Abstract
Transient thermal grating and laser flash techniques have been used to measure in-plane ( k ∣∣) and perpendicular ( k ⊥) thermal conductivity of 0.3–0.6 mm thick polycrystalline MPCVD diamond films. A small (<20% ) anisotropy in k is revealed, and a correlation of k (8–20 W/cm K at RT) with optical absorption and hydrogen impurity concentration is established. The temperature dependence k( T) between 293 and 460 K follows the relationship k∼ T − n ( n=0.17–1.02) depending on the diamond quality.
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