Structure and elasticity of MgO at high pressure

We used several pressure markers such as MgO NaCl YbD 2 to determine the pressure The pressure was calculated based on the equation of state (EOS) for each marker [] In the experiments a powder sample was loaded in a pair of TiZr encapsulating gaskets together with a pressure transmitting medium of 4:1 mixture of deuterated methanol and ethanol Both MgCO 3 and Mg(OH) 2 are converted to MgO by calcination The thermal treatment of the calcination process affects the surface area and pore size and hence the reactivity of magnesium oxide formed The source largely determines the level and nature of impurities present in the calcined material Caustic calcined magnesia is formed by calcining in the range 700 – 1000 o C By calcining in

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Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure The chemical symbol for Hydrogen is H With a standard atomic weight of circa 1 008 hydrogen is the lightest element on the periodic table Its monatomic form (H) is the most abundant chemical substance in the Universe constituting roughly 75% of all baryonic mass

The target was placed immediately beyond the gun barrel The targets were steel plates 300 mm in diameter and of nominal thicknesses of 1 2 and 3 mm Two tests were performed with 1 mm target plates the second test at a higher pressure The arrangement of the target structure is shown in Figure 2 Holding the target plate in place around

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Compared with the elastic constants of rhodochrosite and magnesite at high pressure and ambient temperature the three diagonal elastic constants C 11 C 33 C 44 of the former are all less than the latter [20 Yang J Mao Z Lin JF et al Single-crystal elasticity of the deep-mantle magnesite at high pressure and temperature Earth Planet Sci

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Elasticity of Single- Crystal Olivine at High Pressure and Temperatures Earth and Planetary Science Letters (2015) • Fan D W Mao Z Yang J Lin J-F Determination of the Full Elastic Moduli of Single- Crystals Using Shear Wave Velocities by Brillouin Spectroscopy American Mineralogist (2015)

This paper discusses the high pressure-dependent crystal structure phase transformation and elastic behavior of ZnSe x Te 1 − x (x = 0 0 0 2 0 55 0 81 0 93 and 1 0) by speculating effective interionic interaction potential (EIoIP) that contains long-range type Coulomb force short-range overlap repulsion of the Hafemeister and Flygare types and the van der Waals (vdW) interaction

The primary pressure scales developed by xref rid=TangeYNishiharaYEtal2009 xml:base=bibrTange et al (2009)/xref and xref rid=YokooMKawaiNEtal2009 xml:base=bibrYokoo et al (2009)/xref using only pressure-scale-free experimental data of MgO Au and Pt produce internal consistent pressure and agree with EOS of xref rid

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MgO was found to be highly anisotropic in its elastic properties with the magnitude of the anisotropy first decreasing between 0 and 15 GPa and then increasing from 15 to 150 GPa Longitudinal and shear-wave velocities were found to vary by 23 and 59% respectively with propagation direction at 150 GPa The character of the anisotropy changes qualitatively with pressure At zero pressure

A further alternative is provided by the use of a dedicated high-pressure cell as that employed by Guimond et al to create flat (001) Epitaxial rock salt structure MgO(100) NiO(100) CoO(100) or MnO(100) oriented thin films have been reported to grow on Ag(100) surfaces MgO(100) on Mo(001) and the formation of MgO(111) on Ag(111) NiO(111) on Au(111) wurtzite ZnO(0001) on Ag(111

A-2-5 soils are unsuitable embankment material under 703 l6 B because of its low weight high optimum moisture high LL low PI and its propensity to sloughing in service Subgroups A-2-6 and A-2-7 This material consists of materials similar to those described under Subgroups A‑2‑4 and A-2-5 except that the fine portion contains plastic clay having the characteristics of the A-6 or A-7 group

The variations of elastic constants and their combinations with pressure follow a systematic trend identical to that observed in other com- pounds of the NaCl-type structure family and the Born relative stability criteria are valid in yttrium pnictides Keywords: high pressure structural phase transition elastic properties 1 Introduction The pressure-induced structural phase transition in

Perple_X Solution Model Glossary

Model does not behave well at high pressure (P1GPa) see other warnings in solution model file For granitic compositions [27 49] MELTS(GS) melt Na-Mg-Al-Si-K-Ca-Fe hydrous silicate melt Model for P1GPa see warnings in solution model file For mafic-ultramafic compositions [23] MF magnesioferrite Mg x Fe 3–x O 4 Ideal Mica(CHA) white mica K y Ca x Na 1–x–y (Mg 1-v Fe v) z Mg

05 12 2000Experimental Measurements High-pressure elastic properties of single-crystal MgO were measured at 300 K with a Brillouin scattering system and a method similar to that described by Zha et al (26 30 31) Additional cylindrical lenses were used for the correction of astigmatism () Argon-ion laser radiation at 514 5 nm was used with a symmetric 90 scattering geometry ()

One is the temperature at which the major high-pressure minerals of the transition zone transform to the denser phase (Mg Fe)SiO 3-perovskite plus (Mg Fe)O-magnesiowstite at a pressure of about 240 kbar which corresponds to a depth of 660 km where a large jump in the seismic velocity is observed Seismically this transition is very sharp and is localized to within a few kilometers The

These polymorphs included three enstatite type structures together with the high-pressure polymorphs adopting the ilmenite and perovskite structure respectively The calculated volume-dependent electronic ground state energy for each of the polymorphs is presented in Figure 1 The pyroxene-structured polymorphs proto- ortho- and clinoenstatite show a second energetic minimum at higher

High blood pressure has long been suspected as a factor in atherosclerosis Fifty million Americans have systolic blood pressure averaging greater that 140 mm Hg and/or diastolic pressure of 90 mm Hg or greater While epidemiologic investigations fail to establish a causal link most researchers agree that hypertension plays a role in atherogenesis Considerable research has been performed

However as static compression techniques are typically limited to peak pressures of 200 GPa much less is known about its behavior under high-pressure and -temperature conditions In this study the structure of MgO upon shock compression over the 200-700 GPa pressure range was examined at the Omega-EP Laser facility at the Laboratory for Laser Energetics University of Rochester

Structure and elasticity of MgO at high pressure B B Karki L Stixrude S J Clark M C Warren G J Ackland and J Crain The structural and elastic properties of MgO periclase were studied up to 150 GPa with the first-principles pseudopotential method within the local density approximation The calculated lattice constant of the B1 phase over the pressure range studied is within 1%

High-pressure effect on elastic constants stacking fault energy and correlation with dislocation properties in MgO and CaO L Liu X Z Wu a R Wang H F Feng and S Wu College of Physics and Institute for Structure and Function Chongqing University Chongqing 400044 P R China a e-mail: xiaozhiwucqu edu cn Received: 11 January 2012 Received in final form: 5 April 2012 Published

We used several pressure markers such as MgO NaCl YbD 2 to determine the pressure The pressure was calculated based on the equation of state (EOS) for each marker [] In the experiments a powder sample was loaded in a pair of TiZr encapsulating gaskets together with a pressure transmitting medium of 4:1 mixture of deuterated methanol and ethanol

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