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Phase Evolution of Ga 2 O 3 Produced from Morphology‐Controllable α‐ GaOOH Nanocrystals
Author(s) -
Shi Lihui,
Zhang Jian,
Wu Si,
Li Yingai,
Jiang Lina,
Cui Qiliang
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12953
Subject(s) - nanocrystal , nanorod , materials science , morphology (biology) , chemical engineering , hexagonal crystal system , phase (matter) , pulmonary surfactant , crystallography , hydrolysis , nanotechnology , chemistry , organic chemistry , genetics , engineering , biology
Fine powders of GaOOH nanocrystals are synthesized via a facile hydrolysis process through the solution–solution interface reactions of anhydrous GaCl 3 and distilled water followed by subsequent solvothermal treatment at mild conditions. Well‐faceted α‐ GaOOH hexagonal prism‐like nanorods are prepared through solvothermal treatment at 180°C with CTAB as the morphology controlling surfactant. Ga 2 O 3 nanocrystals are fabricated via the pyrolysis of α‐ GaOOH hexagonal prism‐like nanostructures at temperatures above 410°C. A peculiar back‐transformation from β‐ Ga 2 O 3 to α‐ Ga 2 O 3 has been observed to occur between about 557°C and 719°C, which is considered to be responsible for the coexistence of the two phases. The phase transformation mechanisms of Ga 2 O 3 at elevated temperatures, as well as the possible transformation route, have been postulated from a thermodynamic point of view.