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  • 1
    Electronic Resource
    Electronic Resource
    Single-crystal x-ray diffraction of brucite to 14 GPa (1995)
    Springer
    Physics and chemistry of minerals 22 (1995), S. 277-281 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Single-crystal brucite, Mg(OH)2, was studied to 14 GPa in a quasi-hydrostatic pressure medium using a diamond anvil cell and energy-dispersive synchrotron x-ray diffraction. The parameters of a third-order Birch-Murnaghan equation of state fit to the data are: K OT=42(2) GPa, and (∂K OT/∂P)T= 5.7(5). The bulk modulus is significantly lower than that obtained in recent shock compression and powder x-ray diffraction experiments under non-hydrostatic conditions. No evidence was found for a transition involving the Mg -O sub-structure over the pressure range of these experiments. This implies that the structural change previously identified at high pressure by Raman spectroscopy probably involves rearrangement of hydrogen atoms, leaving the Mg — O substructure largely unaffected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202767
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  • 2
    Electronic Resource
    Electronic Resource
    Quasi-hydrostatic compression of ruby to 500 Kbar (1988)
    Springer
    Physics and chemistry of minerals 16 (1988), S. 207-211 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Measurements of the cell parameters of ruby to 500 Kbar under quasi-hydrostatic conditions in a diamond-anvil cell show a practically isotropic compression, the ratio c/a of the hexagonal cell parameters remaining constant. These results are consistent with previous single-crystal measurements below 100 Kbar as well as with ultrasonic elastic-constant measurements. There is no evidence for significant differences between the bulk moduli of ruby and corundum, and a review of compression and ultrasonic data yield Ko = 2.53±0.01 Mbar and K′o = 5.0 ± 0.4. Good agreement with the experimental values is found for compressions calculated from empirically or theoretically determined elastic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220687
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  • 3
    Electronic Resource
    Electronic Resource
    P-V-T equation of state of magnesiowüstite (Mg0.6Fe0.4)O (1992)
    Springer
    Physics and chemistry of minerals 18 (1992), S. 416-422 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The lattice parameter of magnesiowüstite (Mg0.6Fe0.4)O has been measured up to a pressure of 30 GPa and a temperature of 800 K, using an external heated diamond anvil cell and diffraction using X-rays from a synchrotron source. The experiments were conducted under quasi-hydrostatic condition, using neon as a pressure transmitting medium. The experimental P-V-T data were fitted to a thermal-pressure model with the isothermal bulk modulus at room temperature K T0 = 157 GPa, (∇K TO /∇P) T =4, (∇K T /∇T) P =-2.7(3) × 10-2 GPa/K, (∇K T /∇T) v =-0.2(2) × 10-2 GPa/K and the Anderson-Grüneisen parameter δ T =4.3(5) above the Debye temperature. The data were also fitted to the Mie-Grüneisen thermal equation of state. The least-squares fit yields the Debye temperature θ DO = 500(20) K, the Grüneisen parameter γ 0=1.50(5), and the volume dependence q=1.1(5). Both thermal-pressure models give consistent P-V-T relations for magnesiowüstite to 140 GPa and 4000 K. The P-V-T relations for magnesiowüstite were also calculate by using a modified high-temperature Birch-Murnaghan equation of state with a δ t of 4.3. The results are consistent with those calculated by using the thermal-pressure model and the Mie-Grüneisen relation to 140 GPa and 3000 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200964
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  • 4
    Electronic Resource
    Electronic Resource
    Solid carbon at high pressure: Electrical resistivity and phase transition (1994)
    Springer
    Physics and chemistry of minerals 21 (1994), S. 1-5 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The electrical resistivity of polycrystalline graphite and amorphous carbon are measured at high pressures and room temperature. The results show that the resistivity of these carbon phases decreases with increasing pressure below 19 GPa. The pressure dependence of the resistivity (dlnϱ/dP) is determined to be-0.037 GPa−1 for the polycrystalline graphite and-0.039 GPa−1 for the amorphous carbon. A phase transition, interpreted as the transformation to hexagonal diamond phase, is observed in the polycrystalline graphite at about 20 GPa but not in the amorphous carbon. The present experimental results support the assumption that this phase transition is martensitic in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00205208
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and crystal chemistry of perovskite-type MgSiO3 (1978)
    Springer
    Physics and chemistry of minerals 3 (1978), S. 97-110 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Synthetic clinoenstatite (MgSiO3) has been converted to a single phase with the perovskite structure in complete reactions at approx. 300 kbar in experiments that utilize the laser-heated diamond-anvil pressure apparatus. The structure of this phase after quenching was determined by powder X-ray diffraction intensity measurement to be similar to that of the distorted rare-earth, orthoferrite-type, orthorhombic perovskites, but it is suggested that such distortion from ideal cubic perovskite would diminish at high pressure. The unit cell dimensions and density of perovskite-type MgSiO3 at ambient conditions (1 bar, 25°C) are a=4.780(1) Å, b=4.933(1) Å, c=6.902(1) Å, V=162.75 Å3, and ρ=4.098(1) g/cm3. This phase is 3.1% denser than the isochemical oxide mixture [periclase (MgO)+stishovite (SiO2)]. The small crystal-field stabilization energy of the cation site in the perovskite structure may play an important role in limiting the high-pressure stability field of perovskites that contain transition metal cations. Approximate calculations of the crystal-field effects indicate that perovskite of pure FeSiO3 composition may become stable at 400–600 kbar; pressures greater than 800 kbar would be required to stabilize CoSiO3 or NiSiO3 perovskite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308114
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopic Studies of p-H2 to Above 200 GPa (1998)
    Springer
    Journal of low temperature physics 110 (1998), S. 75-88 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Raman and infrared vibrational spectra of H 2 have been measured to pressures in excess of 200 GPa and at liquid helium temperatures using new high sensitivity techniques. Detailed study of the pressure dependence of o-p conversion rate reveals an initial increase followed by a decrease above 1 GPa. The conversion rate then increases dramatically with pressure, and this continues to above 50 GPa. New sets of vibron, phonon, roton, and libron excitations in converted para samples are documented as a function of pressure through phases I, II, and III. The results provide important information on the crystal structures, molecular orientational state, and vibrational dynamics of the high-pressure phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022562717211
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  • 7
    Electronic Resource
    Electronic Resource
    Raman scattering of vibrational overtones in deuterium at high pressures (1992)
    Springer
    Journal of low temperature physics 89 (1992), S. 707-710 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report observations of the Raman-active vibrational overtone in normal deuterium at 77K and pressures up to 36.4 GPa (1 GPa = 104 bar). We observed a sharp Q2(J) line corresponding to the v=2←0, ΔJ=0, k=0, Δk=0 transition and a broad Q1(J)+Q'1(J) band corresponding to v,v'=1←0, ΔJ=0, k≈-k' transitions. The selection rules for the Q1(J)+Q'1(J) manifold allowed us to measure the joint density of states of the manifold which we compared to a theoretical density of states for the v=1 vibrational band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694122
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  • 8
    Electronic Resource
    Electronic Resource
    Electronic and magnetic studies of materials to megabar pressures (2000)
    Springer
    Hyperfine interactions 128 (2000), S. 323-343 
    Details
    ISSN: 1572-9540
    Keywords: high pressure ; superconductivity ; ferromagnetism ; conductivity ; X-ray emission ; inelastic nuclear resonant scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Numerous recent developments in diamond-cell techniques are making possible a growing range of studies of the electronic and magnetic properties of materials to megabar pressures. We review recent advances in this area, including magnetic susceptibility, electrical conductivity, and synchrotron-based spectroscopic techniques. Highly sensitive magnetic susceptibility techniques have allowed the first observations of superconductivity at megabar pressures, including the observation of a Tc of 17 K in sulfur at 160 GPa, and a nearly pressure-independent Tc to above 230 GPa. The technique has recently been extended to allow measurements of the magnetic properties of ferromagnetic substances. Advances in the direct measurement of electrical conductivity using miniaturized leads have permitted measurements on H2O and Xe to above 100 GPa. Pressure-induced high-spin to low-spin transitions have been examined in FeS and FeO using new high-resolution X-ray emission techniques. New high-pressure inelastic scattering methods, including nuclear inelastic scattering techniques, have been used to determine the phonon density of states of Fe to above 150 GPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012600103087
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  • 9
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    Superconductivity in Hydrogen-rich Material: GeH4 (2010)
    Springer
    Details
    Publication Date: 2010-01-21
    Print ISSN: 1557-1939
    Electronic ISSN: 1557-1947
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Springer
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  • 10
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    Unit cell determination of coexisting post-perovskite and H-phase in (Mg,Fe)SiO3 using multigrain XRD: compositional variation across a laser heating spot at 119 GPa (2016)
    Springer
    Details
    Publication Date: 2016-05-12
    Electronic ISSN: 2197-4284
    Topics: Geosciences , Physics
    Published by Springer
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