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GaN single crystals were synthesized at 750-775 o C and 5MPa of N 2 for 200-300h using Na-Ga melts with the mole fractions of Na/(Ga+Na) of 0.60-0.67 in the starting melt. When 99% pure Na was used, almost all the melt surface was covered with a GaN polycrystalline layer which prevented the single crystal growth. By using 99.95% Na, no polycrystalline layer formed and GaN single crystals...
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