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Crystal structure of synthetic Al4B2O9 : a member of the mullite family closely related to boralsilite
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Fischer, R. X. (Reinhard X.), Kahlenberg, Volker, Voll, Dietmar, MacKenzie, Kenneth J. D., Smith, Mark E., Schnetger, Bernhard, Brumsack, Hans-Juergen and Schneider, Hartmut (2008) Crystal structure of synthetic Al4B2O9 : a member of the mullite family closely related to boralsilite. The American Mineralogist, Vol.93 (No.5-6). pp. 918-927. doi:10.2138/am.2008.2744 ISSN 0003-004X.
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Official URL: http://dx.doi.org/10.2138/am.2008.2744
Abstract
The crystal structure of Al4B2O9, synthesized from Al(NO)(3)center dot 9H(2)O and B(OH)(3) via a sol-gel process, is studied and characterized by Rietveld refinements and grid search analyses combined with (11) B and Al-27 MAS NMR spectroscopy. The aluminum borate with a unit-cell composition of Al32B16O72 is closely related to the boralsilite (Al32B12Si4O74) Structure with Si replaced by B and to mullite (Al4+2xSi2-2xO10-x) It crystallizes in the monoclinic space group C2/m, a = 14.8056(7) angstrom, b = 5.5413(2) angstrom, c = 15.0531(6) angstrom, beta = 90.913(2)degrees, Z = 8 for Al4B2O9. The main structural units are isolated chains of edge-sharing AlO6-octahedra running parallel to b that is a characteristic feature of the mullite-type crystal structures. The octahedral chains are crosslinked by AlO4, AlO5, BO3, and BO4 groups with two B atoms and one O atom (O5') disordered on interstitial positions. Al-27 and B-11 NMR studies confirm the presence of sixfold (octahedral), fivefold, and fourfold (tetrahedral) coordinated Al (sixfold: [fourfold + fivefold] =similar to 50%:50%) and of threefold and fourfold coordinated B (similar to 80%:20%).
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QD Chemistry Q Science > QE Geology |
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| Divisions: | Administration > University Executive Office Faculty of Science, Engineering and Medicine > Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Borates, Aluminum, Crystallography, Rietveld method, Nuclear magnetic resonance spectroscopy | ||||
| Journal or Publication Title: | The American Mineralogist | ||||
| Publisher: | Mineralogical Society of America | ||||
| ISSN: | 0003-004X | ||||
| Official Date: | May 2008 | ||||
| Dates: |
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| Volume: | Vol.93 | ||||
| Number: | No.5-6 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | pp. 918-927 | ||||
| DOI: | 10.2138/am.2008.2744 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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