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Preparation of ZnGa 2 O 4 Spinel Fine Particles by the Hydrothermal Method
Author(s) -
Hirano Masanori,
Imai Mikimasa,
Inagaki Michio
Publication year - 2000
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/j.1151-2916.2000.tb01310.x
Subject(s) - spinel , hydrothermal circulation , crystallite , stoichiometry , aqueous solution , lattice constant , materials science , hydroxide , solid solution , mineralogy , gallium , nanoparticle , sulfate , inorganic chemistry , chemical engineering , chemistry , nanotechnology , metallurgy , diffraction , physics , optics , engineering
ZnGa 2 O 4 fine particles with a single phase of spinel were synthesized from a mixed solution of gallium sulfate and zinc sulfate in the presence of aqueous ammonia under hydrothermal conditions above 180°C. The effects of treatment temperature and ZnO/Ga 2 O 3 molar ratio in the starting solution on the crystallite size, morphology, lattice parameter, and chemical composition of the ZnGa 2 O 4 spinel particles were examined. Spinel with different morphologies, cubic nanoparticles, and elongated rodlike particles were thought to be formed based on the structure of amorphous gallium hydroxide and needlelike GaO(OH) particles, respectively. By treatment at a higher temperature, these particles with nonstoichiometric composition grew large and thick, and their composition approached ZnO/Ga 2 O 3 = 1. With an increase in the starting ZnO/Ga 2 O 3 molar ratio, the lattice parameter of the synthesized ZnGa 2 O 4 spinel approached the reported value for the stoichiometric composition and reached a = 0.8335 nm at ZnO/Ga 2 O 3 = 1.95 by treatment at 240°C for 50 h.