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Novel Metastable Structures of WO3, MoO3 and W1-xMoxO3 Obtained by the Deintercalation of Layered Amine Adducts

Ayyappan, S and Subbanna, GN and Rao, CNR (1995) Novel Metastable Structures of WO3, MoO3 and W1-xMoxO3 Obtained by the Deintercalation of Layered Amine Adducts. In: Chemistry - A European Journal, 1 (3). pp. 165-170.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/chem.19...

Abstract

Deintercalation of amines from the layered amine adducts of WO3, MoO3 and W1-xMoxO3 has been employed as a soft chemical route to produce unusual metastable structures of the oxides. After the adducts of WO3, MoO3 and W1-xMoxO3 (x = 0.25, 0.5, 0.75) with amines such as triethylamine (TEA), pyridine, n-butylamine and n-octylamine had been characterized, deintercalation was carried out thermally as well as by acid leaching. Thermal deintercalation yielded novel metastable structures of WO3 and MoO3 that were significantly different from the stable forms, which contain distorted metal-oxygen octahedra. Thus, ReO3-type cubic WO3 was obtained by the thermal deintercalation of WO3 . 0.5 TEA. Acid leaching of the amines gave metastable phases of WO3, MoO3 and W1-xMoxO3, which were different from those obtained thermally. All the metastable phases transformed to the corresponding stable forms at higher temperatures.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Keywords: acid leaching;deintercalation;layered oxides;metastable oxides;molybdenum compounds;tungsten compounds
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Jun 2011 05:47
Last Modified: 02 Jun 2011 05:47
URI: http://eprints.iisc.ernet.in/id/eprint/38131

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