Materials Transactions Online

Materials Transactions, Vol.46 No.08 (2005) pp.1807-1809
© 2005 The Japan Institute of Metals

Isotopic Effect on Thermal Conductivity of Diamond Thin Films

Tetsuji Noda1, Hiroshi Araki1, Hiroshi Suzuki1, Wen Yang1 and Takefumi Ishikura2

1National Institute for Materials Science, Tsukuba 305-0047, Japan
2Tokyo Gas Co., Ltd., Yokohama 230-0045, Japan

The thermal conductivities of 99.95%12C and natural diamond films at temperatures from 1.5 to 300 K were studied. The thermal conductivity was measured by a steady heat-flow method. The thermal conductivity of 12C enriched diamond was increased compared to that of natural isotope abundant diamond. Its maximum value was about 1.4 times higher than that of the natural isotope-abundant diamond at around 180 K. The increase in thermal conductivity for the isotope diamond can be explained by Callaway's model, that is, by lowering the isotope-scattering effect.

(Received 2005/3/31; Accepted 2005/6/8; Published 2005/8/15)

Keywords: thermal conductivity, diamond film, isotope scattering, Callaway model

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