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The X-ray powder diffraction patterns of the two phases, a and fl, of each of the nitrides Si3N 4 and Ge3N4 have been separated and indexed. The structure of the fl phase is confirmed to be of the phenacite (B%SiO4) type. A structure for the a phase is proposed which is related to that of the # phase.
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Ruddlesden et al. (1958) studied this question.
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