Crystal structure of the new magnetoplumbite-related compound in the system SrO-Al{sub 2}O{sub 3}-MgO

Journal Article · Thu Feb 15 04:00:00 EST 1996 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1996.0080· OSTI ID:263727

Iyi, Nobuo ^[1]; Goebbels, M ^[2]

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

A new phase in the system SrO-Al{sub 2}O{sub 3}-MgO, which was analyzed by EPMA as Sr{sub 2}MgAl{sub 22}O{sub 36}, was recently found. It is located in the middle of the join connecting strontium hexa-aluminate (SrAl{sub 12}O{sub 19}) of magnetoplumbite structure and strontium magnesium hexaaluminate (SrMgAl{sub 10}O{sub 17}) of {beta}-alumina structure. The crystals were grown by the floating zone method and its crystal structure was analyzed by using the single crystal X-ray was analyzed by using the single crystal X-ray diffraction method. The space group was P6m2 with lattice parameters {alpha} = 5.583 {Angstrom} and c = 22.225 {Angstrom}. The observed c-axis length is intermediate between those of SrAl{sub 12}O{sub 19} (c = 22.00 {Angstrom}) and SrMgAl{sub 10}O{sub 17} (c = 22.399 {Angstrom}). The structured refinement result has shown that it had the alternate stacking of the conduction layers of magnetoplumbite-type (SrAlO{sub 3}) and {beta}-alumina-type (SrO) separated by a spinel black ((Al, Mg){sub 11}O{sub 16}). This is the first time that such a {open_quotes}mixed-layer{close_quotes} structure of {beta}-alumina and magnetoplumbite is found to exist in the hexaaluminates containing one species of large cation.

• OSTI ID: 263727
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 122; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CRYSTAL STRUCTURE
MAGNESIUM OXIDES
PHASE STUDIES
STRONTIUM OXIDES
X-RAY DIFFRACTION