Crystal structure of hexagonal SrAl2O4 at 1073 K |
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Authors: | Koichiro Fukuda Kentaro Fukushima |
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Affiliation: | Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan |
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Abstract: | The crystal structure of SrAl2O4 at 1073 K was determined from conventional X-ray powder diffraction data using direct methods, and it was further refined by the Rietveld method. The structure was hexagonal (space group P63, Z=6) with a=0.89260(3) nm, c=0.84985(2) nm and V=0.58639(3) nm3. Final reliability indices were Rwp=7.87%, Rp=5.87% and RB=4.19%. The [AlO4] tetrahedra are linked to form trigonally distorted rings and they are joined in layers. These layers are stacked with a two-layer repeat and connected by the tetrahedral apices. All of the Sr atoms occupy the centers of the rings when viewed along the c-axis. The structure is described as a stuffed derivative of tridymite. |
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Keywords: | Strontium aluminate High-temperature XRD Rietveld method Superstructure Stuffed tridymite derivative |
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