A study of the non-stoicheiometric, lime-type phase occurring in the system Ca-O-N

Abstract
A brown, strongly reducing, non-stoicheiometric calcium oxynitride phase has been prepared by heating calcium oxide pellets at about 1100� in an atmosphere of calcium vapour and nitrogen derived from heated calcium nitride. The compositions studied ranged between CaNo.oo4O0.99(2) and CaNo.070O0.82(5). X-ray diffraction patterns were of a face-centred cubic lime-type phase with lattice parameters expanded with respect to that of pure lime; the expansion was a linear function of the nitrogen content. The possible nature of this non-stoicheiometric solid is discussed.

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