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We have investigated the effect of sulphur additions on the kinetics of the degree and rate of hexagonal to cubic BN conversion (hBN → cBN) as well as on the linear rate of the cBN crystal growth in the Li-B-N-H system. Experiments were performed in the temperature range 1940-2080 K at a pressure of 4.3 GPa. For 0.5, 1.0 and 3.0 mass.% sulphur addition, the activation energy of the process of cBN...