Cubic Boron Nitride Films with Low Stress

We report a cubic boron nitride (c-BN) film with low stress. Infrared (IR) peak position of c-BN at 1006.3cm^-1measured by IR spectroscopy shows that the c-BN film has very low internal stress which leads to an excellent adhesion. Transmission electron microscope micrograph indicates the only BN phase on the surface of the film is c-BN phase. It is clearly seen from IR spectra that the intermediate layer between the substrate and the c-BN layer is of the molecular crystal explosion boron nitride, hexagonal boron nitride, and wurtzic boron nitride.