Lattice parameters and anisotropic thermal expansion of hexagonal boron nitride in the 10–297.5 K temperature range |
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Authors: | W Paszkowicz JB Pelka M Knapp T Szyszko S Podsiadlo |
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Institution: | (1) Institute of Physics, Polish Academy of Science (PAS), Al. Lotnikow 32/46, 02-668 Warsaw, Poland, PL;(2) Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, 64287 Darmstadt, Germany, DE;(3) Faculty of Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warsaw, Poland, PL |
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Abstract: | Lattice parameters for hexagonal boron nitride (hBN) were determined using X-ray powder diffraction at a synchrotron-radiation
source (beamline B2, Hasylab/DESY, Hamburg) in the previously uninvestigated temperature range from 10 K up to 297.5 K. The
relative change of a and c with rise of temperature in the studied range is anisotropic and amounts to about -0.05% and +0.82%,
respectively. The corresponding increase of the unit-cell volume is 0.73%. The evaluated values of thermal expansion coefficients
derived from the lattice-parameter dependences on temperature are generally consistent with earlier data determined by interferometryfor
T≥82 K.
Received: 25 July 2001 / Accepted: 9 August 2001 / Published online: 17 October 2001 |
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Keywords: | PACS: 65 40 De |
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