Thermal expansion of MgSiO<sub>3</sub> perovskite at 20.5 GPa

Morishima, H.; Ohtani, Eiji; Kato, T.; Shimomura, Osamu; Kikegawa, Takumi

doi:10.1029/94gl00844

Cited by 25 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results are consistent with the experimental data within the existing large uncertainties. 21,22,[24][25][26][27][28][29] The thermal Grüneisen parameter is defined as ␥ ϭ␣VK T /C V , where C V is the heat capacity at constant volume. The predicted value of ␥ is 1.61 at ambient condition, compared to the relatively wide variation of 1.3-1.96 reported previously.…”

Section: B Thermodynamical Propertiesmentioning

confidence: 99%

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

et al. 2000

View full text Add to dashboard Cite

Phonon dispersions of MgSiO 3 perovskite are calculated as a function of pressure up to 150 GPa using density-functional perturbation theory. Predicted zone-center frequencies and their pressure shifts are in close correspondence with existing Raman and infrared data, even though identification of the measured modes may be ambiguous. It is shown that the frequencies increase monotonically with pressure and no soft modes exist over the pressure regime studied. Low-frequency modes appear to be primarily associated with the SiO 6 octahedral libration and large Mg displacement whereas high-frequency modes are dominated by octahedral deformation. The calculated frequencies are then used to determine the thermal contribution to the Helmholtz free energy within the quasiharmonic approximation and derive the equation of state, heat capacity, and entropy.

show abstract

Section: B Thermodynamical Propertiesmentioning

confidence: 99%

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

et al. 2000

View full text Add to dashboard Cite

show abstract

“…Although there are some agreements among the studies, inconsistencies still remain particularly at the higher temperatures [e.g., Jeanloz and Hemley, 1994] The first measurement under simultaneous high-pressure and high-temperature conditions was made by Mao et al [1991 ]. Recent development of multi-anvil technique combined with synchrotron radiation has made it possible to carry out similar experiments with relatively large volume samples [Wang et a/.,1991[Wang et a/., ,1994Morishima et al, 1994]. Recent development of multi-anvil technique combined with synchrotron radiation has made it possible to carry out similar experiments with relatively large volume samples [Wang et a/.,1991[Wang et a/., ,1994Morishima et al, 1994].…”

Section: Introductionmentioning

confidence: 99%

Thermal expansivity of MgSiO₃ perovskite under high pressures up to 20 GPa

Utsumi¹,

Funamori²,

Yagi³

et al. 1995

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Volume measurement of MgSiO3 perovskite was made in the temperature range from 25 to 500°C as a function of pressure up to 20 GPa by in situ x‐ray diffraction, using a DIA apparatus combined with synchrotron radiation. The measured thermal expansivity ranges from 1.8 to 2.5*10−5 /K and decreases only slightly with pressure. Our present results are in good agreement with the previous lower pressure (up to 11 GPa) data of Wang et al. [1994] and the higher pressure (36 GPa) data of Funamori and Yagi [1993], but contrast with the results using diamond anvil cell by Mao et al. [1991], particularly in a low pressure range.

show abstract

“…In Figure c, symbols show experimental data by Fiquet et al () (triangles), Andrault et al () (circles), Li and Zhang () (hexagons), and Chantel et al () (diamonds). In Figure d, symbols show experimental measurements between 19 GPa and 21 GPa by Morishima et al () (triangles), Utsumi et al () (diamonds), and Katsura et al () (circles).…”

Section: Basic Phase Equilibria and Property Parametersmentioning

confidence: 94%

MMA‐EoS: A Computational Framework for Mineralogical Thermodynamics

et al. 2017

View full text Add to dashboard Cite

We present a newly developed software framework, MMA‐EoS, that evaluates phase equilibria and thermodynamic properties of multicomponent systems by Gibbs energy minimization, with application to mantle petrology. The code is versatile in terms of the equation‐of‐state and mixing properties and allows for the computation of properties of single phases, solution phases, and multiphase aggregates. Currently, the open program distribution contains equation‐of‐state formulations widely used, that is, Caloric‐Murnaghan, Caloric–Modified‐Tait, and Birch‐Murnaghan–Mie‐Grüneisen‐Debye models, with published databases included. Through its modular design and easily scripted database, MMA‐EoS can readily be extended with new formulations of equations‐of‐state and changes or extensions to thermodynamic data sets. We demonstrate the application of the program by reproducing and comparing physical properties of mantle phases and assemblages with previously published work and experimental data, successively increasing complexity, up to computing phase equilibria of six‐component compositions. Chemically complex systems allow us to trace the budget of minor chemical components in order to explore whether they lead to the formation of new phases or extend stability fields of existing ones. Self‐consistently computed thermophysical properties for a homogeneous mantle and a mechanical mixture of slab lithologies show no discernible differences that require a heterogeneous mantle structure as has been suggested previously. Such examples illustrate how thermodynamics of mantle mineralogy can advance the study of Earth's interior.

show abstract

Thermal expansion of MgSiO₃ perovskite at 20.5 GPa

Cited by 25 publications

References 16 publications

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

Thermal expansivity of MgSiO₃ perovskite under high pressures up to 20 GPa

MMA‐EoS: A Computational Framework for Mineralogical Thermodynamics

Contact Info

Product

Resources

About

Thermal expansion of MgSiO3 perovskite at 20.5 GPa

Cited by 25 publications

References 16 publications

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

Ab initiolattice dynamics ofMgSiO3perovskite at high pressure

Thermal expansivity of MgSiO3 perovskite under high pressures up to 20 GPa

MMA‐EoS: A Computational Framework for Mineralogical Thermodynamics

Contact Info

Product

Resources

About

Thermal expansion of MgSiO₃ perovskite at 20.5 GPa

Thermal expansivity of MgSiO₃ perovskite under high pressures up to 20 GPa