Abstract
Single crystals of cubic boron nitride (cBN) were synthesized from amorphous boron nitride (aBN) under static high pressures and temperatures (40–50 kb, 1200–1500°C) using Mg–Al alloy catalyst-solvent material. The weight percentage of magnesium in the alloy powder was about 40%. It was found that aBN containing small amount of B 2O 3 as an oxide impurity transforms easily into cBN (in the thermodynamically stable region of cBN) whereas aBN powder without B 2O 3 did not transform into cBN to the same extent under the similar P– T conditions. It appears therefore, that the presence of oxide impurity in aBN powder facilitates the transformation of aBN into cBN although it does not have any catalytic action for aBN–cBN phase transformation.
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