High pure wurtzite structure GaN has been synthesized by gas reaction method. Its structure was determined by powder x-ray diffraction using the Rietveld technique. The heat capacity C-p was measured from 113 to 1073 K, which can be represented by C-p = 0.362 + 3.010 x 10(-4)T - 3.411 x 10(3)T(-2) - 7.791 x 10(-8)T(2). NO measurable phase transition was observed in this temperature range.
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