Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..174...78s&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 174, Issue 1-4, p. 78-85.
Physics
1
Scientific paper
In situ X-ray diffraction measurements of CaFe2O4-type MgAl2O4 have been conducted at pressures up to 42 GPa and temperatures to 2400 K using Kawai-type multianvil apparatus with sintered diamond anvils. Additional measurements have also been conducted at pressures to 12 GPa using diamond anvil cell with helium as a pressure medium at room temperature, and at temperatures to 836 K at the ambient pressure using a high-temperature X-ray diffractometer. The analysis of room-temperature data yielded V0 = 240.1(2) Å3, K0 = 205(6) GPa, and K′0=4.1(3). A fit of the present data to high-temperature Birch-Murnaghan equation of state (EOS) yielded (∂K0/∂T)P = -0.030(2) GPa/K and α0 = a0 + b0T with values of a0 = 1.96(13) × 10-5 K-1 and b0 = 1.64(24) × 10-8 K-2. The present data set was also fitted to Mie-Grüneisen-Debye (MGD) EOS and we obtained γ0 = 1.73(7), q = 2.03(37), and θ0 = 1546(104) K. Density changes of MORB have been estimated using the newly obtained thermoelastic parameters, assuming that the Al-rich phase in this composition possesses the CaFe2O4-type structure under the lower mantle P, T conditions. The calculated densities along geotherms for the normal mantle and subducting cold slabs are both significantly higher than those of typical seismological models, confirming the conclusion of some recent results on MORB by laser-heated diamond anvil cell experiments.
Funakoshi Ken-Ichi
Irifune Tetsuo
Kikegawa Takumi
Nishiyama Norimasa
Sanehira Takeshi
No associations
LandOfFree
Thermal equation of state of CaFe2O4-type MgAl2O4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Thermal equation of state of CaFe2O4-type MgAl2O4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal equation of state of CaFe2O4-type MgAl2O4 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1110643