相变材料的表面诱导结晶/非晶化。

IF 2.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Nanotechnology Pub Date : 2025-01-15 DOI:10.1088/1361-6528/ada568
Mahdi Javanbakht, Sajjad Mohebbi, Hamed Attariani
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引用次数: 0

摘要

采用相场模型研究了锗锑碲(GST)纳米层的表面诱导结晶/非晶化。金兹堡-朗道(GL)方程引入了外面层(ESL),在该外面层内表面能和弹性性能得到了合理的分布。其次,求解了结晶/非晶化的GL和弹性耦合方程。对于初始表面晶核,当晶核宽度Δ≥2时,晶核沿晶核方向出现非物理结晶,当晶核宽度Δ≤1时,晶核沿晶核方向出现椭圆形生长。ESL导致表面核的生长速度比尖锐表面模型快,但不影响体内的结晶速率。初始均质条件导致在体中和后来在ESL中同时结晶。研究了非晶化过程中的ESL效应,以更精确地确定ESL宽度。在初始非晶核和均匀核条件下,非晶化温度从尖表面模型下降到Δ = 0.5时的ESL模型,然后在较大Δ时几乎保持不变。综合以上结果得出0.5≤Δ≤1为ESL宽度的合适范围。有效ESL宽度的比值界面宽度(∆⁄Δ)的比率之间的区别的表面能量转换阶段的表面能初始阶段(Δ⁄)是至关重要的参数在确定ESL影响相位变换和线性关系∆⁄Δ≅6.235Δ⁄发现基于当前和以前的作品可用于估算有效的任何表面诱导ESL宽度转换强生# xD。
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Surface induced crystallization/amorphization of phase change materials.

Surface-induced crystallization/amorphization of a Germanium-antimony-tellurium nanolayer is investigated using the phase field model. A Ginzburg-Landau (GL) equation introduces an external surface layer (ESL) within which the surface energy and elastic properties are adequately distributed. Next, the coupled GL and elasticity equations for the crystallization/ amorphization are solved. For the initial surface crystalline nucleus, unphysical crystallization along the ESL appears for the ESL widthΔξ⩾2nmwhile oval growth occurs forΔξ⩽1nm. The ESL results in a faster surface nucleus growth than the sharp surface model but does not affect the crystallization rate inside the bulk. Initial homogeneous conditions cause a simultaneous crystallization in the bulk and later in the ESL. The ESL effect on amorphization is studied to determine the ESL width more precisely. For both the initial amorphous nucleus and homogenous conditions, the amorphization temperature shows a reduction from the sharp surface model to the ESL model withΔξ=0.5nmand then remains almost constant for largerΔξ. Combining the above results gives0.5⩽Δξ⩽1nmas a proper range for the ESL width. The ratio of the effective ESL width to the interface width (Δsat/Δη) and the ratio of the difference between the surface energies of transforming phases to the surface energy of the initial phase (Δγ/γin) are considered crucial parameters in determining the ESL effect on the phase transformation and a linear relation asΔsat/Δη≅6.235Δγ/γinis found based on current and previous works, which can help estimate the effective ESL width for any surface-induced transformations.

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来源期刊
Nanotechnology
Nanotechnology 工程技术-材料科学:综合
CiteScore
7.10
自引率
5.70%
发文量
820
审稿时长
2.5 months
期刊介绍: The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.
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