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The ammonothermal conversion of GaI 3 to both cubic (zinc-blende) and hexagonal GaN was explored in detail. Gallium triiodide, anhydrous NH 3 , and in some cases CuI or LiI co-mineralizers, were sealed in quartz tubes and heated in a pressurized autoclave from 300°C to 515°C. At hot-zone temperatures above 430°C, a deposit of mostly c-GaN collects in the upper portion of the tube,...
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