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Rigid unit modes (RUMs) of distortion, local crystal chemistry and the inherent displacive flexibility of microporous AlPO4-11

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Date

2003

Authors

Liu, Yun
Withers, Raymond

Journal Title

Journal ISSN

Volume Title

Publisher

Academic Press

Abstract

Electron diffraction is used to investigate the average structure of microporous AlPO4-11 as well as the zero-frequency rigid unit mode (RUM) modes of distortion of the ideal AlPO4-11 tetrahedral framework. Direct experimental evidence (in the form of a highly structured, characteristic diffuse intensity distribution) has been found for the (presumably dynamic) excitation of numerous zero-frequency RUM modes of distortion. The lattice dynamic program CRUSH is used to confirm the existence of zero-frequency RUM modes of distortion with wave-vectors falling on the observed diffuse distribution. The simultaneous (presumably dynamic) excitation of such RUM modes of distortion needs to be taken into account in order for the local crystal chemistry of AlPO4-11 to be understood.

Description

Keywords

Keywords: Crystal lattices; Crystal structure; Electron diffraction; Porous materials; Diffuse intensity distribution; Rigid unit modes (RUM); Aluminum compounds; aluminum phosphate; article; chemical structure; correlation analysis; crystal structure; diffusion; e Characteristic diffuse distribution; Correlated tetrahedral rotation; Dynamical disorder; Microporous AlPO4-11

Citation

URI

http://hdl.handle.net/1885/87847

Collections

ANU Research Publications

Source

Journal of Solid State Chemistry

Type

Journal article

Book Title

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DOI

10.1016/S0022-4596(03)00024-0

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