Abstract
Impedance spectra for a new electrode material, undoped polycrystalline diamond films vacuum-annealed at 1775 to 1915 K, taken in indifferent electrolytes are analyzed. Regular changing of parameters of the equivalent circuit (constant-phase element, ohmic and faradaic resistances) with increasing anneal temperature is demonstrated. It is concluded that both the amount of a nondiamond conducting phase in the electrode bulk increased and its properties (first and foremost, the conductivity) changed with increasing anneal temperature.
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