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GdAlO3 perovskite.
Douglas du Boulay1, Nobuo Ishizawa, Edward Ted N Maslen
1Nagoya Institute of Technology, 10-6-29 Asahigaoka, Tajimi, Gifu 507-0071, Japan.
Acta Crystallographica. Section C, Crystal Structure Communications
|December 8, 2004
Summary
Gadolinium aluminate perovskite (GdAlO(3)) exhibits orthorhombic Pnma symmetry. Its structural distortions align with trends observed in rare earth aluminate perovskite series.
Area of Science:
- Solid State Chemistry
- Crystallography
- Materials Science
Background:
- Rare earth aluminate perovskites (RAlO(3)) feature a robust framework of corner-linked AlO(6) octahedra.
- These octahedra distort to accommodate diverse rare earth ions within the crystal structure.
- Understanding these distortions is key to predicting material properties.
Purpose of the Study:
- To determine the crystal structure and symmetry of flux-grown gadolinium aluminate perovskite (GdAlO(3)).
- To analyze the octahedral distortions and deformations in GdAlO(3).
- To compare the structural characteristics of GdAlO(3) with other rare earth aluminate perovskites.
Main Methods:
- Single-crystal X-ray diffraction using synchrotron radiation (0.7 angstroms wavelength).
- Analysis of crystallographic data to determine space group and atomic positions.
- Quantitative characterization of octahedral tilting and deformation.
Main Results:
- GdAlO(3) crystallizes in the orthorhombic space group Pnma.
- The determined symmetry is consistent with established trends for rare earth aluminate perovskites.
- Octahedral tilting and deformation parameters were quantified and found to be in agreement with systematic trends.
Conclusions:
- The structural analysis of GdAlO(3) confirms its orthorhombic Pnma symmetry.
- GdAlO(3) fits seamlessly into the established structural hierarchy of rare earth aluminate perovskites.
- The study validates predictive trends in octahedral distortion within the RAlO(3) series.