An 83 GHz millimeter-wave beam system has been used in several areas of material processing, including sintering, joining, coating and production of nanophase materials via the polyol process. This system has a number of unique features relative to material processing and production. These features have been used to advantage in rapid sintering of ceramics, joining of ceramics and polyol production of nanophase metal and metal oxide materials. With the latter we have been able to prepare powders of single elements, alloys, metastable alloys, composites and coatings. Examples of a few of the metals processed in this study include Fe, Co, Ni, Cu, Ru, Rh, Pt, Au, FePt, Fe x Co 1 0 0 - x , NiAg and Cu-Ni. The millimeter-wave driven polyol process has been operated in both a batch process, with a reflux system driven in superheated mode and in a continuous system, where residences times at temperature are only a few seconds. Recently, a continuous, 2.45 GHz system has been used for the polyol process with significant advantages and is described briefly here.