Journal ArticleDOI
Variations in thermal properties of diamond under isothermal compression
TLDR
In this paper, the state equation P(V/V 0, T) and baric dependences of thermal properties of diamond have been obtained without any fitting parameters from the interatomic pair Mie-Lennard Jones potential and the Einstein model of a crystal.Abstract:
State equation P(V/V
0, T) and baric dependences of thermal properties of diamond have been obtained without any fitting parameters from the interatomic pair Mie–Lennard-Jones potential and the Einstein model of a crystal Calculations have been performed along two isotherms (at T = 300 and 3000 K) up to P = 10000 kbar = 1000 GPa, ie, to a relative volume of V/V
0 = 05 The baric dependences have been obtained for the following characteristics: isothermal elastic modulus B
T
and B'(P), isochoric heat capacity C
v
and C
v
' (P), isobaric heat capacity C
p
; thermal expansion coefficient α
p
and α
p
' (P); and specific surface energy σ, as well as its derivatives σ'(P) and σ'(T) It is shown that for P → ∞, functions B
T
(P) and σ(P) vary linearly, functions B'(P), α
p
(P), C
v
(P), C
p
(P) and σ'(P) tend to constants, while functions α
p
'(P), C
v
'(P), and difference C
p
(P)–C
v
(P) tend to zero Good agreement with experimental data has been demonstratedread more
Citations
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Journal ArticleDOI
Molybdenum lattice properties at high pressure
TL;DR: In this paper, the parameters of the pair potential were determined by self-consistent fitting to the values of the coefficient of thermal expansion and the bulk modulus under normal conditions.
Journal ArticleDOI
Equation of state and properties of Nb at high temperature and pressure
S.P. Kramynin,E.N. Akhmedov +1 more
TL;DR: Baric dependencies of the thermalphysic properties and melting temperature, as well as the thermal equation of state for niobium were obtained based on the pair interatomic Mie-Lenard-Jones potential and the crystal Einstein model.
Journal ArticleDOI
Numerical Simulation of Thermodynamic Parameters of High-Porosity Copper
K. K. Maevskii,S. A. Kinelovskii +1 more
TL;DR: In this paper, a modified equation of state was used for calculating the thermodynamically equilibrium TEC2 model for improving the reliability of description of thermodynamic parameters of shock loading of pure materials and heterogeneous mixtures of various porosities.
Journal ArticleDOI
Equations of State of Ca-Silicates and Phase Diagram of the CaSiO3 System under Upper Mantle Conditions
TL;DR: The phase diagram of the CaSiO3 system is constructed at pressures up to 20 GPa and temperatures up to 2000 K and clarifies the phase boundaries of Ca-silicates under upper mantle conditions as discussed by the authors.
Journal ArticleDOI
The baric properties of isotope-pure diamonds from 12C and 13C
TL;DR: In this paper, the parameters of the pair potential of interatomic interaction for diamond from 12C and from 13C were determined based on the experimental data on the ratio of Raman frequencies in isotope-pure diamonds.
References
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Journal ArticleDOI
Thermal expansion of some diamondlike crystals
Glen A. Slack,S. F. Bartram +1 more
TL;DR: The thermal expansion of AlN, cubic BN, and BP has been measured from 77 to 1300 K by x−ray techniques as mentioned in this paper, and the derived thermal expansion coefficients are compared with those of diamond, Si, Ge, SiC, GaP, and BeO using the Debye temperature as a scaling parameter.
Journal ArticleDOI
Compressibility of solids
TL;DR: In this article, a universal form for the equation of state (EOS) of solids is proposed and good agreement is found for a variety of test data for materials of geophysical interest.
Journal ArticleDOI
Properties of diamond under hydrostatic pressures up to 140 GPa.
TL;DR: By combining the volume and the frequency pressure shifts, it is deduced that diamond remains very stable under pressure: it is a Gruneisen solid up to at least 140 GPa, and the covalent bond is even slightly strengthened under pressure.