Paper Info
Title
Study of high-pressure and high-temperature behaviors and α-to-β phase transition of forsterite by first-principles and quasi-harmonic Debye model
Abstract
The high-pressure and/or high-temperature behavior and α/β phase transition of forsterite (Mg2SiO4) were investigated by first principle calculations: local density approximation (LDA), generalized gradient approximation (GGA) and the quasi-harmonic Debye model in consideration of the temperature effect. At zero pressure and zero temperature, the calculated values of lattice parameters and elastic constants are well concordant with experimental data. The calculated values of cell volume at different pressures and temperatures are compatible with experiments. The results calculated by LDA are more concordant with the experimental results than those by GGA for describing Mg2SiO4 crystals. The boundaries of the P–T plots for α/β phase transition are calculated to be 0.00779 GPa/K by LDA and 0.00772 GPa/K by GGA, suggesting the upper and lower limits of the phase boundary for α/β forsterite. At temperature of less than 1000 K, the calculated results agree reasonably with experimental ones. Thus, the present results indicate that combination of first-principles and quasi-harmonic Debye model is an efficient approach to simulate the behavior of minerals at high pressure and/or high temperature.
Year
DOI
Venue
2008
10.1016/j.cpc.2008.04.003
Computer Physics Communications
Keywords
Field
DocType
91.60.Gf,91.60.Fe,91.60.Hg,91.60.Ki
First principle,Thermodynamics,Forsterite,Phase boundary,Lattice (order),Phase transition,Local-density approximation,Crystal,Debye model,Mathematics,Condensed matter physics
Journal
Volume
Issue
ISSN
179
6
0010-4655
Citations 
PageRank 
References 
0
0.34
0
Authors
6
Name
Order
Citations
PageRank
Lei Liu1444.08
Jian Du2448.43
Jijun Zhao332.63
Hong Liu400.34
Di Wu500.34
Fuliang Zhao600.34