Modelling of polymorphic phase transitions under shock wave loading

Maevskii, K. K.

doi:10.1063/1.5099873

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…Учет равенства температур компонентов смеси позволяет рассчитывать ударные адиабаты смесей в пределах точности экспериментов [25,26]. В области фазового перехода образец рассматривается как смесь фазы низкого и фазы высокого давления, что дает возможность достоверно описывать область полиморфного фазового перехода исследуемых веществ [27]. Появляется возможность описывать термодинамические параметры смесей содержащих в своем составе компоненты, испытывающие фазовый переход при ударно волновом воздействии.…”

Section: постановка задачиunclassified

Численное моделирование поведения энстатита до 1.4 TPa

Маевский¹

2023

Физика Твердого Тела

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An accurate description of the effect of extreme pressure and temperature on the physical properties of materials is required to understand the structure and composition of the mantle of the Earth and similar planets. One of such materials is enstatite MgSiO3, which causes increased interest in the investigating of its behavior under intense dynamic loads. It is proposed to consider the shock-wave loading of enstatite as a mixture of quartz oxides SiO2 and MgO periclase in an equal stoichiometric ratio based on experimental data in which decomposition of magnesium silicates was observed. Calculations are performed using a thermodynamically equilibrium model that takes into account the phase transitions of the components. Phase transitions of SiO2 and MgO are taken into account when modeling high-energy effects on enstatite. The results are compared with the data obtained on the basis of shock-wave loading experiments, as well as with calculations based on the PREM model performed based on the results of seismic exploration.

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Section: постановка задачиunclassified

Численное моделирование поведения энстатита до 1.4 TPa

Маевский¹

2023

Физика Твердого Тела

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“…The model under study makes it possible to reliably describe the results of shock-wave experiments in the pressure range of 1 GPa to 10 TPa for both solid and porous samples of pure materials, including SiO 2 and MgO. Complementing the system of equations of dynamic compatibility with the condition of equality of temperatures of the mixture components, dependences are written that can be interpreted as shock adiabats of heterogeneous sample [22][23][24]. At the same time, considering the material under study in the phase transition region as a mixture of low pressure and high pressure phases, it is possible to reliably describe the region of polymorphic phase transition for various substances, including oxides [25,26].…”

Section: Problem Formulationmentioning

confidence: 99%

“…Thermodynamic parameters of heterogeneous materials (values of pressure, density, temperature) are calculated in the region of polymorphic phase transition, based on the assumption that the material under study is a mixture of the low pressure phase and the high pressure phase [24][25][26]. When simulating in the phase transition region, it is assumed that the volume fraction of the low-pressure α-phase passed into the high-pressure phase.…”

Section: Calculation Proceduresmentioning

confidence: 99%

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Modeling of shock-wave loading of magnesium silicates on the example of forsterite

Maevskii

2022

Technical Physics

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The results of modeling the shock-wave loading of Mg2SiO4 forsterite, which in this case is considered as a mixture of SiO2 quartz and MgO periclase, are presented. The model is based on the assumption that the components of the mixture under shock-wave loading are in thermodynamic equilibrium. The model allows us to reliably describe the phase transition region. The components of the investigated material are considered as a mixture of low and high pressure phases. Polymorphic phase transitions of quartz and periclase are taken into account in the calculation of forsterite in pressure range from 1 to 1000 GPa. The results are verified by experimental data obtained in dynamic experiments. Keywords: Equation of state, shock adiabat, thermodynamic equality, magnesium silicates, forsterite. DOI: 10.21883/0000000000

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