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- Article name
- On the use of power-law potentials to constructing the equations of state for crystalline components of composite materials
- Authors
- OSTRIK A. V., , ostrik@ficp.ac.ru, Institute for Problems of Chemical Physics RAS, Chernogolovka, Russia
NIKOLAEV D. N., , nik@ficp.ac.ru, Institute for Problems of Chemical Physics RAS, Chernogolovka, Moscow region, Russia
AKHMETOVA M. A., , ostrikma@ficp.ac.ru, Federal research center of problems of chemical physics and medical RAS; Leonov Technological University, Chernogolovka, Moscow region, Russia; Korolev, Moscow Region, Russia
- Keywords
- polycrystalline components of high-modulus composite materials / silicon dioxide / high pressures / polymorphism / melting / low-parametric equations of state / shock-wave experiments
- Year
- 2025 Issue 3 Pages 38 - 44
- Code EDN
- VNJNXE
- Code DOI
- 10.52190/2073-2562_2025_3_38
- Abstract
- Within the power-law potentials, two approaches to the construction of state equations for polycrystalline materials are considered. These approaches are realized by example of polymorphic forms and melt of silica. As a result, low-parameter polymorphic equations of state for silica were constructed. The adequacy of the constructed equations of state is justified by comparing the calculated data with the results of experiments on the phase diagram and shock adiabate of silicon dioxide, taking into account polymorphic transitions and melting. It has been found that the Murnaghan equation approach is more preferable for constructing phase diagrams in the region of moderate pressures. However, in the field of high pressures, the approach to constructing equations of state in the form of Mi-Gruneisen makes it possible to obtain a good correspondence between the calculated and experimental data on the shock adiabate.
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