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J. Korean Ceram. Soc. > Volume 40(11); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(11): 1058.
doi: https://doi.org/10.4191/kcers.2003.40.11.1058
Synthesis and Characterization of Gallium Nitride Powders from a Gallium(III) Sulfate Salt in Flowing Ammonia
Woo-Sik Jung
School of Chemical Engineering and Technology, College of Engineering, Yeungnam University
Gallium Nitride (GaN) powders were synthesized by calcining a gallium(III) sulfate salt in flowing ammonia in the temperature range 500-1100$^{circ}C$. The process of conversion of the salt to GaN was monitored by X-Ray Diffraction (XRD). The salt decomposed to ${gamma}$-Ga$_2$O$_3$ and then converted to GaN without ${gamma}$-${beta}$Ga$_2$O$_3$ phase transition. Variations in XRD patterns and weight loss of samples with temperature indicate that the conversion of ${gamma}$-Ga$_2$O$_3$ to GaN does not proceed through Ga$_2$O but stepwise via amorphous gallium oxynitride (GaO$_$x/N$_$y/) as intermediates. Room-temperature photoluminescence spectra of GaN powders obtained showed the emission peak at 363 nm and no yellow band.
Key words: Gallium nitride, Gallium(III) sulfate, Powders, Gallium oxynitride, Photoluminescence
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