Abstract
The crystal structure of Na + ß-alumina after lengthy exposure to ambient atmosphere has been studied by single-crystal X-ray diffraction, and the results compared with the structure of “dry” Na + ß-alumina. The water molecule is found close to the aBR-site, forming 2.573(4) Å O w⋯O(4) hydrogen bonds to the spinel-block oxygen. Some depletion of the Frenkel defect is noted, along with a redistribution of the also somewhat depleted Na + content; the effective refines composition is Na 1.14Al 11O 17.07·0.39H 2O. The water content is consistent with IR measurements, although these predict a somewhat longer O w⋯O distance.
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