The Crystal Structure of κ′-Al2O3, the New Intermediate Phase

Abstract

Abstract A structure model of κ′-Al2O3 has been obtained by means of X-ray powder diffraction data. An hexagonal unit cell with a=5.544 and c=9.024 Å and containing 5\frac13 A2O3 was assumed. The oxygen arrangement is the same close packed structure as that of tohdite, and 10\frac23 aluminium atoms are statistically distributed over several octahedral and tetrahedral positions. The R factor for the reflection intensity is 0.13 for 115 reflections.