Large anisotropic thermal conductivity in synthetic diamond films

Article Abstract:

The thermal conductivity of diamond film was determined perpendicular to the film's plane using a new laser technique. The measured conductivity indicates that the film has a gradient and anisotropy correlated with the inhomogeneous grain structure. This yields the unexpected finding that the local conductivity at the top growth surface of a synthetic diamond film is as high as in gem-quality diamond single crystals. Hence synthetic diamond films may be usable as heat spreaders to protect electronic devices from heat damage.

Synthetic diamonds, Artificial diamonds, Diamond films

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Shear-wave splitting and small-scale convection in the continental upper mantle

Article Abstract:

Deformation in the upper mantle under the Tien Shan mountains of Central Asia was measured using seismic azimuthal anisotropy. The highly anisotropic nature of olivine, the most abundant mantle rock, renders azimuthal anisotropy a sensitive detector of mantle deformation. The collisional belt beneath the Tien Shan was found to diverge by 90 degrees from the direction of azimuthal anisotropy. This finding indicates the presence of rising plumes and thermally driven convection in this region.

Models, Usage, Natural history, Anisotropy, Geology, Structural, Structural geology, Tien Shan

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Anistropy of thermal diffusivity in the upper mantle

Article Abstract:

Petrophysical modelling and laboratory analysis of thermal diffusivity in deformed mantle rocks between temperatures of 290 K and 1,250 K show that deformation could prompt a substantial anistropy of thermal diffusivity in the uppermost mantle. As the anistropy does not depend on temperature, it could be preserved under higher-temperature, asthenospheric conditions.

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• Abstracts: Structural control on sea-floor hydrothermal activity at the TAG active mound. Evidence for fault weakness and fluid flow within an active low-angle normal fault

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