Journal
PHYSICAL REVIEW B
Volume 72, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.085218
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The thermal expansion of hexagonal GaN bulk crystals was studied in an extended temperature range from 12 to 1025 K. The lattice parameters a and c were measured by high-resolution x-ray diffraction. The temperature dependence of the derived thermal expansion coefficients along the a and c directions could be well described over the entire temperature range within both the Debye model and the Einstein model. Debye temperatures of (868 +/- 20) K and (898 +/- 24) K and Einstein temperatures of (636 +/- 13) K and (662 +/- 18) K were derived along the a and c axes, respectively, and compared to available literature values.
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