Synchrotron radiation studies of the kinetics of cBN crystallization in the NH4F–BN system

Literature Information

Publication Date 2002-02-06
DOI 10.1039/B107483K
Impact Factor 3.676
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Abstract

The kinetics of the spontaneous crystallization of cubic boron nitride from the melt of the NH4F–BN system at high pressures and temperatures have been studied in situ using X-ray diffraction with synchrotron radiation. The crystallization is limited by the volume diffusion of BN in the melt and its apparent activation energy is 207 ± 6 kJ mol−1. The kinetic data are best fitted by a model that assumes instantaneous nucleation in the initial stage of the crystallization, and nucleation at a constant rate in the subsequent stage.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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