期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 75, 期 3, 页码 431-435出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s003390100999
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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 interferometry for T greater than or equal to 82 K.
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