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Phase field crystal based prediction of temperature and density dependence of elastic constants through a structural phase transition

机译:基于结构阶段通过结构相转变的弹性常数温度和密度依赖性的相晶

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摘要

Explicit, analytical forms are obtained for the elastic constants arising from the phase field crystal (PFC) model in which the dependence of the constants on proxies for the temperature and density in the PFC model is clearly exhibited. The expressions indicate that the elastic constants are multivalued in certain temperature ranges corresponding to regions where two or more phases coexist, in agreement with experimental observations. The analytical formulas for the variation of the elastic constants with density agree with those obtained using a computational approach in [Wang, Huang, and Liu, Phys. Rev. B 97, 144112 (2018)] but only in certain regimes. Specifically, if it is assumed that only the bcc state is present, then our formulas agree with the numerical results presented in [Wang, Huang, and Liu, Phys. Rev. B 97, 144112 (2018)]. In general, the bcc state is not the only phase present and, if other phases are taken into account, then the results differ in those regions where alternative states are favored energetically. Similar conclusions hold if one looks at temperature dependence instead of density variation.
机译:用于从相场晶体(PFC)模型产生的弹性常数获得显式的分析形式,其中常数在PFC模型中温度和密度的代理上的依赖性明显表现出来。表达表明,弹性常数在某些温度范围内多值,其对应于两个或更多个相位共存的区域与实验观察。具有密度的弹性常数变化的分析公式与在[王,黄,刘,物理中的计算方法获得的那些。 Rev. B 97,14112(2018)]只在某些制度中。具体地,如果假设只存在BCC状态,则我们的公式同意[王,黄,刘,物理中的数值结果。 Rev. B 97,14112(2018)]。通常,BCC状态不是存在的唯一阶段,并且如果考虑其他阶段,则结果在替代国家在能源上有利的那些地区不同。类似的结论如果一个人看温度依赖而不是密度变异。

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  • 来源
    《Physical review》 |2019年第10期|104101.1-104101.11|共11页
  • 作者

    Ainsworth Mark; Mao Zhiping;

  • 作者单位

    Brown Univ Div Appl Math 182 George St Providence RI 02912 USA;

    Brown Univ Div Appl Math 182 George St Providence RI 02912 USA;

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  • 正文语种 eng
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