Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 36, Issue 3, Pages 920-925Publisher
BLACKWELL MUNKSGAARD
DOI: 10.1107/S0021889803005375
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Bulk- and nanocrystalline GaN have been studied by high-pressure energy-dispersive X-ray diffraction. Pressure-induced structural phase transitions from the wurtzite to the NaCl phase were observed in both materials. The transition pressure was found to be 40 GPa for the bulk-crystalline GaN, while the wurtzite phase was retained up to 60 GPa in the case of nanocrystalline GaN. The bulk moduli for the wurtzite phases were determined to be 187 ( 7) and 319 ( 10) GPa for the bulk- and nanocrystalline phases, respectively, while the respective NaCl phases were found to have very similar bulk moduli [ 208 ( 28) and 206 ( 44) GPa].
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