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Figure 1
Crystal structure of β′′-alumina viewed from the side emphasizing the stacking arrangement of close-packed oxygen layers that make up the structure. Spinel-related blocks are identified with D and conduction slabs are identified by H. Large open circles are O2−. Medium-sized shaded circles are Na+. Small solid circles are Al sites. Checkerboard circles are the Al2 site where stabilizer ions substitute.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 2| February 2012| Pages 118-122
doi:10.1107/S0108768112002649
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