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arXiv 1202.1626cond-mat.mtrl-sciphysics.chem-ph
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各向异性凝聚应变下的相分离

Phase Separation with Anisotropic Coherency Strain

Liam G. Stanton, Martin Z. Bazant

摘要:

我们考虑各向异性相干应变(由于晶格失配)的影响,在嵌入材料的相分离,高倍率锂离子电池材料\fepo的动机。使用相场模型耦合到弹性应力,我们分析了旋节分解(线性不稳定的均匀状态),以及在恒定的平均填充的相位图案的非线性演化。我们认为完全各向异性的相干应变,并专注于新的情况下,同时膨胀和收缩沿不同的晶轴,在\fepo的情况下,这导致倾斜,条纹相边界平衡。

英文摘要:

We consider the effects of anisotropic coherency strain (due to lattice mismatch) on phase separation in intercalation materials, motivated by the high-rate Li-ion battery material \fepo. Using a phase-field model coupled to elastic stresses, we analyze spinodal decomposition (linear instability of the homogeneous state) as well as nonlinear evolution of the phase pattern at constant mean filling. We consider fully anisotropic coherency strain and focus on the novel case of simultaneous expansion and contraction along different crystal axis, as in the case of \fepo, which leads to tilted, striped phase boundaries in equilibrium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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