Thermal Expansion Behaviors of Li3AsW7O25: A Case Study for Comparative Debye Temperature for a Large Polyatomic Unit Cell

Thermal Expansion Behaviors of Li3AsW7O25: A Case Study for Comparative Debye Temperature for a Large Polyatomic Unit Cell
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Li3AsW7O25 的热膨胀行为:大型多原子晶胞比较德拜温度的案例研究

DOI:
10.1002/zaac.201700330
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发表时间:
2018
期刊:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
T. Gesing
T. Gesing
中科院分区:
--
文献类型:
--
作者:
M. Murshed;P. Zhao;A. Huq;T. Gesing

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研究了Li3AsW7O25的热膨胀行为。利用中子飞行时间粉末衍射数据对晶体结构参数进行Rietveld修正,得到晶体结构参数随温度的变化规律。晶格热膨胀的模拟采用零压状态方程的Grüneisen一级近似,其中随温度变化的振动能采用德拜-爱因斯坦-非谐性方法计算。随温度变化的拉曼光谱揭示了一些具有异常非谐性的选择性模式。用三种不同的理论方法计算了德拜温度,即热膨胀、均方各向同性原子位移参数和热容。讨论了不同理论方法得到的数值之间的异同。
The thermal expansion behavior of Li3AsW7O25 has been studied. The temperature-dependent development of crystal structural parameters was obtained from Rietveld refinement using neutron time of flight powder diffraction data. Modeling of the lattice thermal expansion was carried out using a Grüneisen first-order approximation for the zero-pressure equation of state, where the temperature-dependent vibrational energy was calculated taking the Debye-Einstein-Anharmonicity approach. Temperature-dependent Raman spectra shed light on some selective modes with unusual anharmonicity. Debye temperatures were calculated using three different theoretical approaches, namely, thermal expansion, meansquared isotropic atomic displacement parameter and heat capacity. Similarities as well as discrepancies between the numerical values obtained from different theoretical approaches are discussed.
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