The heat pretreatment of Ni at 500-700 Deg gives a nonstoichiometric Ni oxide which shows metallic cond. and low activity for O evolution; at higher temps. (>700 Deg), a nonconducting NiO (p-type semiconductor) is formed. [on SciFinder (R)]
Mohammad Samizadeh Nikooytabalvandani
William Nicolas Duncan Esposito