The atomic structure of amorphous Si3N4-BN composite prepared by CVD has been investigate by neutron total scattering. The small angle scattering intensity observed previously in S(Q) of amorphous Si3N4 has not been observed in case of amorphous Si3N4-BN composite. This may show that the voids of about 10 A in diameter, contained in amorphous Si3N4, are occupied by turbostratic BN in amorphous Si3N4-BN composite. This turbostratic BN can be presumed to be built of frustrated hexagonal layers, based on the coordination number and bond length of the B-N first neighbor correlation.
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