Abstract
Summary Conwicke and Day showed that partial solid solution occurs in the system C3A-NC8A3 at temperatures below the liquidus. Their results indicated a marked similarity between the X-ray powder diffraction data for a preparation containing more than 3·0% Na2O and the data given by Moore for a new phase in Portland cements. The present work was almost complete when Conwicke and Day's paper was published. It generally confirms their results but gives more information on the solid solution. At the limit of solid solution at 1,350°C the sodium calcium aluminate which is formed has the composition 91·0 mol % C3A, 9·0 mol % N3A and has been indexed on an orthorhombic unit cell with a = 15·314, b = 15·394, c = 15·137 Å.
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