尿素存在下の水熱法によるガリウム酸亜鉛スピネルナノ粒子の合成と焼結

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  • Synthesis of Zinc Gallate Spinel Nanoparticles by Hydrothermal Method in the Presence of Urea and Their Sintering.

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Nanometer-sized particles of zinc gallate (ZnGa2O4) spinel solid solutions over wide compositional range (Zn/Ga molar ratio = 0.341-0.499) were directly synthesized from aqueous solutions of gallium and zinc sulfates (Zn/Ga = 0.5-2.0) in the presence of urea under hydrothermal conditions at 120 to 240°C. Under almost neutral conditions in the presence of urea (pH = 7.65), zinc gallate spinel was hydrothermally formed over 200°C, although ZnCO3 and GaO(OH) were formed at 120°C. The synthesized temperature of zinc gallate spinel was able to decrease from 240 to 120°C, with the increase of the concentration of urea from 0.8 to 2.4 mol·dm-3. Zinc gallate spinel with almost stoichiometric composition (Zn/Ga = 0.499) was synthesized from the solution with Zn/Ga = 2 at 240°C. The obtained zinc gallate spinel powder was fully densified by sintering over 1200°C for 1 h.

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