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

Y. Tabira; R. L. Withers; Y. Takéuchi; F. Marumo

doi:10.1007/s002690050007

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

Y. Tabira, R. L. Withers^*, Y. Takéuchi, F. Marumo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

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 pears 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).

Original language	English
Pages (from-to)	194-202
Number of pages	9
Journal	Physics and Chemistry of Minerals
Volume	27
Issue number	3
DOIs	https://doi.org/10.1007/s002690050007
Publication status	Published - Feb 2000

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

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 pears 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).",

keywords = "Correlated tetrahedral rotation, Diffuse distribution, Dynamical disorder, Hexacelsian, Polymorphism",

author = "Y. Tabira and Withers, {R. L.} and Y. Tak{\'e}uchi and F. Marumo",

year = "2000",

month = feb,

doi = "10.1007/s002690050007",

language = "English",

volume = "27",

pages = "194--202",

journal = "Physics and Chemistry of Minerals",

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TY - JOUR

T1 - Structured diffuse scattering, displacive flexibility and polymorphism in Ba-hexacelsian

AU - Tabira, Y.

AU - Withers, R. L.

AU - Takéuchi, Y.

AU - Marumo, F.

PY - 2000/2

Y1 - 2000/2

N2 - 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 pears 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).

AB - 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 pears 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).

KW - Correlated tetrahedral rotation

KW - Diffuse distribution

KW - Dynamical disorder

KW - Hexacelsian

KW - Polymorphism

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U2 - 10.1007/s002690050007

DO - 10.1007/s002690050007

M3 - Article

SN - 0342-1791

VL - 27

SP - 194

EP - 202

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 3

ER -

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

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