Freestanding nanocrystalline -Ga 2 O 3 particles with an average grain size of 14 nm prepared by chemical method was investigated by angle-dispersive synchrotron x-ray diffraction in diamond-anvil cell up to 64.9 GPa at ambient temperature. The evolution of x-ray diffraction patterns indicated that nanocrystalline monoclinic -Ga 2 O 3 underwent a phase transition to rhombohedral ␣-Ga 2 O 3 . It was found that -to ␣-Ga 2 O 3 transition began at about 13.6-16.4 GPa, and extended up to 39.2 GPa. At the highest pressure used, only ␣-Ga 2 O 3 was present, which remained after pressure release. A Birch-Murnaghan fit to the P-V data yielded a zero-pressure bulk modulus at fixed B 0 Ј=4: B 0 = 228͑9͒ GPa and B 0 = 333͑19͒ GPa for -Ga 2 O 3 and ␣-Ga 2 O 3 phases, respectively. We compared our results with bulk -Ga 2 O 3 , and concluded that the phase-transition pressure and bulk modulus of nanocrystalline -Ga 2 O 3 are higher than those of bulk counterpart.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.