Are network covalent bonds STRONGER than ionic bonds?
Network covalent bonds are generally stronger than ionic bonds. Of course, we are comparing apples with oranges.
Both network covalent solids, and ionic solids ARE non-molecular, and are therefore expected to have elevated melting points with respect to molecular species.
Let's compare the melting points of
And we could throw in another example:
This series at least demonstrates, that as the charge of the cation increases, the INTRAMOLECULAR ionic force becomes greater in magnitude, and this is manifested by the increased melting point.