Abstract
A tungsten oxide-nitride with a composition close to the formula W .62N 62O .38has been investigated by analytical and X-ray methods. It was obtained by reducing ammonium paratungstate or tungsten trioxide with ammonia, probably has metallic properties, and belongs to the interstitial compounds. It has a defective MeX-lattice with the sodium chloride structure. Only 62 per cent of the Me-positions, however, are statistically occupied by tungsten atoms, whereas probably all the X-positions are occupied, 62 per cent by nitrogen atoms and 38 per cent by oxygen. The γ-nitride in the tungsten-nitrogen system has also been shown to be an oxide-nitride. This phase has also a defective tungsten lattice, but the vacancies are ordered. Its ideal formula is W .75 (N, O) 1.00, where the ratio N:O is unknown but certainly greater than for W .62N .62O .38. In conclusion there is a short discussion regarding the electronic structure of the oxide-nitrides.
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