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How is magnetic ordering in the 3d transition metals (Fe, Co, Ni) and the absence of magnetism in the elements just below them (Ru, Ir, Pd) related to the metal-insulator transition?
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Why are good metals bad superconductors and vice-versa?
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Discuss why semiconducting oxides of early transition metals such as TiO
2
and Nb
2
O
5
can be doped n-type but not p-type. Conversely, semiconducting late transition metal oxides such as NiO and Cu
2
O can be doped p-type but not n-type.