or further ground to controlled particle size distribution powders. The spinel
formation reaction by EF is more complete than by CMO, and the spinel synthesized
is usually purer and more homogeneous than by CMO due to volatilization
of impurities. However, spinel powders prepared by EF have lower surface
reactivity than by CMO, thus requiring even higher temperatures to densify them
to aggregates or final products. Another problem with this technique is that
very high temperatures (22008C) are needed, so the process is highly energyintensive
and thus financially expensive.