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Structured diffuse scattering, displacive flexibility and polymorphism in Ba-hexacelsian

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Abstract

 The results of a temperature-dependent electron diffraction study of the low frequency modes of distortion of Ba-hexacelsian and their relationship to the α-β polymorphic phase transition therein are presented. Cs- and Rb-doped Ba-hexacelsian specimens are also investigated. An extremely strong and characteristic diffuse intensity distribution in the form of polarized sheets of diffuse intensity perpendicular to the <1 1 0> directions is found for the high temperature polymorph and the doped specimens. The diffuse distribution appears to result from coupled tetrahedral rotation of <1 1 0> columns of corner-connected (Al,Si)O4 tetrahedra about the [0 0 1] axis (uncorrelated from column to column as a result of the positioning of the rotation axes).

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Authors and Affiliations

  1. Research School of Chemistry, Australian National University Canberra, ACT, 0200 Australia Fax: (61) (2) 62490750 e-mail: withers@rsc.anu.edu.au, , , , , , AU

    Y. Tabira & R. L. Withers

  2. College of Humanities and Sciences, Nihon University 3-25-40, Sakurajosui, Setagayaku, Tokyo 156-8550 Japan, , , , , , JP

    Y. Takéuchi & F. Marumo

Authors
  1. Y. Tabira
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  2. R. L. Withers
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  3. Y. Takéuchi
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  4. F. Marumo
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Received: 25 January 1999 / Revised, accepted: 13 July 1999

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Tabira, Y., Withers, R., Takéuchi, Y. et al. Structured diffuse scattering, displacive flexibility and polymorphism in Ba-hexacelsian. Phys Chem Min 27, 194–202 (2000). https://doi.org/10.1007/s002690050007

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  • DOI: https://doi.org/10.1007/s002690050007

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