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  • 1
    Electronic Resource
    Electronic Resource
    Partitioning of nickel and cobalt between silicate perovskite and metal at pressures up to 80 GPa (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 604-607 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The high abundance of both nickel and cobalt and the chondritic Ni/Co ratio found in samples derived from the Earth's mantle are at odds with results from laboratory-based partitioning experiments conducted at pressures up to 27 GPa (refs 1,2). The laboratory results ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/19287
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  • 2
    Electronic Resource
    Electronic Resource
    Constraints on the melting temperature of the lower mantle from high-pressure experiments on MgO and magnesioüstite (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 506-508 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The melting temperature of the lower mantle is assumed to be near the eutectic in the phase diagram MgO-FeO-SiO2, representing most likely 90% of the lower-mantle chemistry. It has been suggested previously that (Mg, Fe)SiO3-perovskite lies FIG. 1 Sample of single crystal of MgO in an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/371506a0
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrostatic compression of γ-(Mg0.6, Fe0.4)2SiO4 to 50.0 GPa (1993)
    Springer
    Physics and chemistry of minerals 19 (1993), S. 507-509 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The bulk modulus, K 0, and its pressure derivative K′0, of γ-(Mg0.6, Fe0.4)2SiO4 have been accurately determined to 50.0 GPa under hydrostatic conditions at room temperature in a diamond cell using synchrotron radiation. Our results agree with Brillouin and ultrasonic measurements on γ-Mg2SiO4 at low pressure, indicating normal elastic behaviour in the metastable pressure range of this high pressure mineral. Our values of K 0 and k′0 are 183.0 GPa and 5.4, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00203192
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  • 4
    Electronic Resource
    Electronic Resource
    The transition of pyrope to perovskite (1998)
    Springer
    Physics and chemistry of minerals 25 (1998), S. 193-196 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract  The stability field of Mg3Al2Si3O12-pyrope was examined for the first time under hydrostatic pressure conditions in a CO2-laser heated diamond cell in the pressure range 21–30 GPa between 2300 and 3200 K. The phases were characterized using Raman and fluorescence spectroscopy. With increasing pressure pyrope transforms to an ilmenite phase above ∼21.5 GPa, to perovskite plus ilmenite above ∼24 GPa, and to perovskite above 29 GPa. The pressures of the first occurrence of perovskite in this study are about 2 GPa above the corresponding phase boundary between end-member MgSiO3-ilmenite and perovskite. A small amount of Al2O3 coexists with perovskite up to 43 GPa, as evident from fluorescence spectra resembling those of ruby, but above 43 GPa the entire Al2O3 content of the pyrope starting material is accommodated in the perovskite structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002690050102
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  • 5
    Electronic Resource
    Electronic Resource
    Relative stability of red and black phosphorus at P〈1 GPa (1992)
    Springer
    Journal of materials science 27 (1992), S. 2677-2681 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Relative stability of red and black phosphorus at P 〈 1 GPa was investigated by rapid and slow cooling from the melt under high pressure and by baro-thermal analysis. The red form was produced from the melt of the black phosphorus. The density of the produced samples of red phosphorus was ρ = 2.33 g cm−3. The existence of a region of stability on the P-T plane for red phosphorus was established. A qualitative phase diagram for phosphorus is presented; the red form is most stable at high temperatures and relatively low pressures. It is necessary to undertake careful investigations at pressures P〈 0.3 GPa under pure hydrostatic conditions to make quantitative measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540689
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