Abstract
Hexagonal boron nitride (hBN) single crystals were grown using a Ni–Cr flux growth method. The crystallization cooling rate, soak temperature and soak time were controlled to determine their effect on crystal size and quality. A cooling rate of 2°C/h produced the best quality hBN crystals. The maximum crystal width increased with soak temperature from 1mm at 1450°C to 5mm at 1700°C. The crystal thickness decreased with soak temperature from 500µm at 1500°C to 40µm at 1700°C. A soak time of 24 to 48h produced the maximum crystal thickness. X-ray diffraction and Raman spectroscopy confirmed that the crystals were highly ordered and of high purity.
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