학술논문
Lattice parameters and anisotropic thermal expansion of hexagonal boron nitride in the 10–297.5 K temperature range.
Document Type
Article
Author
Source
Subject
*ANISOTROPY
*BORON nitride
*RADIATION
*THERMAL analysis
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Language
ISSN
0947-8396
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. [ABSTRACT FROM AUTHOR]