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The Aluminum-Rich Part of the System BaO–Al2O3–MgO: II: Crystal Structure of theβ-Alumina-Related Compound, Ba2Mg6Al28O50

✍ Scribed by Nobuo Iyi; Matthias Göbbels; Shigeyuki Kimura

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
281 KB
Volume
136
Category
Article
ISSN
0022-4596

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✦ Synopsis

The crystals of a new phase, Ba 2 Mg 6 Al 28 O 50 , recently confirmed to exist in the system BaO-Al 2 O 3 -MgO, were grown by the floating zone method, and its crystal structure was determined by using single-crystal X-ray diffraction. The space group was P6 m2 with lattice parameters a ‫؍‬ 5.638 A s and c ‫؍‬ 31.983 A s . Structure refinement revealed stacking of conduction layers of the -alumina-type (BaO) separated by an extended spinel block ((Al,Mg) 17 O 24 ). This is the same structure with Na -alumina whose ideal formula is Na 2 O • 4MgO • 15Al 2 O 3 (Na 2 Mg 4 Al 30 O 50 ).

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