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首页> 外文期刊>Physical review, B >Labyrinthine domains in ferroelectric nanoparticles: Manifestation of a gradient-induced morphological transition
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Labyrinthine domains in ferroelectric nanoparticles: Manifestation of a gradient-induced morphological transition

机译：铁电纳米粒子的迷宫域：梯度诱导的形态过渡的表现

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摘要

In the framework of the Landau-Ginzburg-Devonshire (LGD) approach we studied finite-size effects of the phase diagram and domain structure evolution in spherical nanoparticles of a uniaxial ferroelectric. The particle surface is covered by a layer of screening charge characterized by finite screening length. The phase diagram, calculated in coordinates particle radius and screening length has a wide region of versatile polydomain structures separating single-domain ferroelectric and nonpolar paraelectric phases. Unexpectedly, we revealed a region of irregular labyrinthine domains in the nanoparticles of uniaxial ferroelectric CuInP2S6 with the first-order paraelectric-ferroelectric phase transition. We established that the origin of labyrinthine domains is the mutual balance of LGD, polarization gradient, and electrostatic energies. The branching of the domain walls appears and increases rapidly when the polarization gradient energy decreases below the critical value. Allowing for the generality of the LGD approach, we expect that the gradient-induced morphological transition can be the source of labyrinthine domain appearance in many spatially confined ferroics with long-range order parameter, including relaxors, ferromagnetics, antiferrodistortive materials, and materials with incommensurate ferroic phases.
机译：在Landau-Ginzburg-Devonshire（LGD）方法的框架中，我们研究了单轴铁电的球形纳米粒子中相图和域结构演化的有限效果。颗粒表面被一层筛分电荷覆盖，其特征在于有限筛分长度。在坐标颗粒半径和筛选长度中计算的相图具有分离单结构域铁电和非极性释电相的宽区域。意外地，我们揭示了单轴铁电CuinP2S6的纳米颗粒中的不规则迷宫结构域的区域，其中具有一流的近乙铁相转变。我们确定迷宫域的起源是LGD，偏振梯度和静电能的相互平衡。当极化梯度能量低于临界值时，畴壁的分支出现并迅速增加。允许LGD方法的一般性，我们预期梯度诱导的形态转换可以是迷宫域外观的许多空间狭窄的菲尔科，包括远程订单参数，包括松弛剂，铁磁，防冻反感性材料和具有不相称的材料铁阶段。

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