The aluminum-rich part of the system BaO-Al{sub 2}O{sub 3}-MgO. 2: Crystal structure of the {beta}-alumina-related compound, Ba{sub 2}Mg{sub 6}Al{sub 28}O{sub 50}

Journal Article · Sun Mar 01 04:00:00 EST 1998 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1997.7697· OSTI ID:642171

Iyi, Nobuo; Kimura, Shigeyuki ^[1]; Goebbels, M ^[2]

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1. National Inst. for Research in Inorganic Materials, Tsukuba, Ibaraki (Japan)
2. RWTH, Aachen (Germany). Inst. fuer Kristallographie

The crystals of a new phase, Ba{sub 2}Mg{sub 6}Al{sub 28}O{sub 50}, recently confirmed to exist in the system BaO-Al{sub 2}O{sub 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 P{bar 6}m2 with lattice parameters a = 5.638 {angstrom} and c = 31.983 {angstrom}. Structure refinement revealed stacking of conduction layers of the {beta}-alumina-type (BaO) separated by an extended spinel block ((Al,Mg){sub 17}O{sub 24}). This is the same structure with Na{beta}{prime}{prime}{prime}-alumina whose ideal formula is Na{sub 2}O{center_dot}4MgO{center_dot}15Al{sub 2}O{sub 3} (Na{sub 2}Mg{sub 4}Al{sub 30}O{sub 50}).

• OSTI ID: 642171
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 136; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BARIUM OXIDES
CRYSTAL STRUCTURE
ELECTRON MICROPROBE ANALYSIS
EXPERIMENTAL DATA
LATTICE PARAMETERS
MAGNESIUM OXIDES
MONOCRYSTALS
X-RAY DIFFRACTION