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Structure and Low-temperature Thermal-conductivity of Pyrolytic Boron-nitride

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Duclaux, Laurent [UCL] Nysten, Bernard [UCL] Issi, Jean-Paul [UCL] Moore, A. W.

The microstructure and morphology of three samples of pyrolytic boron nitride deposited at different temperatures have been characterized with use of x-ray diffraction and thermal-conductivity measurements. The x-ray analysis allowed the determination of the mean interlayer spacing, the out-of-plane coherence length, and the crystallites preferred orientation. It revealed the presence of three distinct morphologies. The thermal conductivity was measured as a function of temperature in the range 1. 5 < T < 300 K. The temperature variations of the thermal conductivity were fitted by using a model previously developed for the analysis of the thermal conductivity of graphites and carbons. This fit allowed the determination of the in-plane coherence length. It also allowed the analysis of point-defect concentration and of the interlayer shear modulus. It is shown that low-temperature thermal-conductivity measurements may be used to complement x-ray diffraction data for the microstructural characterization of materials.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 1992
Language Anglais
Journal information "Physical Review. B, Condensed Matter" - Vol. 46, no. 6, p. 3362-3367 (1992)
Peer reviewed yes
Publisher American Physical Soc (College Pk)
issn 0163-1829
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Links
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Bibliographic reference Duclaux, Laurent ; Nysten, Bernard ; Issi, Jean-Paul ; Moore, A. W.. Structure and Low-temperature Thermal-conductivity of Pyrolytic Boron-nitride. In: Physical Review. B, Condensed Matter, Vol. 46, no. 6, p. 3362-3367 (1992)
Permanent URL http://hdl.handle.net/2078.1/50281