied electric field. We accomplish very useful mathematical results which connect this problem with other situations in material sciences. Taking into account the Neumann boundary condition, we obtain inhomogeneous solutions and study hyster...
Multiferroic La-doped BiFeO3 thin films have been prepared by a sol-gel plus spin-coating process, and the local magnetoelectric coupling effect has been investigated by the magnetic-field-assisted scanning probe microscopy connected with a ferroelectric analyzer. The local ferroelectric polarization response to external magnetic fields is observed and a so-called optimized magnetic field of ~4...
In this paper Mode I steady state crack growth in single crystal ferroelectric materials is investigated. Specifically, the fracture toughness enhancement due to domain switching near a steadily growing crack tip is analyzed. For this purpose, an incremental phenomenological constitutive law for single crystal ferroelectric materials is implemented within a finite element model to calculate the...
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