EXTREME COMPRESSION BEHAVIOUR OF SOLIDS BASED ON THE ROY-ROY INVERTED EQUATION OF STATE

2008 ◽  
Vol 22 (07) ◽  
pp. 909-915
Author(s):  
R. S. CHAUHAN ◽  
K. LAL
Keyword(s):  
Equation Of State ◽  
Bulk Modulus ◽  
Organic Solids ◽  
Inorganic Solids ◽  
The Core ◽  
The Earth ◽  
Compression Behaviour ◽  
Seismological Data ◽  
Murnaghan Equation ◽  
Data Modifications

An analysis has been presented using the Roy-Roy equation of state (EOS), which represents an extended and modified version of the Murnaghan EOS. It is found that the value of [Formula: see text] for various types of solids remain between 5/3 and 2. The Roy-Roy EOS has been found to become applicable for the core of the Earth, predicting the values of the pressure and bulk modulus in the range of seismological data. Modifications suggested recently to remove the shortcomings of the Murnaghan equation have been discussed. The maximum values of [Formula: see text] obtained from the Roy-Roy EOS for different inorganic solids and organic solids are also discussed.

Improving data, metadata and service quality within Résif-SI

2021 ◽  
Author(s):  
Jonathan Schaeffer ◽  
Fabien Engels ◽  
Marc Grunberg ◽  
Christophe Maron ◽  
Constanza Pardo ◽  
...  
Keyword(s):  
Seismic Data ◽  
Geodetic Network ◽  
Service Availability ◽  
End User ◽  
The Core ◽  
Data Centre ◽  
The Earth ◽  
Seismological Data ◽  
Data Portal ◽  
Geophysical Observation

<p>Résif, the French seismological and geodetic network, was launched in 2009 in an effort to develop, modernize, and centralize geophysical observation of the Earth’s interior. This French research infrastructure uses both permanent and mobile instrument networks for continuous seismological, geodetic and gravimetric measurements.</p><p>Résif-SI is the Information System that manages, validates and distributes seismological data from Résif.</p><p>The construction of Résif-SI has lead to a federated organisation gathering several data and metadata producers (Nodes) and a national Seismological Data Centre.</p><p>The Résif Seismological Data Centre is one of 19 global centres distributing data and metadata in formats and using protocols which comply with International Federation of Digital Seismograph Networks (FDSN) standards. It is also one of the eleven nodes in EIDA, the European virtual data centre and seismic data portal in the European Plate Observing System (EPOS) framework.</p><p>Inside Résif-SI, each Node has it's specificities and dedicated procedures in order to manage and validate the data and metadata workflow from the station instruments to the Résif Seismological Data Centre.</p><p>To meet the expectations and needs of the end user in terms of data quality, metadata consistency and service availability, Résif-SI operates a complex set of quality enhancement operations.</p><p>This contribution will present the quality expectations that are in the core of Résif-SI, and show the methods and tools that help us meeting the expectations, and that could be of interest for the rest of the community.</p><p>We will then list some of our quality improvement projets and the expected results.</p>

scholarly journals An Equation of State for the Core of the Earth

1960 ◽  
Vol 3 (1) ◽  
pp. 68-77 ◽  
Author(s):  
Leon Knopoff ◽  
Gordon J. F. MacDonald
Keyword(s):  
Equation Of State ◽  
The Core ◽  
The Earth

Elastic Constants, Equation of State and Mechanical Relaxations of some Metallic Glasses at High Pressure

2012 ◽  
Vol 706-709 ◽  
pp. 1305-1310
Author(s):  
Masaru Aniya
Keyword(s):  
Equation Of State ◽  
Bulk Modulus ◽  
Elastic Constants ◽  
Metallic Glasses ◽  
High Pressures ◽  
Present Report ◽  
Bulk Metallic Glasses ◽  
Pressure Derivative ◽  
Simple Method ◽  
Murnaghan Equation

One of the fundamental physical quantities necessary to describe the mechanical properties of the materials is the bulk modulus. In the present report, a simple method to estimate the values of the bulk modulus and its pressure derivative of metallic glasses is presented. The method which is based on a jellium model of metals provides a good agreement with measured data. The estimated values of the elastic constants have been used to determine the equation of state of bulk metallic glasses. It is found that the usual Murnaghan equation of state deviates considerably from the experimental results at high pressures. The deviation has been interpreted to arise from the structural relaxations. The effect of pressure on the fragility of bulk metallic glasses is discussed briefly.

The thermal equation of state of (Fe0.86Mg0.07Mn0.07)3Al2Si3O12 almandine

2009 ◽  
Vol 73 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Dawei W. Fan ◽  
Wenge G. Zhou ◽  
Congqiang Q. Liu ◽  
Yonggang G. Liu ◽  
Fang Wan ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Synchrotron Radiation ◽  
Equation Of State ◽  
Bulk Modulus ◽  
Temperature Derivative ◽  
Thermal Equation ◽  
Diamond Anvil ◽  
Murnaghan Equation ◽  
First Time

In situ X-raydiffraction measurements on almandine, (Fe0.86Mg0.07Mn0.07)3Al2Si3O12, were performed using a heating diamond-anvil cell instrument with synchrotron radiation at Beijing Synchrotron Radiation Facilityup to 27.7 GPa and 533 K. The pressure-volume-temperature data were fitted to a third-order Birch-Murnaghan equation of state. The isothermal bulk modulus of K0 = 177±2 GPa, a temperature derivative of the bulk modulus of (∂K/∂T)P= –0.032±0.016 GPaK–1 and a thermal expansion coefficient (α0) of (3.1±0.7)×10–5 K–1 were obtained. This is the first time that the temperature derivative of the bulk modulus of almandine has been determined at high pressure and high temperature. Combining these results with previous results, the compositional dependence of the bulk modulus, thermal expansion, and temperature derivative of the bulk modulus are discussed.

Thermoelastic properties of the earth lower mantle

2017 ◽  
Vol 31 (14) ◽  
pp. 1750108 ◽  
Author(s):  
K. Sunil ◽  
B. S. Sharma
Keyword(s):  
Bulk Modulus ◽  
Lower Mantle ◽  
Thermal Expansivity ◽  
Adiabatic Condition ◽  
Thermoelastic Properties ◽  
Pressure Derivative ◽  
The Earth ◽  
Seismological Data ◽  
The Relationship ◽  
Derivatives Of

For investigating the pressure dependence of thermal expansivity of materials, we have developed a formulation using the Stacey relationship between the reciprocal of pressure derivative of bulk modulus and the ratio of pressure and bulk modulus. The formulation presented here satisfies the boundary conditions both at zero pressure and also in the limit of infinite pressure at extreme compression. A physically acceptable relationship has been obtained between the volume derivative of thermal expansivity and the pressure derivatives of bulk modulus under adiabatic condition. The seismological data for the Earth lower mantle have been used to demonstrate the validity of the relationship between thermoelastic properties derived in the present study.

Ups and Downs

2018 ◽  
Author(s):  
Roy Livermore
Keyword(s):  
Mantle Convection ◽  
Laboratory Experiments ◽  
Inner Core ◽  
Computer Modelling ◽  
Great Depth ◽  
New Horizons ◽  
The Core ◽  
The Earth ◽  
The World ◽  
The 1960S

Despite the dumbing-down of education in recent years, it would be unusual to find a ten-year-old who could not name the major continents on a map of the world. Yet how many adults have the faintest idea of the structures that exist within the Earth? Understandably, knowledge is limited by the fact that the Earth’s interior is less accessible than the surface of Pluto, mapped in 2016 by the NASA New Horizons spacecraft. Indeed, Pluto, 7.5 billion kilometres from Earth, was discovered six years earlier than the similar-sized inner core of our planet. Fortunately, modern seismic techniques enable us to image the mantle right down to the core, while laboratory experiments simulating the pressures and temperatures at great depth, combined with computer modelling of mantle convection, help identify its mineral and chemical composition. The results are providing the most rapid advances in our understanding of how this planet works since the great revolution of the 1960s.

scholarly journals Synthesis and Compressibility of Novel Nickel Carbide at Pressures of Earth’s Outer Core

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 516
Author(s):  
Timofey Fedotenko ◽  
Saiana Khandarkhaeva ◽  
Leonid Dubrovinsky ◽  
Konstantin Glazyrin ◽  
Pavel Sedmak ◽  
...  
Keyword(s):  
Equation Of State ◽  
Outer Core ◽  
Direct Reaction ◽  
Volume Data ◽  
X Ray Diffraction ◽  
Nickel Carbide ◽  
Diamond Anvils ◽  
Group A ◽  
Diamond Anvil ◽  
Murnaghan Equation

We report the high-pressure synthesis and the equation of state (EOS) of a novel nickel carbide (Ni3C). It was synthesized in a diamond anvil cell at 184(5) GPa through a direct reaction of a nickel powder with carbon from the diamond anvils upon heating at 3500 (200) K. Ni3C has the cementite-type structure (Pnma space group, a = 4.519(2) Å, b = 5.801(2) Å, c = 4.009(3) Å), which was solved and refined based on in-situ synchrotron single-crystal X-ray diffraction. The pressure-volume data of Ni3C was obtained on decompression at room temperature and fitted to the 3rd order Burch-Murnaghan equation of state with the following parameters: V0 = 147.7(8) Å3, K0 = 157(10) GPa, and K0' = 7.8(6). Our results contribute to the understanding of the phase composition and properties of Earth’s outer core.

scholarly journals Neutron star properties and the equation of state for the core

2017 ◽  
Vol 599 ◽  
pp. A119 ◽  
Author(s):  
J. L. Zdunik ◽  
M. Fortin ◽  
P. Haensel
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
The Core

scholarly journals Nuclear equation of state and neutron star cooling

2017 ◽  
Vol 26 (04) ◽  
pp. 1750015 ◽  
Author(s):  
Yeunhwan Lim ◽  
Chang Ho Hyun ◽  
Chang-Hwan Lee
Keyword(s):  
Neutron Star ◽  
Equation Of State ◽  
Neutron Stars ◽  
Nuclear Matter ◽  
Thermal Evolution ◽  
Observation Data ◽  
Nuclear Equation Of State ◽  
The Core ◽  
Dense Nuclear Matter ◽  
Nuclear Models

In this paper, we investigate the cooling of neutron stars with relativistic and nonrelativistic models of dense nuclear matter. We focus on the effects of uncertainties originated from the nuclear models, the composition of elements in the envelope region, and the formation of superfluidity in the core and the crust of neutron stars. Discovery of [Formula: see text] neutron stars PSR J1614−2230 and PSR J0343[Formula: see text]0432 has triggered the revival of stiff nuclear equation of state at high densities. In the meantime, observation of a neutron star in Cassiopeia A for more than 10 years has provided us with very accurate data for the thermal evolution of neutron stars. Both mass and temperature of neutron stars depend critically on the equation of state of nuclear matter, so we first search for nuclear models that satisfy the constraints from mass and temperature simultaneously within a reasonable range. With selected models, we explore the effects of element composition in the envelope region, and the existence of superfluidity in the core and the crust of neutron stars. Due to uncertainty in the composition of particles in the envelope region, we obtain a range of cooling curves that can cover substantial region of observation data.

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