Does someone know about proposed models for chemical vapor transport during WOx reduction?

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Bhaskar Sengupta

you can try reducing core model..provided you can do shrinkage in DEM

Stefan Luidold

The chemical vapour transport occurs via gaseous WO2(OH)2, similar to molybdenum oxide reduction (MoO2(OH)2.

Lassner and Schubert: Tungsten: properties, chemistry, technology of the element, alloys, and chemical compounds, Kluwer Academic/Plenum Publishers (1999)

Schulmeyer et al. Int. Journal of RM&HM 20 (2002) 261-269

Etc.