Compounds of molybdenum and tungsten with high specific surface area: I. Nitrides
Temperature-programmed reaction between MoO 3 or WO 3 with NH 3 provides a new way to prepare Mo 2N and W 2N powders with specific surface areas as high as 220 and 91 m 2 g −1, respectively, corresponding to 3- to 4-nm crystallites. The transformation of MoO 3 platelets is topotactic in the sense th...
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| Published in | Journal of solid state chemistry Vol. 59; no. 3; pp. 332 - 347 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
1985
|
| Online Access | Get full text |
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| Summary: | Temperature-programmed reaction between MoO
3 or WO
3 with NH
3 provides a new way to prepare Mo
2N and W
2N powders with specific surface areas as high as 220 and 91 m
2 g
−1, respectively, corresponding to 3- to 4-nm crystallites. The transformation of MoO
3 platelets is topotactic in the sense that {100} planes of Mo
2N are parallel to {010} planes of MoO
3. As the MoO
3 reacts with NH
3, it passes through an oxynitride intermediate with changing bulk structure, increasing surface area, and decreasing oxidation state of the metal. The product consists of highly porous nitride platelets, pseudomorphous with the original MoO
3. |
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| ISSN: | 0022-4596 1095-726X |
| DOI: | 10.1016/0022-4596(85)90301-9 |