Bhat, Vasudeva ; Gopalakrishnan, J. (1988) HNbWO6 and HTaWO6: novel layered oxides related to the rutile structure. Synthesis and investigation of ion-exchange and intercalation behaviour Solid State Ionics, 26 (1). pp. 25-32. ISSN 0167-2738
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016727...
Related URL: http://dx.doi.org/10.1016/0167-2738(88)90241-X
Abstract
New protonated layered oxides, HMWO6·1.5H2O (M=Nb or Ta), have been synthesized by topotactic exchange of lithium in trirutile LiMWO6 with protons by treatment with dilute HNO3. The tetragonal cell constants are a=4.71 (2) and c=25.70 (8)Å for HNbWO6·1.5H2O and a=4.70 (2) and c=25.75 (9) Å for HTaWO6·1.5H2O. Partially hydrated compounds, HMWO6·0.5H2O and anhydrous compounds, HMWO6 retain the layered structure. The structure of these oxides consists of MWO6 sheets built up of M/W-oxygen octahedra with rutile type corner- and edge-sharing. Interlayer protons in HMWO6 are exchanged with Li+, Na+, K+ and Tl+. HMWO6 exhibit Bronsted acidity intercalating n-alkylamines and pyridine.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 12287 |
| Deposited On: | 10 Nov 2010 05:15 |
| Last Modified: | 03 Jun 2011 05:15 |
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