Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 181, Issue 8, Pages 1816-1823Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2008.03.043
Keywords
BaAl2O4; crystal structure; TEM; neutron diffraction; symmetry
Funding
- Australian Research Council
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The P6(3) (a = 2a(P), b = 2b(P), c = c(P)) crystal structure reported for BaAl2O4 at room temperature has been carefully re-investigated by a combined transmission electron microscopy and neutron powder diffraction study. It is shown that the poor fit of this P63 (a = 2a(P) b = 2b(P), c = c(P)) structure model for BaAl2O4 to neutron powder diffraction data is primarily due to the failure to take into account coherent scattering between different domains related by enantiomorphic twinning of the P6(3)22 parent substructure. Fast Fourier transformation of [001] lattice images from small localized real space regions (similar to 10 nm in diameter) are used to show that the P63 (a = 2a(P), b = 2b(P), c = c(P)) crystal structure reported for BaAl2O4 is not correct on the local scale. The correct local symmetry of the very small nano-domains is most likely orthorhombic or monoclinic. (C) 2008 Elsevier Inc. All rights reserved.
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