NDLI: Mullite-type Ga4B2O9: structure and order-disorder phenomenon.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Cong, Rihong Yang, Tao Li, Kuo Li, Hongmei You, Liping Liao, Fuhui Wang, Yingxia Lin, Jianhua
Description	Author Affiliation: Cong R ( Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People's Republic of China.)
Abstract	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 exclusivity rules identified in this gallium borate mullite may also be useful for understanding other related mullite phases. The structure analysis applying the proposed method is used to recognize the structural features of Al(4)B(2)O(9) and Al(18)B(4)O(33).
File Format	HTM / HTML
ISSN	01087681
e-ISSN	16005740
Journal	Acta Crystallographica Section B Structural Science
Issue Number	Pt 2
Volume Number	66
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2010-04-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Analytical Discipline Chemistry Techniques
Content Type	Text
Resource Type	Article
Subject	Biochemistry, Genetics and Molecular Biology

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