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Mullite-type Ga~4~B~2~O~9~: structure and order–disorder phenomenon by Rihong Cong; Tao Yang; Kuo Li; Hongmei Li; Liping You; Fuhui Liao; Yingxia Wang; Jianhua Lin is a Chemistry article available to read on EtoBox.

What is Mullite-type Ga~4~B~2~O~9~: structure and order–disorder phenomenon about?

Ga~4~B~2~O~9~, an aluminium-free mullite-type compound, was prepared by a boric-acid flux method and its structure was determined using powder X-ray diffraction techniques, in combination with transmission electron microscopy, solid-state ^11^B MAS-NMR and IR spectroscopies. GaO~6~ octahedra share edges in a __trans__-manner forming one-dimensional chains along the __b__ direction, and the chains are further cross-linked by GaO~5~, BO~3~ and BO~4~ groups into a three-dimensional mullite-type structure. The disorder of the inter-chain groups results in a small unit cell for Ga~4~B~2~O~9~ compared with that for Al~4~B~2~O~9~, an ordered compound with a superstructure. By deconstructing the structure of Ga~4~B~2~O~9~, we were able to identify the fundamental building units and their linking rules which can be used to reconstruct the ordered and disordered structures. For Ga~4~B~2~O~9~, we found that the structure is intrinsically disordered within the __ac__ plane, but ordered along the __b__ axis. The three-dimensional structure can then be constructed by stacking the disordered __ac__ sheets along the __b__ axis (1⁄2__b__) with a 1⁄2__a__ shift. The fundamental building units and ex

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Author

Rihong Cong; Tao Yang; Kuo Li; Hongmei Li; Liping You; Fuhui Liao; Yingxia Wang; Jianhua Lin

Publisher

International Union of Crystallography; Blackwell Publishing Inc.; International Union of Crystallography (IUCr) (ISSN 0108-7681)

Published

2010

Language

EN

Field

Chemistry (Physical Sciences)