Thermal conductivity of CVD diamond at elevated temperatures

• Published in: Diamond and related materials Vol. 14; no. 3; pp. 589 - 593
• Main Authors: Sukhadolau, A.V., Ivakin, E.V., Ralchenko, V.G., Khomich, A.V., Vlasov, A.V., Popovich, A.F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2005
• Subjects: Diamond film; Laser flash technique; Thermal conductivity; Transient thermal grating; Thermal conductivity; Diamond film; Transient thermal grating; Laser flash technique
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2004.12.002

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.