The pitfalls of empirical fitting of glass relaxation data with stretched exponents
The pitfalls of empirical fitting of glass relaxation data with stretched exponents
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DOI：
10.1063/1.5007056
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发表时间：
2018-02-14
影响因子：
3.2
通讯作者：
Atzmon, M.
中科院分区：
文献类型：
--
作者：
Atzmon, M.
拉伸指数通常用于拟合眼镜的实验弛豫数据，这些数据通常表现出一定的时间常数范围。虽然它已得到各种过程的理论支持，大部分是接近或高于玻璃化转变温度 T-g，但它也常用于低于 T-g 的唯象拟合，而无需机械模型。拉伸指数的性质以及金属玻璃的焓释放和动态机械响应的样本数据表明，在缺乏机械模型的情况下，拉伸指数拟合很容易导致伪影和有缺陷的结论。由 AIP 出版社出版。
A stretched exponent is commonly used to fit experimental relaxation data for glasses, which typically exhibit a range of time constants. While it has been supported by theory for various processes, mostly near and above the glass transition temperature, T-g, it is also commonly used in phenomenological fits below T-g without a mechanistic model. The properties of the stretched exponent, and sample data for the enthalpy release and dynamic-mechanical response of metallic glasses, are used to show that in the absence of a mechanistic model, stretched-exponent fits easily lead to artifacts and flawed conclusions. Published by AIP Publishing.