Thermal conductivity of CaGeO3 perovskite at high pressure

Details Thermal conductivity of CaGeO3 perovskite at high pressure Thermal conductivity of CaGeO3 perovskite at high pressure

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3808301m&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 8, CiteID L08301

Physics

Mineral Physics: High-Pressure Behavior, Planetary Sciences: Solid Surface Planets: Heat Flow, Tectonophysics: Heat Generation And Transport, Mineralogy And Petrology: Thermodynamics (0766, 1011, 8411)

Scientific paper

The pressure dependence of thermal conductivity (${\cal{K}) in Earth's lower mantle is poorly understood, resulting in very uncertain ${\cal{K} values in the D″. Using orthorhombic CaGeO3 perovskite as an analogue for MgSiO3 perovskite, we measured ${\cal{K} in a multi-anvil apparatus using the Ångström method at pressures of 8, 10, 14 and 18 GPa, and temperatures of 573-1073 K. We find the pressure dependence of thermal conductivity for orthorhombic perovskite shows a somewhat higher slope than that predicted by Debye theory, and account for this by relating phonon velocities to the bulk modulus, rather than to the Debye temperature. From this relation, we estimate the thermal conductivity of MgSiO3 perovskite at the top and bottom of the D″ to be 3.3 W/m K and 2.2 W/m K, corresponding to values of 6.4 W/m K and 4.5 W/m K for the mantle.

Affiliated with

Also associated with

No associations

Rating

Thermal conductivity of CaGeO3 perovskite at high pressure 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 conductivity of CaGeO3 perovskite at high pressure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal conductivity of CaGeO3 perovskite at high pressure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-766350