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- W2011121001 abstract "The phonon component of thermal diffusivity ( D ) was measured from 8 single-crystals and 2 polycrystalline clinopyroxene samples at temperatures ( T ) up to a maximum of ~1000 to 1600 K, using laser-flash analysis. Electron microprobe analysis shows that we have two samples of near end-member diopside, two augites, one end-member and one impure jadeite, aegerine, and three near end-member spodumenes. Hydroxyl contents determined from near-IR spectroscopy range from ~ 0 to 70 ppm as H 2 O. Two directions constrain D for clinopyroxenes, consistent with phonon symmetry. Anisotropy = ( D ⊥c − D ||c )/ D ||c is near 40 % for all samples and independent of T , where || and ⊥ indicate the direction heat flows relative to the c -axis. Thermal diffusivity decreases with increasing T and approaches a constant ( D sat ) near 1400 K. The temperature dependence of 1/ D is well described by low-order polynomial fits. At 298 K and for near end-member compositions, cation mass and bond lengths strongly affect D ⊥c whereas D ||c is essentially constant and large, 3.9 mm 2 s −1 . For solid solutions, D at 298 K decreases from end-member values as impurity content increases, but D at saturation is little affected. Excluding Li-rich clinopyroxenes, D ⊥c,sat ~ 0.5 mm 2 s −1 and D ||c,sat ~ 0.9 mm 2 s −1 . The values pertain to lithospheric and mantle compositions of clinopyroxene above 1400 K, and lead to bulk thermal conductivity at saturation being 2.4 W m −1 K −1 . Pressure deriviatives are predicted from models as ∂(ln k )/∥ P = 4.2 to 4.7 %GPa −1 ." @default.
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- W2011121001 date "2008-08-29" @default.
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- W2011121001 title "Thermal diffusivity of clinopyroxenes at elevated temperature" @default.
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- W2011121001 doi "https://doi.org/10.1127/0935-1221/2008/0020-1814" @default.
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