Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-14372
Kiebach, R; Pienack, N; Bensch, W; Grunwaldt, J D; Michailovski, A; Baiker, A; Fox, T; Zhou, Y; Patzke, G R (2008). Hydrothermal formation of W/Mo-oxides: A multidisciplinary study of growth and shape. Chemistry of Materials, 20(9):3022-3033.
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The hydrothermal formation of mixed nanoscale W/Mo-oxides with the hexagonal tungsten bronze (HTB) structure has been investigated by in situ EDXRD (energy dispersive X-ray diffraction). Compared to the binary oxide systems, they display intermediate kinetics with a nucleation-controlled mechanism dominated by the slow growing tungsten component. Furthermore, the thermal stability of nanostructured W/Mo-HTB compounds has been monitored through combined in situ X-ray absorption spectroscopy (XAS) and XRD in reducing and oxidizing atmospheres. Their transformation into other mixed nanostructures was only observed above 300 °C in O2- and H2-containing atmospheres. In addition, the shape of nanoscale hexagonal W/Mo-oxides can be expanded into a variety of morphologies via the use of alkali chlorides as hydrothermal additives. The alkali cations exert a two-fold role as internal stabilizers and external shape control agents. Their mobility within the channels of the W/Mo-oxide host framework has been investigated by solid state NMR spectroscopy.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Deposited On:||21 Feb 2009 19:10|
|Last Modified:||28 Nov 2013 02:01|
|Publisher:||American Chemical Society|
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