Equations of State of Solid CO2 Phases at Megabar Pressures

被引：1
|
作者：
Litasov, K. D. [1 ]
Brazhkin, V. V. [1 ]
Sagatov, N. E. [1 ,2 ]
Inerbaev, T. M. [1 ,3 ]
机构：
[1] Russian Acad Sci, Vereshchagin Inst High Pressure Phys, Troitsk 108840, Moscow, Russia
[2] Novosibirsk State Univ, Novosibirsk 630090, Russia
[3] Gumilyov Eurasian Natl Univ, Astana 010008, Kazakhstan
来源：
JETP LETTERS | 2024年 / 119卷 / 03期
关键词：
TOTAL-ENERGY CALCULATIONS; CARBON-DIOXIDE; THERMOELASTIC PROPERTIES; NONPRIMITIVE LATTICES; PERFECT CRYSTALS;
D O I：
10.1134/S0021364023604165
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The stability of CO2 phases at pressures up to 1600 GPa is confirmed using evolution methods for predicting crystal structures. Stable CO2 phases are as follows: I(-)42d (to 279 GPa), P4(2)/nmc (279-952 GPa), Pbcn(952-1018 GPa), and (above 1018 GPa). The equations of state for stable CO2 phases up to pressures of about 1600 GPa are calculated for the first time using ab initio methods and high-temperature calculationswithin the quasi-harmonic approximation. It is shown that high-pressure (P4(2)/nmc, Pbcn and Pa3(-) phases have rather high bulk moduli (290-415 GPa). Phases with sixfold coordination of carbon atoms (P4(2)/nmc, Pbcn and Pa3(-)) have higher coefficients of thermal expansion in comparison with the P4(2)/nmc phase.
引用
收藏
页码：205 / 210
页数：6
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