Predicting finite-temperature properties of crystalline carbon dioxide from first principles with quantitative accuracy.

Predicting finite-temperature properties of crystalline carbon dioxide from first principles with quantitative accuracy.
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DOI:
10.1039/c5sc03014e
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发表时间:
2016-01-01
期刊:
影响因子:
8.4
通讯作者:
Beran GJO
Beran GJO
中科院分区:
化学1区
文献类型:
--
作者:
Heit YN;Nanda KD;Beran GJO

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The temperature-dependence of the crystalline carbon dioxide (phase I) structure, thermodynamics, and mechanical properties are predicted in excellent agreement with experiment over a 200 K temperature range using high-level electronic structure calculations. Molecular crystal structures, thermodynamics, and mechanical properties can vary substantially with temperature, and predicting these temperature-dependencies correctly is important for many practical applications in the pharmaceutical industry and other fields. However, most electronic structure predictions of molecular crystal properties neglect temperature and/or thermal expansion, leading to potentially erroneous results. Here, we demonstrate that by combining large basis set second-order Møller–Plesset (MP2) or even coupled cluster singles, doubles, and perturbative triples (CCSD(T)) electronic structure calculations with a quasiharmonic treatment of thermal expansion, experimentally observable properties such as the unit cell volume, heat capacity, enthalpy, entropy, sublimation point and bulk modulus of phase I crystalline carbon dioxide can be predicted in excellent agreement with experiment over a broad range of temperatures. These results point toward a promising future for ab initio prediction of molecular crystal properties at real-world temperatures and pressures.
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