On the microstructure and symmetry of apparently hexagonal BaAl2O4

作者: A.-K. Larsson , R.L. Withers , J.M. Perez-Mato , J.D. Fitz Gerald , P.J. Saines

DOI: 10.1016/J.JSSC.2008.03.043

关键词:

摘要: Abstract The P 6 3 ( a =2 p , b c = ) crystal structure reported for BaAl 2 O 4 at room temperature has been carefully re-investigated by combined transmission electron microscopy and neutron powder diffraction study. It is shown that the poor fit of this model to data primarily due failure take into account coherent scattering between different domains related enantiomorphic twinning 22 parent sub-structure. Fast Fourier transformation [0 0 1] lattice images from small localized real space regions (∼10 nm in diameter) are used show not correct on local scale. symmetry very nano-domains most likely orthorhombic or monoclinic.

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