On the microstructure and symmetry of apparently hexagonal BaAl2O4

Larsson, A.-K., Withers, R.L., Perez-Mato, J.M., Fitz Gerald, J.D., Saines, P.J., Kennedy, B.J., Liu, Y. (2008) On the microstructure and symmetry of apparently hexagonal BaAl2O4. Journal of Solid State Chemistry, 181 (8). pp. 1816-1823. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2008.03.043) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
https://doi.org/10.1016/j.jssc.2008.03.043

Abstract

The P63 (a=2ap, b=2bp, c=cp) 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=2ap, b=2bp, c=cp) 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 P6322 parent sub-structure. Fast Fourier transformation of [0 0 1] lattice images from small localized real space regions (�10 nm in diameter) are used to show that the P63 (a=2ap, b=2bp, c=cp) 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. © 2008 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2008.03.043
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - Research School of Chemistry, Australian National University, Science Road, Canberra, ACT 0200, Australia [Field not mapped to EPrints] AD - Department of Condensed Matter Physics, University of the Basque Country, Bilbao, Spain [Field not mapped to EPrints] AD - Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia [Field not mapped to EPrints] AD - School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: BaAl2O4, Crystal structure, Neutron diffraction, Symmetry, TEM, BaAl<sub>2</sub>O<sub>4</sub>, Crystal structure, Neutron diffraction, Symmetry, TEM
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Paul Saines
Date Deposited: 07 Oct 2015 10:19 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50739 (The current URI for this page, for reference purposes)
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