메뉴 건너뛰기




Volumn 280, Issue 5372, 1998, Pages 2093-2095

(Mg,Fe)SiO3-perovskite stability under lower mantle conditions

Author keywords

[No Author keywords available]

Indexed keywords

MAGNESIUM DERIVATIVE; MAGNESIUM SILICATE; SILICATE; SILICON DERIVATIVE;

EID: 0032569056     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.280.5372.2093     Document Type: Review
Times cited : (83)

References (27)
  • 4
    • 0029659563 scopus 로고    scopus 로고
    • S. K. Saxena et al., ibid. 274, 1357 (1996).
    • (1996) Science , vol.274 , pp. 1357
    • Saxena, S.K.1
  • 5
    • 0007038967 scopus 로고
    • We laser-heated samples in a large variety of pressure media and found that the laser power required in a NaCl pressure medium is markedly higher than that for CsCl or KBr media. This result is consistent with a comparative study of several alkali halides, where the thermal conductivity of NaCl in the B2 structure was estimated to be at least three times that of CsCl [G. A. Slack and R. G. Ross, J. Phys. C 18, 3957 (1985)).
    • (1985) J. Phys. C , vol.18 , pp. 3957
    • Slack, G.A.1    Ross, R.G.2
  • 6
    • 3543031272 scopus 로고    scopus 로고
    • note
    • 2 laser techniques of order 1000 K.
  • 7
    • 0000653342 scopus 로고
    • YAG laser heating without thermally insulating media causes temperature gradients in silicates ranging from 100° to 1000° per micrometer depending on the peak temperature [D. L. Heinz and R. Jeanloz, J. Geophys. Res. 92, 11437 (1987)].
    • (1987) J. Geophys. Res. , vol.92 , pp. 11437
    • Heinz, D.L.1    Jeanloz, R.2
  • 14
    • 3543024156 scopus 로고    scopus 로고
    • note
    • The emitted light from the sample was measured from areas of 2 to 3 μm in diameter in the center of the hot spot with a charge-coupled device (CCD) detector in the wavelength range of 500 to 815 nm. Emissivity was taken to be independent of the wavelength.
  • 15
    • 3543037240 scopus 로고    scopus 로고
    • note
    • 0.15O was provided by S. Kesson (Australian National University). Powder mixtures with 1-to 2-μm grain size were compressed at about 5 GPa with a DAC to form pellets with about 10-μm thickness.
  • 16
    • 3542991729 scopus 로고    scopus 로고
    • note
    • The orthoenstatite sample was from the Smithsonian Institute (#137311).
  • 17
    • 3543011630 scopus 로고    scopus 로고
    • note
    • 2 laser and rapid quenching between two platinum-plated copper blocks.
  • 20
    • 3543048245 scopus 로고    scopus 로고
    • note
    • -1 lower. Upon pressure release, the position of the Raman modes matches those measured previously.
  • 21
    • 3542994103 scopus 로고    scopus 로고
    • note
    • -1 in the spectrum taken at 15 GPa (Fig. 3B).
  • 23
    • 0006620376 scopus 로고    scopus 로고
    • M. D. Dyar, C. McCammon, M. W. Schaefer, Eds. Special Publication 5, Geochemical Society, Columbus, OH
    • A. Chopelas, in Mineral Spectroscopy: A Tribute to Roger Burns, M. D. Dyar, C. McCammon, M. W. Schaefer, Eds. (Special Publication 5, Geochemical Society, Columbus, OH, 1996), pp. 229-242.
    • (1996) Mineral Spectroscopy: A Tribute to Roger Burns , pp. 229-242
    • Chopelas, A.1
  • 24
    • 3542993498 scopus 로고    scopus 로고
    • note
    • Raman and fluorescence spectra from the samples were excited with the 457.9-nm line of a Spectra Physics 2025-5 argon ion laser. The laser light entered the diamond cell at an incident angle of 25° and was focused to a 15-μm spot on the sample with powers ranging from 5 to 100 mW depending on pressure. The signal was detected with a liquid nitrogen-cooled CCD detector or a photomultiplier. Spectra were taken at room temperature from the laser-heated spot.
  • 25
    • 3543022950 scopus 로고
    • 3+ on part per million levels in MgO crystals has been detected by this method [A. M. Glass, J. Chem. Phys. 46, 2080 (1967)].
    • (1967) J. Chem. Phys. , vol.46 , pp. 2080
    • Glass, A.M.1
  • 27
    • 3543018752 scopus 로고    scopus 로고
    • note
    • We thank A. Chopelas, O. Tschauner, V. Hillgren, and L. Nigay for many helpful discussions.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.