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Synthesis and characterization of α-, β-, and γ-Ga₂O₃ prepared from aqueous solutions by controlled precipitation

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons21806

Li,  Liandi
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences;
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Graduate University of Chinese Academy of Sciences;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21347

Behrens,  Malte
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Li, L., Wei, W., & Behrens, M. (2012). Synthesis and characterization of α-, β-, and γ-Ga₂O₃ prepared from aqueous solutions by controlled precipitation. Solid State Sciences, 14(7), 971-981. doi:10.1016/j.solidstatesciences.2012.04.037.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-221E-6
Abstract
α, β and γ-Ga₂O₃ have been successfully obtained in an easily scalable synthesis using aqueous solution of gallium nitrate and sodium carbonate as starting materials without any surfactant and additive. α and β-Ga₂O₃ were obtained by calcination at 350 and 700 °С, respectively, of α-GaOOH, prepared by controlled precipitation at constant pH 6 and T = 55 °С, with 24 h of aging. Aging was necessary to fully convert the initially preciptated gel into a well-crystalline and phase-pure material. γ-Ga₂O₃ was obtained after calcination at 500 °С of gallia gel, synthesized at constant pH 4 and T = 25 °С, without aging. These three polymorphs have a for gallia relatively high surface area: 55 m²/g (α-Ga₂O₃), 23 m²/g (β-Ga₂O₃) and 116 m²/g (γ-Ga₂O₃). The combination of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), nitrogen physisorption and thermogravimetry (TG) was employed to characterize the samples and their formation.