| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Hydrothermal Formation of W/Mo-Oxides: A Multidisciplinary Study of Growth and Shape
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - The nucleation-controlled hydrothermal formation of hexagonal W/Mo-oxides was monitored with in situ EDXRD methods. Their follow-up thermal treatment in oxidizing and reducing atmospheres was studied through combined in situ EXAFS/XRD techniques. Furthermore, the morphochemistry of W/Mo-oxides can be steered with alkali chloride additives. The mobility of the alkali cations in the hexagonal channels was characterized with solid state NMR spectroscopy.
- 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.
|
| Alternative Title
| - W/Mo-Oxides: Study of Growth and Shape
|
| is part of this journal
| |
